+doc #17613 document persistence schema evolution
This commit is contained in:
Konrad Malawski
Konrad Malawski
parent
20352562e1
commit
270c566fea
31 changed files with 5334 additions and 19 deletions
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@ -178,3 +178,6 @@ strong {color: #0B5567; }
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.section-marker { position: absolute; width: 1em; margin-left: -1em; display: block; text-decoration: none; visibility: hidden; text-align: center; font-weight: normal; }
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p.caption { width: 80%; text-align: justify; font-size: 0.95em; font-style: italic; position: relative; left: 10%; }
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@ -20,6 +20,7 @@ prior deprecation.
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:maxdepth: 1
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../scala/persistence
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../scala/persistence-schema-evolution
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../dev/multi-node-testing
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../java/lambda-actors
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../java/lambda-fsm
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596
akka-docs/rst/images/persistence-detach-models.graffle
Normal file
596
akka-docs/rst/images/persistence-detach-models.graffle
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@ -0,0 +1,596 @@
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|
||||
</dict>
|
||||
<key>Font</key>
|
||||
<string>Helvetica</string>
|
||||
<key>Size</key>
|
||||
<real>12</real>
|
||||
</dict>
|
||||
<key>ID</key>
|
||||
<integer>55</integer>
|
||||
<key>Line</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>54</integer>
|
||||
<key>Position</key>
|
||||
<real>0.43243709206581116</real>
|
||||
<key>RotationType</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>shadow</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
|
||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 E}</string>
|
||||
</dict>
|
||||
<key>Wrap</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>54</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{187.09439086914062, 84.749998636153364}</string>
|
||||
<string>{113.18368016802742, 84.749998636153364}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{394.23969235661161, 48.612232334669955}, {20, 24}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>FitText</key>
|
||||
<string>YES</string>
|
||||
<key>Flow</key>
|
||||
<string>Resize</string>
|
||||
<key>FontInfo</key>
|
||||
<dict>
|
||||
<key>Color</key>
|
||||
<dict>
|
||||
<key>w</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
<key>Font</key>
|
||||
<string>Helvetica</string>
|
||||
<key>Size</key>
|
||||
<real>12</real>
|
||||
</dict>
|
||||
<key>ID</key>
|
||||
<integer>51</integer>
|
||||
<key>Line</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>50</integer>
|
||||
<key>Position</key>
|
||||
<real>0.46999874711036682</real>
|
||||
<key>RotationType</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>shadow</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 O}</string>
|
||||
</dict>
|
||||
<key>Wrap</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>50</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{444.03073772896801, 60.612232334669955}</string>
|
||||
<string>{359.36871337890625, 60.612232334669955}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{394.73969338491258, 70.74998911050038}, {19, 24}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>FitText</key>
|
||||
<string>YES</string>
|
||||
<key>Flow</key>
|
||||
<string>Resize</string>
|
||||
<key>FontInfo</key>
|
||||
<dict>
|
||||
<key>Color</key>
|
||||
<dict>
|
||||
<key>w</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
<key>Font</key>
|
||||
<string>Helvetica</string>
|
||||
<key>Size</key>
|
||||
<real>12</real>
|
||||
</dict>
|
||||
<key>ID</key>
|
||||
<integer>49</integer>
|
||||
<key>Line</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>48</integer>
|
||||
<key>Position</key>
|
||||
<real>0.46999874711036682</real>
|
||||
<key>RotationType</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>shadow</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 E}</string>
|
||||
</dict>
|
||||
<key>Wrap</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>48</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{444.03073966915389, 82.74998911050038}</string>
|
||||
<string>{359.36871337890625, 82.74998911050038}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{444.03075265173618, 27.964275753223664}, {54, 79.897956848144531}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>10</integer>
|
||||
<key>Magnets</key>
|
||||
<array>
|
||||
<string>{0, 1}</string>
|
||||
<string>{0, -1}</string>
|
||||
<string>{1, 0}</string>
|
||||
<string>{-1, 0}</string>
|
||||
</array>
|
||||
<key>Shape</key>
|
||||
<string>Cylinder</string>
|
||||
<key>Style</key>
|
||||
<dict/>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\qc
|
||||
|
||||
\f0\fs20 \cf0 Journal}</string>
|
||||
<key>VerticalPad</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{187.09438968957969, 27.964285076097411}, {57.586738586425781, 79.897956848144531}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>13</integer>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
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||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 Event\
|
||||
Adapter}</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{9.9872450012231155, 51.61224533855227}, {102.19643402099609, 45.275508880615234}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>1</integer>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
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||||
{\colortbl;\red255\green255\blue255;}
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||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 PersistentActor}</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</array>
|
||||
<key>GridInfo</key>
|
||||
<dict/>
|
||||
<key>GuidesLocked</key>
|
||||
<string>NO</string>
|
||||
<key>GuidesVisible</key>
|
||||
<string>YES</string>
|
||||
<key>HPages</key>
|
||||
<integer>1</integer>
|
||||
<key>ImageCounter</key>
|
||||
<integer>1</integer>
|
||||
<key>KeepToScale</key>
|
||||
<false/>
|
||||
<key>Layers</key>
|
||||
<array>
|
||||
<dict>
|
||||
<key>Lock</key>
|
||||
<string>NO</string>
|
||||
<key>Name</key>
|
||||
<string>Layer 1</string>
|
||||
<key>Print</key>
|
||||
<string>YES</string>
|
||||
<key>View</key>
|
||||
<string>YES</string>
|
||||
</dict>
|
||||
</array>
|
||||
<key>LayoutInfo</key>
|
||||
<dict>
|
||||
<key>Animate</key>
|
||||
<string>NO</string>
|
||||
<key>circoMinDist</key>
|
||||
<real>18</real>
|
||||
<key>circoSeparation</key>
|
||||
<real>0.0</real>
|
||||
<key>layoutEngine</key>
|
||||
<string>dot</string>
|
||||
<key>neatoSeparation</key>
|
||||
<real>0.0</real>
|
||||
<key>twopiSeparation</key>
|
||||
<real>0.0</real>
|
||||
</dict>
|
||||
<key>LinksVisible</key>
|
||||
<string>NO</string>
|
||||
<key>MagnetsVisible</key>
|
||||
<string>NO</string>
|
||||
<key>MasterSheets</key>
|
||||
<array/>
|
||||
<key>ModificationDate</key>
|
||||
<string>2015-07-24 11:04:44 +0000</string>
|
||||
<key>Modifier</key>
|
||||
<string>Konrad Malawski</string>
|
||||
<key>NotesVisible</key>
|
||||
<string>NO</string>
|
||||
<key>Orientation</key>
|
||||
<integer>2</integer>
|
||||
<key>OriginVisible</key>
|
||||
<string>NO</string>
|
||||
<key>PageBreaks</key>
|
||||
<string>YES</string>
|
||||
<key>PrintInfo</key>
|
||||
<dict>
|
||||
<key>NSBottomMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>41</string>
|
||||
</array>
|
||||
<key>NSHorizonalPagination</key>
|
||||
<array>
|
||||
<string>coded</string>
|
||||
<string>BAtzdHJlYW10eXBlZIHoA4QBQISEhAhOU051bWJlcgCEhAdOU1ZhbHVlAISECE5TT2JqZWN0AIWEASqEhAFxlwCG</string>
|
||||
</array>
|
||||
<key>NSLeftMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>18</string>
|
||||
</array>
|
||||
<key>NSPaperSize</key>
|
||||
<array>
|
||||
<string>size</string>
|
||||
<string>{595.28997802734375, 841.8900146484375}</string>
|
||||
</array>
|
||||
<key>NSPrintReverseOrientation</key>
|
||||
<array>
|
||||
<string>int</string>
|
||||
<string>0</string>
|
||||
</array>
|
||||
<key>NSRightMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>18</string>
|
||||
</array>
|
||||
<key>NSTopMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>18</string>
|
||||
</array>
|
||||
</dict>
|
||||
<key>PrintOnePage</key>
|
||||
<false/>
|
||||
<key>ReadOnly</key>
|
||||
<string>NO</string>
|
||||
<key>RowAlign</key>
|
||||
<integer>1</integer>
|
||||
<key>RowSpacing</key>
|
||||
<real>36</real>
|
||||
<key>SheetTitle</key>
|
||||
<string>Canvas 1</string>
|
||||
<key>SmartAlignmentGuidesActive</key>
|
||||
<string>YES</string>
|
||||
<key>SmartDistanceGuidesActive</key>
|
||||
<string>YES</string>
|
||||
<key>UniqueID</key>
|
||||
<integer>1</integer>
|
||||
<key>UseEntirePage</key>
|
||||
<false/>
|
||||
<key>VPages</key>
|
||||
<integer>1</integer>
|
||||
<key>WindowInfo</key>
|
||||
<dict>
|
||||
<key>CurrentSheet</key>
|
||||
<integer>0</integer>
|
||||
<key>ExpandedCanvases</key>
|
||||
<array>
|
||||
<dict>
|
||||
<key>name</key>
|
||||
<string>Canvas 1</string>
|
||||
</dict>
|
||||
</array>
|
||||
<key>FitInWindow</key>
|
||||
<true/>
|
||||
<key>Frame</key>
|
||||
<string>{{271, 0}, {1920, 1417}}</string>
|
||||
<key>ListView</key>
|
||||
<true/>
|
||||
<key>OutlineWidth</key>
|
||||
<integer>142</integer>
|
||||
<key>RightSidebar</key>
|
||||
<false/>
|
||||
<key>ShowRuler</key>
|
||||
<true/>
|
||||
<key>Sidebar</key>
|
||||
<true/>
|
||||
<key>SidebarWidth</key>
|
||||
<integer>120</integer>
|
||||
<key>VisibleRegion</key>
|
||||
<string>{{-268, 0}, {1096.199978169217, 782.99998440658374}}</string>
|
||||
<key>Zoom</key>
|
||||
<real>1.6283525228500366</real>
|
||||
<key>ZoomValues</key>
|
||||
<array>
|
||||
<array>
|
||||
<string>Canvas 1</string>
|
||||
<real>0.0</real>
|
||||
<real>1</real>
|
||||
</array>
|
||||
</array>
|
||||
</dict>
|
||||
</dict>
|
||||
</plist>
|
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BIN
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
BIN
akka-docs/rst/images/persistence-manual-rename.png
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akka-docs/rst/images/persistence-manual-rename.png
Normal file
Binary file not shown.
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After Width: | Height: | Size: 13 KiB |
679
akka-docs/rst/images/persistence-serializer-rename.graffle
Normal file
679
akka-docs/rst/images/persistence-serializer-rename.graffle
Normal file
|
|
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|||
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|
||||
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||||
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|
||||
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||||
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|
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|
||||
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||||
<key>Draws</key>
|
||||
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|
||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<integer>8</integer>
|
||||
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|
||||
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|
||||
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||||
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|
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||||
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||||
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|
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||||
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|
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|
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|
||||
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|
||||
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|
||||
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|
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|
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||||
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|
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|
||||
<key>ID</key>
|
||||
<integer>67</integer>
|
||||
<key>Position</key>
|
||||
<real>0.43243709206581116</real>
|
||||
<key>RotationType</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>shadow</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
|
||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 A.seatNr}</string>
|
||||
</dict>
|
||||
<key>Wrap</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>67</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{208.32634070768711, 136.35918075415361}</string>
|
||||
<string>{116.62739570856519, 136.62100608778607}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{283.60994305394411, 123.36436973735323}, {57, 24}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>FitText</key>
|
||||
<string>YES</string>
|
||||
<key>Flow</key>
|
||||
<string>Resize</string>
|
||||
<key>FontInfo</key>
|
||||
<dict>
|
||||
<key>Color</key>
|
||||
<dict>
|
||||
<key>w</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
<key>Font</key>
|
||||
<string>Helvetica</string>
|
||||
<key>Size</key>
|
||||
<real>12</real>
|
||||
</dict>
|
||||
<key>ID</key>
|
||||
<integer>66</integer>
|
||||
<key>Line</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>65</integer>
|
||||
<key>Position</key>
|
||||
<real>0.46274498105049133</real>
|
||||
<key>RotationType</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>shadow</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 A.seatNr}</string>
|
||||
</dict>
|
||||
<key>Wrap</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>65</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{351.286868282196, 135.36436973735323}</string>
|
||||
<string>{266.6248419919483, 135.36436973735323}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>Head</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>61</integer>
|
||||
</dict>
|
||||
<key>ID</key>
|
||||
<integer>63</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{237.119717968369, 50.243527827595514}</string>
|
||||
<string>{237.119717968369, 79.335292523504918}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Tail</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>56</integer>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{183.40465009683402, 20.265881949346891}, {107.43011379637244, 29.477645874023438}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>56</integer>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 Protocol\
|
||||
IDL}</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{139.9605523938219, 107.01448443883029}, {57, 24}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>FitText</key>
|
||||
<string>YES</string>
|
||||
<key>Flow</key>
|
||||
<string>Resize</string>
|
||||
<key>FontInfo</key>
|
||||
<dict>
|
||||
<key>Color</key>
|
||||
<dict>
|
||||
<key>w</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
<key>Font</key>
|
||||
<string>Helvetica</string>
|
||||
<key>Size</key>
|
||||
<real>12</real>
|
||||
</dict>
|
||||
<key>ID</key>
|
||||
<integer>55</integer>
|
||||
<key>Line</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>54</integer>
|
||||
<key>Position</key>
|
||||
<real>0.43243709206581116</real>
|
||||
<key>RotationType</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>shadow</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
|
||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 A.seatNr}</string>
|
||||
</dict>
|
||||
<key>Wrap</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>54</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{208.11457852770752, 119.3142831598844}</string>
|
||||
<string>{116.41563118613487, 118.62100608778607}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{287.89817853151374, 96.152605214922048}, {48, 24}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>FitText</key>
|
||||
<string>YES</string>
|
||||
<key>Flow</key>
|
||||
<string>Resize</string>
|
||||
<key>FontInfo</key>
|
||||
<dict>
|
||||
<key>Color</key>
|
||||
<dict>
|
||||
<key>w</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
<key>Font</key>
|
||||
<string>Helvetica</string>
|
||||
<key>Size</key>
|
||||
<real>12</real>
|
||||
</dict>
|
||||
<key>ID</key>
|
||||
<integer>60</integer>
|
||||
<key>Line</key>
|
||||
<dict>
|
||||
<key>ID</key>
|
||||
<integer>59</integer>
|
||||
<key>Position</key>
|
||||
<real>0.46274498105049133</real>
|
||||
<key>RotationType</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>shadow</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>Draws</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 A.code}</string>
|
||||
</dict>
|
||||
<key>Wrap</key>
|
||||
<string>NO</string>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Class</key>
|
||||
<string>LineGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>59</integer>
|
||||
<key>Points</key>
|
||||
<array>
|
||||
<string>{351.07510375976562, 108.15260521492205}</string>
|
||||
<string>{266.41307746951793, 108.15260521492205}</string>
|
||||
</array>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>stroke</key>
|
||||
<dict>
|
||||
<key>HeadArrow</key>
|
||||
<string>FilledArrow</string>
|
||||
<key>Legacy</key>
|
||||
<true/>
|
||||
<key>LineType</key>
|
||||
<integer>1</integer>
|
||||
<key>TailArrow</key>
|
||||
<string>0</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{351.07510558931313, 79.835293707727061}, {54, 79.897956848144531}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>10</integer>
|
||||
<key>Magnets</key>
|
||||
<array>
|
||||
<string>{0, 1}</string>
|
||||
<string>{0, -1}</string>
|
||||
<string>{1, 0}</string>
|
||||
<string>{-1, 0}</string>
|
||||
</array>
|
||||
<key>Shape</key>
|
||||
<string>Cylinder</string>
|
||||
<key>Style</key>
|
||||
<dict/>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\qc
|
||||
|
||||
\f0\fs20 \cf0 Journal}</string>
|
||||
<key>VerticalPad</key>
|
||||
<integer>0</integer>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{208.32634070768711, 79.835292527730118}, {57.586738586425781, 79.897956848144531}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>61</integer>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
|
||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs22 \cf0 Serializer}</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{13.219196019330578, 103.48325279018498}, {102.19643402099609, 45.275508880615234}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>1</integer>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
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||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 PersistentActor}</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</array>
|
||||
<key>GridInfo</key>
|
||||
<dict/>
|
||||
<key>GuidesLocked</key>
|
||||
<string>NO</string>
|
||||
<key>GuidesVisible</key>
|
||||
<string>YES</string>
|
||||
<key>HPages</key>
|
||||
<integer>1</integer>
|
||||
<key>ImageCounter</key>
|
||||
<integer>1</integer>
|
||||
<key>KeepToScale</key>
|
||||
<false/>
|
||||
<key>Layers</key>
|
||||
<array>
|
||||
<dict>
|
||||
<key>Lock</key>
|
||||
<string>NO</string>
|
||||
<key>Name</key>
|
||||
<string>Layer 1</string>
|
||||
<key>Print</key>
|
||||
<string>YES</string>
|
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|
||||
<string>{{34.880753908867661, 126.83801682660956}, {73.86474609375, 16.645408630371094}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>69</integer>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>fill</key>
|
||||
<dict>
|
||||
<key>Color</key>
|
||||
<dict>
|
||||
<key>b</key>
|
||||
<string>1</string>
|
||||
<key>g</key>
|
||||
<string>0.992157</string>
|
||||
<key>r</key>
|
||||
<string>0.796078</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
|
||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural\qc
|
||||
|
||||
\f0\fs24 \cf0 seqNr}</string>
|
||||
</dict>
|
||||
</dict>
|
||||
<dict>
|
||||
<key>Bounds</key>
|
||||
<string>{{27.303571669521091, 106.53061334638005}, {241.34693908691406, 131.16581726074219}}</string>
|
||||
<key>Class</key>
|
||||
<string>ShapedGraphic</string>
|
||||
<key>ID</key>
|
||||
<integer>75</integer>
|
||||
<key>Shape</key>
|
||||
<string>Rectangle</string>
|
||||
<key>Style</key>
|
||||
<dict>
|
||||
<key>fill</key>
|
||||
<dict>
|
||||
<key>Color</key>
|
||||
<dict>
|
||||
<key>b</key>
|
||||
<string>0.920143</string>
|
||||
<key>g</key>
|
||||
<string>0.851771</string>
|
||||
<key>r</key>
|
||||
<string>0.237451</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</dict>
|
||||
<key>Text</key>
|
||||
<dict>
|
||||
<key>Align</key>
|
||||
<integer>0</integer>
|
||||
<key>Text</key>
|
||||
<string>{\rtf1\ansi\ansicpg1252\cocoartf1348\cocoasubrtf170
|
||||
\cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
|
||||
{\colortbl;\red255\green255\blue255;}
|
||||
\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\pardirnatural
|
||||
|
||||
\f0\fs24 \cf0 PersistentMessage\
|
||||
\
|
||||
\
|
||||
\
|
||||
\
|
||||
\
|
||||
\
|
||||
\
|
||||
}</string>
|
||||
</dict>
|
||||
</dict>
|
||||
</array>
|
||||
<key>GridInfo</key>
|
||||
<dict/>
|
||||
<key>GuidesLocked</key>
|
||||
<string>NO</string>
|
||||
<key>GuidesVisible</key>
|
||||
<string>YES</string>
|
||||
<key>HPages</key>
|
||||
<integer>1</integer>
|
||||
<key>ImageCounter</key>
|
||||
<integer>1</integer>
|
||||
<key>KeepToScale</key>
|
||||
<false/>
|
||||
<key>Layers</key>
|
||||
<array>
|
||||
<dict>
|
||||
<key>Lock</key>
|
||||
<string>NO</string>
|
||||
<key>Name</key>
|
||||
<string>Layer 1</string>
|
||||
<key>Print</key>
|
||||
<string>YES</string>
|
||||
<key>View</key>
|
||||
<string>YES</string>
|
||||
</dict>
|
||||
</array>
|
||||
<key>LayoutInfo</key>
|
||||
<dict>
|
||||
<key>Animate</key>
|
||||
<string>NO</string>
|
||||
<key>circoMinDist</key>
|
||||
<real>18</real>
|
||||
<key>circoSeparation</key>
|
||||
<real>0.0</real>
|
||||
<key>layoutEngine</key>
|
||||
<string>dot</string>
|
||||
<key>neatoSeparation</key>
|
||||
<real>0.0</real>
|
||||
<key>twopiSeparation</key>
|
||||
<real>0.0</real>
|
||||
</dict>
|
||||
<key>LinksVisible</key>
|
||||
<string>NO</string>
|
||||
<key>MagnetsVisible</key>
|
||||
<string>NO</string>
|
||||
<key>MasterSheets</key>
|
||||
<array/>
|
||||
<key>ModificationDate</key>
|
||||
<string>2015-07-23 12:16:09 +0000</string>
|
||||
<key>Modifier</key>
|
||||
<string>Konrad Malawski</string>
|
||||
<key>NotesVisible</key>
|
||||
<string>NO</string>
|
||||
<key>Orientation</key>
|
||||
<integer>2</integer>
|
||||
<key>OriginVisible</key>
|
||||
<string>NO</string>
|
||||
<key>PageBreaks</key>
|
||||
<string>YES</string>
|
||||
<key>PrintInfo</key>
|
||||
<dict>
|
||||
<key>NSBottomMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>41</string>
|
||||
</array>
|
||||
<key>NSHorizonalPagination</key>
|
||||
<array>
|
||||
<string>coded</string>
|
||||
<string>BAtzdHJlYW10eXBlZIHoA4QBQISEhAhOU051bWJlcgCEhAdOU1ZhbHVlAISECE5TT2JqZWN0AIWEASqEhAFxlwCG</string>
|
||||
</array>
|
||||
<key>NSLeftMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>18</string>
|
||||
</array>
|
||||
<key>NSPaperSize</key>
|
||||
<array>
|
||||
<string>size</string>
|
||||
<string>{595.28997802734375, 841.8900146484375}</string>
|
||||
</array>
|
||||
<key>NSPrintReverseOrientation</key>
|
||||
<array>
|
||||
<string>int</string>
|
||||
<string>0</string>
|
||||
</array>
|
||||
<key>NSRightMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>18</string>
|
||||
</array>
|
||||
<key>NSTopMargin</key>
|
||||
<array>
|
||||
<string>float</string>
|
||||
<string>18</string>
|
||||
</array>
|
||||
</dict>
|
||||
<key>PrintOnePage</key>
|
||||
<false/>
|
||||
<key>ReadOnly</key>
|
||||
<string>NO</string>
|
||||
<key>RowAlign</key>
|
||||
<integer>1</integer>
|
||||
<key>RowSpacing</key>
|
||||
<real>36</real>
|
||||
<key>SheetTitle</key>
|
||||
<string>Canvas 1</string>
|
||||
<key>SmartAlignmentGuidesActive</key>
|
||||
<string>YES</string>
|
||||
<key>SmartDistanceGuidesActive</key>
|
||||
<string>YES</string>
|
||||
<key>UniqueID</key>
|
||||
<integer>1</integer>
|
||||
<key>UseEntirePage</key>
|
||||
<false/>
|
||||
<key>VPages</key>
|
||||
<integer>1</integer>
|
||||
<key>WindowInfo</key>
|
||||
<dict>
|
||||
<key>CurrentSheet</key>
|
||||
<integer>0</integer>
|
||||
<key>ExpandedCanvases</key>
|
||||
<array>
|
||||
<dict>
|
||||
<key>name</key>
|
||||
<string>Canvas 1</string>
|
||||
</dict>
|
||||
</array>
|
||||
<key>FitInWindow</key>
|
||||
<true/>
|
||||
<key>Frame</key>
|
||||
<string>{{268, 99}, {1776, 1318}}</string>
|
||||
<key>ListView</key>
|
||||
<true/>
|
||||
<key>OutlineWidth</key>
|
||||
<integer>142</integer>
|
||||
<key>RightSidebar</key>
|
||||
<false/>
|
||||
<key>ShowRuler</key>
|
||||
<true/>
|
||||
<key>Sidebar</key>
|
||||
<true/>
|
||||
<key>SidebarWidth</key>
|
||||
<integer>120</integer>
|
||||
<key>VisibleRegion</key>
|
||||
<string>{{-266, 0}, {1092.6046031338085, 783.0000080958921}}</string>
|
||||
<key>Zoom</key>
|
||||
<real>1.5019156932830811</real>
|
||||
<key>ZoomValues</key>
|
||||
<array>
|
||||
<array>
|
||||
<string>Canvas 1</string>
|
||||
<real>0.0</real>
|
||||
<real>1</real>
|
||||
</array>
|
||||
</array>
|
||||
</dict>
|
||||
</dict>
|
||||
</plist>
|
||||
BIN
akka-docs/rst/images/persistent-message-envelope.png
Normal file
BIN
akka-docs/rst/images/persistent-message-envelope.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 13 KiB |
3
akka-docs/rst/images/persistent-message-envelope.svg
Normal file
3
akka-docs/rst/images/persistent-message-envelope.svg
Normal file
File diff suppressed because one or more lines are too long
|
After Width: | Height: | Size: 5.7 KiB |
|
|
@ -8,6 +8,8 @@ import akka.japi.Procedure;
|
|||
import akka.japi.pf.ReceiveBuilder;
|
||||
import akka.pattern.BackoffSupervisor;
|
||||
import akka.persistence.*;
|
||||
import akka.persistence.journal.EventAdapter;
|
||||
import akka.persistence.journal.EventSeq;
|
||||
import scala.Option;
|
||||
import scala.concurrent.duration.Duration;
|
||||
import scala.PartialFunction;
|
||||
|
|
|
|||
|
|
@ -586,6 +586,46 @@ not accept more messages and it will throw ``AtLeastOnceDelivery.MaxUnconfirmedM
|
|||
The default value can be configured with the ``akka.persistence.at-least-once-delivery.max-unconfirmed-messages``
|
||||
configuration key. The method can be overridden by implementation classes to return non-default values.
|
||||
|
||||
.. _event-adapters-lambda:
|
||||
|
||||
Event Adapters
|
||||
==============
|
||||
|
||||
In long running projects using event sourcing sometimes the need arises to detach the data model from the domain model
|
||||
completely.
|
||||
|
||||
Event Adapters help in situations where:
|
||||
|
||||
- **Version Migrations** – existing events stored in *Version 1* should be "upcasted" to a new *Version 2* representation,
|
||||
and the process of doing so involves actual code, not just changes on the serialization layer. For these scenarios
|
||||
the ``toJournal`` function is usually an identity function, however the ``fromJournal`` is implemented as
|
||||
``v1.Event=>v2.Event``, performing the neccessary mapping inside the fromJournal method.
|
||||
This technique is sometimes refered to as "upcasting" in other CQRS libraries.
|
||||
- **Separating Domain and Data models** – thanks to EventAdapters it is possible to completely separate the domain model
|
||||
from the model used to persist data in the Journals. For example one may want to use case classes in the
|
||||
domain model, however persist their protocol-buffer (or any other binary serialization format) counter-parts to the Journal.
|
||||
A simple ``toJournal:MyModel=>MyDataModel`` and ``fromJournal:MyDataModel=>MyModel`` adapter can be used to implement this feature.
|
||||
- **Journal Specialized Data Types** – exposing data types understood by the underlying Journal, for example for data stores which
|
||||
understand JSON it is possible to write an EventAdapter ``toJournal:Any=>JSON`` such that the Journal can *directly* store the
|
||||
json instead of serializing the object to its binary representation.
|
||||
|
||||
Implementing an EventAdapter is rather stright forward:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceEventAdapterDocTest.java#identity-event-adapter
|
||||
|
||||
Then in order for it to be used on events coming to and from the journal you must bind it using the below configuration syntax:
|
||||
|
||||
.. includecode:: ../scala/code/docs/persistence/PersistenceEventAdapterDocSpec.scala#event-adapters-config
|
||||
|
||||
It is possible to bind multiple adapters to one class *for recovery*, in which case the ``fromJournal`` methods of all
|
||||
bound adapters will be applied to a given matching event (in order of definition in the configuration). Since each adapter may
|
||||
return from ``0`` to ``n`` adapted events (called as ``EventSeq``), each adapter can investigate the event and if it should
|
||||
indeed adapt it return the adapted event(s) for it, other adapters which do not have anything to contribute during this
|
||||
adaptation simply return ``EventSeq.empty``. The adapted events are then delivered in-order to the ``PersistentActor`` during replay.
|
||||
|
||||
.. note::
|
||||
For more advanced schema evolution techniques refer to the :ref:`persistence-schema-evolution-scala` documentation.
|
||||
|
||||
.. _persistent-fsm-java-lambda:
|
||||
|
||||
Persistent FSM
|
||||
|
|
@ -794,6 +834,8 @@ it must add
|
|||
|
||||
to the application configuration. If not specified, a default serializer is used.
|
||||
|
||||
For more advanced schema evolution techniques refer to the :ref:`persistence-schema-evolution-scala` documentation.
|
||||
|
||||
Testing
|
||||
=======
|
||||
|
||||
|
|
|
|||
|
|
@ -601,10 +601,6 @@ configuration key. The method can be overridden by implementation classes to ret
|
|||
Event Adapters
|
||||
==============
|
||||
|
||||
.. note::
|
||||
|
||||
Complete documentation featuring use-cases and implementation examples for this feature will follow shortly.
|
||||
|
||||
In long running projects using event sourcing sometimes the need arises to detach the data model from the domain model
|
||||
completely.
|
||||
|
||||
|
|
@ -638,11 +634,7 @@ indeed adapt it return the adapted event(s) for it, other adapters which do not
|
|||
adaptation simply return ``EventSeq.empty``. The adapted events are then delivered in-order to the ``PersistentActor`` during replay.
|
||||
|
||||
.. note::
|
||||
More advanced techniques utilising advanced binary serialization formats such as protocol buffers or kryo / thrift / avro
|
||||
will be documented very soon. These schema evolutions often may need to reach into the serialization layer, however
|
||||
are much more powerful in terms of flexibly removing unused/deprecated classes from your classpath etc.
|
||||
|
||||
|
||||
For more advanced schema evolution techniques refer to the :ref:`persistence-schema-evolution-scala` documentation.
|
||||
|
||||
Storage plugins
|
||||
===============
|
||||
|
|
@ -833,6 +825,8 @@ it must add
|
|||
|
||||
to the application configuration. If not specified, a default serializer is used.
|
||||
|
||||
For more advanced schema evolution techniques refer to the :ref:`persistence-schema-evolution-scala` documentation.
|
||||
|
||||
Testing
|
||||
=======
|
||||
|
||||
|
|
|
|||
|
|
@ -111,11 +111,13 @@ bytes to different objects.
|
|||
Then you only need to fill in the blanks, bind it to a name in your :ref:`configuration` and then
|
||||
list which classes that should be serialized using it.
|
||||
|
||||
.. _string-manifest-serializer-java:
|
||||
|
||||
Serializer with String Manifest
|
||||
-------------------------------
|
||||
|
||||
The ``Serializer`` illustrated above supports a class based manifest (type hint).
|
||||
For serialization of data that need to evolve over time the `SerializerWithStringManifest`
|
||||
For serialization of data that need to evolve over time the ``SerializerWithStringManifest``
|
||||
is recommended instead of ``Serializer`` because the manifest (type hint) is a ``String``
|
||||
instead of a ``Class``. That means that the class can be moved/removed and the serializer
|
||||
can still deserialize old data by matching on the ``String``. This is especially useful
|
||||
|
|
|
|||
|
|
@ -0,0 +1,407 @@
|
|||
/*
|
||||
* Copyright (C) 2009-2015 Typesafe Inc. <http://www.typesafe.com>
|
||||
*/
|
||||
|
||||
package docs.persistence
|
||||
|
||||
import scala.language.reflectiveCalls
|
||||
import java.nio.charset.Charset
|
||||
|
||||
import akka.actor.ActorSystem
|
||||
import akka.persistence.journal.{ EventAdapter, EventSeq }
|
||||
import akka.serialization.{ SerializationExtension, SerializerWithStringManifest }
|
||||
import akka.testkit.TestKit
|
||||
import com.typesafe.config._
|
||||
import org.scalatest.WordSpec
|
||||
import spray.json.JsObject
|
||||
|
||||
import scala.concurrent.duration._
|
||||
|
||||
class PersistenceSchemaEvolutionDocSpec extends WordSpec {
|
||||
|
||||
val customSerializerConfig =
|
||||
"""
|
||||
//#custom-serializer-config
|
||||
akka.actor {
|
||||
serializers {
|
||||
my-payload = "docs.persistence.MyPayloadSerializer"
|
||||
my-snapshot = "docs.persistence.MySnapshotSerializer"
|
||||
}
|
||||
serialization-bindings {
|
||||
"docs.persistence.MyPayload" = my-payload
|
||||
"docs.persistence.MySnapshot" = my-snapshot
|
||||
}
|
||||
}
|
||||
//#custom-serializer-config
|
||||
"""
|
||||
|
||||
val system = ActorSystem("PersistenceSchemaEvolutionDocSpec", ConfigFactory.parseString(customSerializerConfig))
|
||||
try {
|
||||
SerializationExtension(system)
|
||||
} finally {
|
||||
TestKit.shutdownActorSystem(system, 10.seconds, false)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
class ProtobufReadOptional {
|
||||
object proto {
|
||||
class SeatReserved {
|
||||
def hasSeatType = false
|
||||
def getLetter = ""
|
||||
def getRow = 1
|
||||
def getSeatType = ""
|
||||
}
|
||||
object SeatReserved {
|
||||
def newBuilder = new {
|
||||
def setCode(any: Any): this.type = this
|
||||
def setRow(any: Any): this.type = this
|
||||
def setSeatType(any: Any): this.type = this
|
||||
def build() = new {
|
||||
def toByteArray: Array[Byte] = Array()
|
||||
}
|
||||
}
|
||||
def parseFrom(any: Any) = new SeatReserved
|
||||
}
|
||||
}
|
||||
|
||||
//#protobuf-read-optional-model
|
||||
sealed abstract class SeatType { def code: String }
|
||||
object SeatType {
|
||||
def fromString(s: String) = s match {
|
||||
case Window.code => Window
|
||||
case Aisle.code => Aisle
|
||||
case Other.code => Other
|
||||
case _ => Unknown
|
||||
}
|
||||
case object Window extends SeatType { override val code = "W" }
|
||||
case object Aisle extends SeatType { override val code = "A" }
|
||||
case object Other extends SeatType { override val code = "O" }
|
||||
case object Unknown extends SeatType { override val code = "" }
|
||||
|
||||
}
|
||||
|
||||
case class SeatReserved(letter: String, row: Int, seatType: SeatType)
|
||||
//#protobuf-read-optional-model
|
||||
|
||||
val protoIDL = """
|
||||
//#protobuf-read-optional-proto
|
||||
// FlightAppModels.proto
|
||||
option java_package = "docs.persistence.proto";
|
||||
option optimize_for = SPEED;
|
||||
|
||||
message SeatReserved {
|
||||
required string letter = 1;
|
||||
required string row = 2;
|
||||
optional string seatType = 3; // the new field
|
||||
}
|
||||
//#protobuf-read-optional-proto
|
||||
"""
|
||||
|
||||
//#protobuf-read-optional
|
||||
/**
|
||||
* Example serializer impl which uses protocol buffers generated classes (proto.*)
|
||||
* to perform the to/from binary marshalling.
|
||||
*/
|
||||
class AddedFieldsSerializerWithProtobuf extends SerializerWithStringManifest {
|
||||
override def identifier = 67876
|
||||
|
||||
final val SeatReservedManifest = classOf[SeatReserved].getName
|
||||
|
||||
override def manifest(o: AnyRef): String = o.getClass.getName
|
||||
|
||||
override def fromBinary(bytes: Array[Byte], manifest: String): AnyRef =
|
||||
manifest match {
|
||||
case SeatReservedManifest =>
|
||||
seatReserved(proto.SeatReserved.parseFrom(bytes)) // use generated protobuf serializer
|
||||
case _ =>
|
||||
throw new IllegalArgumentException("Unable to handle manifest: " + manifest)
|
||||
}
|
||||
|
||||
override def toBinary(o: AnyRef): Array[Byte] = o match {
|
||||
case s: SeatReserved =>
|
||||
proto.SeatReserved.newBuilder
|
||||
.setCode(s.letter)
|
||||
.setSeatType(s.seatType)
|
||||
.build().toByteArray
|
||||
}
|
||||
|
||||
// -- fromBinary helpers --
|
||||
|
||||
private def seatReserved(p: proto.SeatReserved): SeatReserved =
|
||||
SeatReserved(p.getLetter, p.getRow, seatType(p))
|
||||
|
||||
// handle missing field by assigning "Unknown" value
|
||||
private def seatType(p: proto.SeatReserved): SeatType =
|
||||
if (p.hasSeatType) SeatType.fromString(p.getSeatType) else SeatType.Unknown
|
||||
|
||||
}
|
||||
//#protobuf-read-optional
|
||||
}
|
||||
|
||||
class ProtoBufRename {
|
||||
val protoIDL = """
|
||||
//#protobuf-rename-proto
|
||||
// protobuf message definition, BEFORE:
|
||||
message SeatReserved {
|
||||
required string code = 1;
|
||||
}
|
||||
|
||||
// protobuf message definition, AFTER:
|
||||
message SeatReserved {
|
||||
required string seatNr = 1; // field renamed, id remains the same
|
||||
}
|
||||
//#protobuf-rename-proto
|
||||
"""
|
||||
}
|
||||
|
||||
class RenamePlainJson {
|
||||
//#rename-plain-json
|
||||
class JsonRenamedFieldAdapter extends EventAdapter {
|
||||
val marshaller = new ExampleJsonMarshaller
|
||||
|
||||
val V1 = "v1"
|
||||
val V2 = "v2"
|
||||
|
||||
// this could be done independently for each event type
|
||||
override def manifest(event: Any): String = "v2"
|
||||
|
||||
override def toJournal(event: Any): JsObject =
|
||||
marshaller.toJson(event)
|
||||
|
||||
override def fromJournal(event: Any, manifest: String): EventSeq = event match {
|
||||
case json: JsObject => EventSeq(marshaller.fromJson(manifest match {
|
||||
case V1 => rename(json, "code" -> "seatNr")
|
||||
case V2 => json // pass-through
|
||||
case unknown => throw new IllegalArgumentException(s"Unknown manifest: $unknown")
|
||||
}))
|
||||
case _ =>
|
||||
val c = event.getClass
|
||||
throw new IllegalArgumentException("Can only work with JSON, was: %s".format(c))
|
||||
}
|
||||
|
||||
def rename(json: JsObject, fromTo: (String, String)): JsObject = {
|
||||
val value = json.fields(fromTo._1)
|
||||
val withoutOld = json.fields - fromTo._1
|
||||
JsObject(withoutOld + (fromTo._2 -> value))
|
||||
}
|
||||
|
||||
}
|
||||
//#rename-plain-json
|
||||
}
|
||||
|
||||
class SimplestCustomSerializer {
|
||||
|
||||
//#simplest-custom-serializer-model
|
||||
final case class Person(name: String, surname: String)
|
||||
//#simplest-custom-serializer-model
|
||||
|
||||
//#simplest-custom-serializer
|
||||
/**
|
||||
* Simplest possible serializer, uses a string representation of the Person class.
|
||||
*
|
||||
* Usually a serializer like this would use a library like:
|
||||
* protobuf, kryo, avro, cap'n proto, flatbuffers, SBE or some other dedicated serializer backend
|
||||
* to perform the actual to/from bytes marshalling.
|
||||
*/
|
||||
class SimplestPossiblePersonSerializer extends SerializerWithStringManifest {
|
||||
val Utf8 = Charset.forName("UTF-8")
|
||||
|
||||
val PersonManifest = classOf[Person].getName
|
||||
|
||||
// unique identifier of the serializer
|
||||
def identifier = 1234567
|
||||
|
||||
// extract manifest to be stored together with serialized object
|
||||
override def manifest(o: AnyRef): String = o.getClass.getName
|
||||
|
||||
// serialize the object
|
||||
def toBinary(obj: AnyRef): Array[Byte] = obj match {
|
||||
case p: Person => s"""${p.name}|${p.surname}""".getBytes(Utf8)
|
||||
case _ => throw new IllegalArgumentException(
|
||||
s"Unable to serialize to bytes, clazz was: ${obj.getClass}!")
|
||||
}
|
||||
|
||||
// deserialize the object, using the manifest to indicate which logic to apply
|
||||
def fromBinary(bytes: Array[Byte], clazz: String): AnyRef = clazz match {
|
||||
case PersonManifest =>
|
||||
val nameAndSurname = new String(bytes, Utf8)
|
||||
val Array(name, surname) = nameAndSurname.split("[|]")
|
||||
Person(name, surname)
|
||||
case _ => throw new IllegalArgumentException(
|
||||
s"Unable to deserialize from bytes, clazz was: $clazz! Bytes length: ${bytes.length}")
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
//#simplest-custom-serializer
|
||||
}
|
||||
|
||||
class PersonSerializerSettingsBox {
|
||||
val PersonSerializerSettings = """
|
||||
//#simplest-custom-serializer-config
|
||||
# application.conf
|
||||
akka {
|
||||
actor {
|
||||
serializers {
|
||||
person = "docs.persistence.SimplestPossiblePersonSerializer"
|
||||
}
|
||||
|
||||
serialization-bindings {
|
||||
"docs.persistence.Person" = person
|
||||
}
|
||||
}
|
||||
}
|
||||
//#simplest-custom-serializer-config
|
||||
"""
|
||||
}
|
||||
|
||||
final case class SamplePayload(p: Any)
|
||||
|
||||
//#split-events-during-recovery
|
||||
trait V1
|
||||
trait V2
|
||||
|
||||
// V1 event:
|
||||
final case class UserDetailsChanged(name: String, address: String) extends V1
|
||||
|
||||
// corresponding V2 events:
|
||||
final case class UserNameChanged(name: String) extends V2
|
||||
final case class UserAddressChanged(address: String) extends V2
|
||||
|
||||
// event splitting adapter:
|
||||
class UserEventsAdapter extends EventAdapter {
|
||||
override def manifest(event: Any): String = ""
|
||||
|
||||
override def fromJournal(event: Any, manifest: String): EventSeq = event match {
|
||||
case UserDetailsChanged(null, address) => EventSeq(UserAddressChanged(address))
|
||||
case UserDetailsChanged(name, null) => EventSeq(UserNameChanged(name))
|
||||
case UserDetailsChanged(name, address) => EventSeq(UserNameChanged(name),
|
||||
UserAddressChanged(address))
|
||||
case event: V2 => EventSeq(event)
|
||||
}
|
||||
|
||||
override def toJournal(event: Any): Any = event
|
||||
}
|
||||
//#split-events-during-recovery
|
||||
|
||||
final case class CustomerBlinked(customerId: Long)
|
||||
|
||||
//#string-serializer-skip-deleved-event-by-manifest
|
||||
case object EventDeserializationSkipped
|
||||
|
||||
class RemovedEventsAwareSerializer extends SerializerWithStringManifest {
|
||||
val Utf8 = Charset.forName("UTF-8")
|
||||
override def identifier: Int = 8337
|
||||
|
||||
val SkipEventManifestsEvents = Set(
|
||||
"docs.persistence.CustomerBlinked" // ...
|
||||
)
|
||||
val MyPayloadClassName = classOf[SamplePayload].getName
|
||||
|
||||
override def manifest(o: AnyRef): String = o.getClass.getName
|
||||
|
||||
override def toBinary(o: AnyRef): Array[Byte] = o match {
|
||||
case _ => o.toString.getBytes(Utf8) // example serialization
|
||||
}
|
||||
|
||||
override def fromBinary(bytes: Array[Byte], manifest: String): AnyRef = manifest match {
|
||||
case m if SkipEventManifestsEvents.contains(m) =>
|
||||
EventDeserializationSkipped
|
||||
|
||||
case other => new String(bytes)
|
||||
}
|
||||
}
|
||||
//#string-serializer-skip-deleved-event-by-manifest
|
||||
|
||||
//#string-serializer-skip-deleved-event-by-manifest-adapter
|
||||
class SkippedEventsAwareAdapter extends EventAdapter {
|
||||
override def manifest(event: Any) = ""
|
||||
override def toJournal(event: Any) = event
|
||||
|
||||
override def fromJournal(event: Any, manifest: String) = event match {
|
||||
case EventDeserializationSkipped => EventSeq.empty
|
||||
case _ => EventSeq(event)
|
||||
}
|
||||
}
|
||||
//#string-serializer-skip-deleved-event-by-manifest-adapter
|
||||
|
||||
//#string-serializer-handle-rename
|
||||
class RenamedEventAwareSerializer extends SerializerWithStringManifest {
|
||||
val Utf8 = Charset.forName("UTF-8")
|
||||
override def identifier: Int = 8337
|
||||
|
||||
val OldPayloadClassName = "docs.persistence.OldPayload" // class NOT available anymore
|
||||
val MyPayloadClassName = classOf[SamplePayload].getName
|
||||
|
||||
override def manifest(o: AnyRef): String = o.getClass.getName
|
||||
|
||||
override def toBinary(o: AnyRef): Array[Byte] = o match {
|
||||
case SamplePayload(data) => s"""$data""".getBytes(Utf8)
|
||||
// previously also handled "old" events here.
|
||||
}
|
||||
|
||||
override def fromBinary(bytes: Array[Byte], manifest: String): AnyRef = manifest match {
|
||||
case OldPayloadClassName => SamplePayload(new String(bytes, Utf8))
|
||||
case MyPayloadClassName => SamplePayload(new String(bytes, Utf8))
|
||||
case other => throw new Exception(s"unexpected manifest [$other]")
|
||||
}
|
||||
}
|
||||
//#string-serializer-handle-rename
|
||||
|
||||
//#detach-models
|
||||
/** Domain model - highly optimised for domain language and maybe "fluent" usage */
|
||||
object DomainModel {
|
||||
final case class Customer(name: String)
|
||||
final case class Seat(code: String) {
|
||||
def bookFor(customer: Customer): SeatBooked = SeatBooked(code, customer)
|
||||
}
|
||||
|
||||
final case class SeatBooked(code: String, customer: Customer)
|
||||
}
|
||||
|
||||
/** Data model - highly optimised for schema evolution and persistence */
|
||||
object DataModel {
|
||||
final case class SeatBooked(code: String, customerName: String)
|
||||
}
|
||||
//#detach-models
|
||||
|
||||
//#detach-models-adapter
|
||||
class DetachedModelsAdapter extends EventAdapter {
|
||||
override def manifest(event: Any): String = ""
|
||||
|
||||
override def toJournal(event: Any): Any = event match {
|
||||
case DomainModel.SeatBooked(code, customer) =>
|
||||
DataModel.SeatBooked(code, customer.name)
|
||||
}
|
||||
override def fromJournal(event: Any, manifest: String): EventSeq = event match {
|
||||
case DataModel.SeatBooked(code, customerName) =>
|
||||
EventSeq(DomainModel.SeatBooked(code, DomainModel.Customer(customerName)))
|
||||
}
|
||||
}
|
||||
//#detach-models-adapter
|
||||
|
||||
// act as-if JSON library
|
||||
class ExampleJsonMarshaller {
|
||||
def toJson(any: Any): JsObject = JsObject()
|
||||
def fromJson(json: JsObject): Any = new Object
|
||||
}
|
||||
|
||||
//#detach-models-adapter-json
|
||||
class JsonDataModelAdapter extends EventAdapter {
|
||||
override def manifest(event: Any): String = ""
|
||||
|
||||
val marshaller = new ExampleJsonMarshaller
|
||||
|
||||
override def toJournal(event: Any): JsObject =
|
||||
marshaller.toJson(event)
|
||||
|
||||
override def fromJournal(event: Any, manifest: String): EventSeq = event match {
|
||||
case json: JsObject =>
|
||||
EventSeq(marshaller.fromJson(json))
|
||||
case _ =>
|
||||
throw new IllegalArgumentException(
|
||||
"Unable to fromJournal a non-JSON object! Was: " + event.getClass)
|
||||
}
|
||||
}
|
||||
//#detach-models-adapter-json
|
||||
|
|
@ -12,6 +12,7 @@ Actors
|
|||
routing
|
||||
fsm
|
||||
persistence
|
||||
persistence-schema-evolution
|
||||
persistence-query
|
||||
testing
|
||||
actordsl
|
||||
|
|
|
|||
476
akka-docs/rst/scala/persistence-schema-evolution.rst
Normal file
476
akka-docs/rst/scala/persistence-schema-evolution.rst
Normal file
|
|
@ -0,0 +1,476 @@
|
|||
.. _persistence-schema-evolution-scala:
|
||||
|
||||
##############################
|
||||
Persistence - Schema Evolution
|
||||
##############################
|
||||
|
||||
When working on long running projects using :ref:`persistence-scala`, or any kind of `Event Sourcing`_ architectures,
|
||||
schema evolution becomes one of the more important technical aspects of developing your application.
|
||||
The requirements as well as our own understanding of the business domain may (and will) change in time.
|
||||
|
||||
In fact, if a project matures to the point where you need to evolve its schema to adapt to changing business
|
||||
requirements you can view this as first signs of its success – if you wouldn't need to adapt anything over an apps
|
||||
lifecycle that could mean that no-one is really using it actively.
|
||||
|
||||
In this chapter we will investigate various schema evolution strategies and techniques from which you can pick and
|
||||
choose the ones that match your domain and challenge at hand.
|
||||
|
||||
.. note::
|
||||
This page proposes a number of possible solutions to the schema evolution problem and explains how some of the
|
||||
utilities Akka provides can be used to achieve this, it is by no means a complete (closed) set of solutions.
|
||||
|
||||
Sometimes, based on the capabilities of your serialization formats, you may be able to evolve your schema in
|
||||
different ways than outlined in the sections below. If you discover useful patterns or techniques for schema
|
||||
evolution feel free to submit Pull Requests to this page to extend it.
|
||||
|
||||
|
||||
Schema evolution in event-sourced systems
|
||||
=========================================
|
||||
|
||||
In recent years we have observed a tremendous move towards immutable append-only datastores, with event-sourcing being
|
||||
the prime technique successfully being used in these settings. For an excellent overview why and how immutable data makes scalability
|
||||
and systems design much simpler you may want to read Pat Helland's excellent `Immutability Changes Everything`_ whitepaper.
|
||||
|
||||
Since with `Event Sourcing`_ the **events are immutable** and usually never deleted – the way schema evolution is handled
|
||||
differs from how one would go about it in a mutable database setting (e.g. in typical CRUD database applications).
|
||||
The system needs to be able to continue to work in the presence of "old" events which were stored under the "old" schema.
|
||||
We also want to limit complexity in the business logic layer, exposing a consistent view over all of the events of a given
|
||||
type to :class:`PersistentActor` s and :ref:`persistence queries <persistence-query-scala>`. This allows the business logic layer to focus on solving business problems
|
||||
instead of having to explicitly deal with different schemas.
|
||||
|
||||
The system needs to be able to continue to work in the presence of "old" events which were stored under the "old" schema,
|
||||
and we want to limit the complexity to the data layer, exposing a consistent view over all of the events of a given type
|
||||
to :class:`PersistentActor` s and persistence queries, which allows these layers to focus on the business problems instead
|
||||
handling the different schemas explicitly in the business logic layers.
|
||||
|
||||
|
||||
In summary, schema evolution in event sourced systems exposes the following characteristics:
|
||||
- Allow the system to continue operating without large scale migrations to be applied,
|
||||
- Allow the system to read "old" events from the underlying storage, however present them in a "new" view to the application logic,
|
||||
- Transparently promote events to the latest versions during recovery (or queries) such that the business logic need not consider multiple versions of events
|
||||
|
||||
.. _Immutability Changes Everything: http://www.cidrdb.org/cidr2015/Papers/CIDR15_Paper16.pdf
|
||||
.. _Event Sourcing: http://martinfowler.com/eaaDev/EventSourcing.html
|
||||
|
||||
Types of schema evolution
|
||||
-------------------------
|
||||
Before we explain the various techniques that can be used to safely evolve the schema of your persistent events
|
||||
over time, we first need to define what the actual problem is, and what the typical styles of changes are.
|
||||
|
||||
Since events are never deleted, we need to have a way to be able to replay (read) old events, in such way
|
||||
that does not force the ``PersistentActor`` to be aware of all possible versions of an event that it may have
|
||||
persisted in the past. Instead, we want the Actors to work on some form of "latest" version of the event and provide some
|
||||
means of either converting old "versions" of stored events into this "latest" event type, or constantly evolve the event
|
||||
definition - in a backwards compatible way - such that the new deserialization code can still read old events.
|
||||
|
||||
The most common schema changes you will likely are:
|
||||
|
||||
- :ref:`adding a field to an event type <add-field-scala>`,
|
||||
- :ref:`remove or rename field in event type <rename-field-scala>`,
|
||||
- :ref:`remove event type <remove-event-class-scala>`,
|
||||
- :ref:`split event into multiple smaller events <split-large-event-into-smaller-scala>`.
|
||||
|
||||
The following sections will explain some patterns which can be used to safely evolve your schema when facing those changes.
|
||||
|
||||
Picking the right serialization format
|
||||
======================================
|
||||
|
||||
Picking the serialization format is a very important decision you will have to make while building your application.
|
||||
It affects which kind of evolutions are simple (or hard) to do, how much work is required to add a new datatype, and,
|
||||
last but not least, serialization performanceion.
|
||||
|
||||
If you find yourself realising you have picked "the wrong" serialization format, it is always possible to change
|
||||
the format used for storing new events, however you would have to keep the old deserialization code in order to
|
||||
be able to replay events that were persisted using the old serialization scheme. It is possible to "rebuild"
|
||||
an event-log from one serialization format to another one, however it may be a more involved process if you need
|
||||
to perform this on a live system.
|
||||
|
||||
Binary serialization formats that we have seen work well for long-lived applications include the very flexible IDL based:
|
||||
`Google Protobuf`_, `Apache Thrift`_ or `Apache Avro`_. Avro schema evolution is more "entire schema" based, instead of
|
||||
single fields focused like in protobuf or thrift, and usually requires using some kind of schema registry.
|
||||
|
||||
Users who want their data to be human-readable directly in the write-side
|
||||
datastore may opt to use plain-old `JSON`_ as the storage format, though that comes at a cost of lacking support for schema
|
||||
evolution and relatively large marshalling latency.
|
||||
|
||||
There are plenty excellent blog posts explaining the various trade-offs between popular serialization formats,
|
||||
one post we would like to highlight is the very well illustrated `Schema evolution in Avro, Protocol Buffers and Thrift`_
|
||||
by Martin Kleppmann.
|
||||
|
||||
.. _Google Protobuf: https://developers.google.com/protocol-buffers
|
||||
.. _Apache Avro: https://avro.apache.org
|
||||
.. _JSON: http://json.org
|
||||
.. _Schema evolution in Avro, Protocol Buffers and Thrift: http://martin.kleppmann.com/2012/12/05/schema-evolution-in-avro-protocol-buffers-thrift.html
|
||||
|
||||
Provided default serializers
|
||||
----------------------------
|
||||
|
||||
Akka Persistence provides `Google Protocol Buffers`_ based serializers (using :ref:`Akka Serialization <serialization-scala>`)
|
||||
for it's own message types such as ``PersistentRepr``, ``AtomicWrite`` and snapshots. Journal plugin implementations
|
||||
*may* choose to use those provided serializers, or pick a serializer which suits the underlying database better.
|
||||
|
||||
.. note::
|
||||
Serialization is **NOT** handled automatically by Akka Persistence itself. Instead, it only provides the above described
|
||||
serializers, and in case a ``AsyncWriteJournal`` plugin implementation chooses to use them directly, the above serialization
|
||||
scheme will be used.
|
||||
|
||||
Please refer to your write journal's documentation to learn more about how it handles serialization!
|
||||
|
||||
For example, some journals may choose to not use Akka Serialization *at all* and instead store the data in a format
|
||||
that is more "native" for the underlying datastore, e.g. using JSON or some other kind of format that the target
|
||||
datastore understands directly.
|
||||
|
||||
The below figure explains how the default serialization scheme works, and how it fits together with serializing the
|
||||
user provided message itself, which we will from here on refer to as the ``payload`` (highlighted in yellow):
|
||||
|
||||
.. figure:: ../images/persistent-message-envelope.png
|
||||
:align: center
|
||||
|
||||
Akka Persistence provided serializers wrap the user payload in an envelope containing all persistence-relevant information.
|
||||
**If the Journal uses provided Protobuf serializers for the wrapper types (e.g. PersistentRepr), then the payload will
|
||||
be serialized using the user configured serializer, and if none is provided explicitly, Java serialization will be used for it.**
|
||||
|
||||
The blue colored regions of the ``PersistentMessage`` indicate what is serialized using the generated protocol buffers
|
||||
serializers, and the yellow payload indicates the user provided event (by calling ``persist(payload)(...)``).
|
||||
As you can see, the ``PersistentMessage`` acts as an envelope around the payload, adding various fields related to the
|
||||
origin of the event (``persistenceId``, ``sequenceNr`` and more).
|
||||
|
||||
More advanced techniques (e.g. :ref:`remove-event-class-scala`) will dive into using the manifests for increasing the
|
||||
flexibility of the persisted vs. exposed types even more. Hhowever for now we will focus on the simpler evolution techniques,
|
||||
concerning simply configuring the payload serializers.
|
||||
|
||||
By default the ``payload`` will be serialized using Java Serialization. This is fine for testing and initial phases
|
||||
of your development (while you're still figuring out things and the data will not need to stay persisted forever).
|
||||
However, once you move to production you should really *pick a different serializer for your payloads*.
|
||||
|
||||
.. warning::
|
||||
Do not rely on Java serialization (which will be picked by Akka by default if you don't specify any serializers)
|
||||
for *serious* application development! It does not lean itself well to evolving schemas over long periods of time,
|
||||
and its performance is also not very high (it never was designed for high-throughput scenarios).
|
||||
|
||||
.. _Google Protocol Buffers: https://developers.google.com/protocol-buffers/
|
||||
.. _Apache Thrift: https://thrift.apache.org/
|
||||
|
||||
Configuring payload serializers
|
||||
-------------------------------
|
||||
This section aims to highlight the complete basics on how to define custom serializers using :ref:`Akka Serialization <serialization-scala>`.
|
||||
Many journal plugin implementations use Akka Serialization, thus it is tremendously important to understand how to configure
|
||||
it to work with your event classes.
|
||||
|
||||
.. note::
|
||||
Read the :ref:`Akka Serialization <serialization-scala>` docs to learn more about defining custom serializers,
|
||||
to improve performance and maintainability of your system. Do not depend on Java serialization for production deployments.
|
||||
|
||||
The below snippet explains in the minimal amount of lines how a custom serializer can be registered.
|
||||
For more in-depth explanations on how serialization picks the serializer to use etc, please refer to its documentation.
|
||||
|
||||
First we start by defining our domain model class, here representing a person:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#simplest-custom-serializer-model
|
||||
|
||||
Next we implement a serializer (or extend an existing one to be able to handle the new ``Person`` class):
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#simplest-custom-serializer
|
||||
|
||||
And finally we register the serializer and bind it to handle the ``docs.persistence.Person`` class:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#simplest-custom-serializer-config
|
||||
|
||||
Deserialization will be performed by the same serializer which serialized the message initially
|
||||
because of the ``identifier`` being stored together with the message.
|
||||
|
||||
Please refer to the :ref:`Akka Serialization <serialization-scala>` documentation for more advanced use of serializers,
|
||||
especially the :ref:`string-manifest-serializer-scala` section since it is very useful for Persistence based applications
|
||||
dealing with schema evolutions, as we will see in some of the examples below.
|
||||
|
||||
Schema evolution in action
|
||||
==========================
|
||||
|
||||
In this section we will discuss various schema evolution techniques using concrete examples and explaining
|
||||
some of the various options one might go about handling the described situation. The list below is by no means
|
||||
a complete guide, so feel free to adapt these techniques depending on your serializer's capabilities
|
||||
and/or other domain specific limitations.
|
||||
|
||||
.. _add-field-scala:
|
||||
|
||||
Add fields
|
||||
----------
|
||||
|
||||
**Situation:**
|
||||
You need to add a field to an existing message type. For example, a ``SeatReservation(letter:String, row:Int)`` now
|
||||
needs to have an associated code which indicates if it is a window or aisle seat.
|
||||
|
||||
**Solution:**
|
||||
Adding fields is the most common change you'll need to apply to your messages so make sure the serialization format
|
||||
you picked for your payloads can handle it apropriately, i.e. such changes should be *binary compatible*.
|
||||
This is easily achieved using the right serializer toolkit – we recommend something like `Google Protocol Buffers`_ or
|
||||
`Apache Thrift`_ however other tools may fit your needs just as well – picking a serializer backend is something
|
||||
you should research before picking one to run with. In the following examples we will be using protobuf, mostly because
|
||||
we are familiar with it, it does its job well and Akka is using it internally as well.
|
||||
|
||||
While being able to read messages with missing fields is half of the solution, you also need to deal with the missing
|
||||
values somehow. This is usually modeled as some kind of default value, or by representing the field as an ``Option[T]``
|
||||
See below for an example how reading an optional field from from a serialized protocol buffers message might look like.
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#protobuf-read-optional-model
|
||||
|
||||
Next we prepare an protocol definition using the protobuf Interface Description Language, which we'll use to generate
|
||||
the serializer code to be used on the Akka Serialization layer (notice that the schema aproach allows us to easily rename
|
||||
fields, as long as the numeric identifiers of the fields do not change):
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#protobuf-read-optional-proto
|
||||
|
||||
The serializer implementation uses the protobuf generated classes to marshall the payloads.
|
||||
Optional fields can be handled explicitly or missing values by calling the ``has...`` methods on the protobuf object,
|
||||
which we do for ``seatType`` in order to use a ``Unknown`` type in case the event was stored before we had introduced
|
||||
the field to this event type:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#protobuf-read-optional
|
||||
|
||||
.. _rename-field-scala:
|
||||
|
||||
Rename fields
|
||||
-------------
|
||||
|
||||
**Situation:**
|
||||
When first designing the system the ``SeatReverved`` event featured an ``code`` field.
|
||||
After some time you discover that what what was originally called ``code`` actually means ``seatNr``, thus the model
|
||||
should be changed to reflect this concept more accurately.
|
||||
|
||||
|
||||
**Solution 1 - using IDL based serializers:**
|
||||
First, we will discuss the most efficient way of dealing with such kinds of schema changes – IDL based serializers.
|
||||
|
||||
IDL stands for Interface Description Language, and means that the schema of the messages that will be stored is based
|
||||
on this description. Most IDL based serializers also generate the serializer / deserializer code so that using them
|
||||
is not too hard. Examples of such serializers are protobuf or thrift.
|
||||
|
||||
Using these libraries rename operations are "free", because the field name is never actually stored in the binary
|
||||
representation of the message. This is one of the advantages of schema based serializers, even though that they
|
||||
add the overhead of having to maintain the schema. When using serializers like this, no additional code change
|
||||
(except renaming the field and method used during serialization) is needed to perform such evolution:
|
||||
|
||||
.. figure:: ../images/persistence-serializer-rename.png
|
||||
:align: center
|
||||
|
||||
This is how such a rename would look in protobuf:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#protobuf-rename-proto
|
||||
|
||||
It is important to learn about the strengths and limitations of your serializers, in order to be able to move
|
||||
swiftly and refactor your models fearlessly as you go on with the project.
|
||||
|
||||
.. note::
|
||||
Learn in-depth about the serialization engine you're using as it will impact how you can aproach schema evolution.
|
||||
|
||||
Some operations are "free" in certain serialization formats (more often than not: removing/adding optional fields,
|
||||
sometimes renaming fields etc.), while some other operations are strictly not possible.
|
||||
|
||||
**Solution 2 - by manually handling the event versions:**
|
||||
Another solution, in case your serialization format does not support renames as easily as the above mentioned formats,
|
||||
is versioning your schema. For example, you could have made your events events carry an additional field called ``_version``
|
||||
which was set to ``1`` (because it was the initial schema), and once you change the schema you bump this number to ``2``,
|
||||
and write an adapter which can perform the rename.
|
||||
|
||||
This approach is popular when your serialization format is something like JSON, where renames can not be performed
|
||||
automatically by the serializer. You can do these kinds of "promotions" either manually (as shown in the example below)
|
||||
or using a library like `Stamina`_ which helps to create those ``V1->V2->V3->...->Vn`` promotion chains without much boilerplate.
|
||||
|
||||
.. figure:: ../images/persistence-manual-rename.png
|
||||
:align: center
|
||||
|
||||
The following snippet showcases how one could apply renames if working with plain JSON (using ``spray.json.JsObject``):
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#rename-plain-json
|
||||
|
||||
As you can see, manually handling renames induces some boilerplate onto the EventAdapter, however much of it
|
||||
you will find is common infrastructure code that can be either provided by an external library (for promotion management)
|
||||
or put together in a simple helper trait.
|
||||
|
||||
.. note::
|
||||
The technique of versioning events and then promoting them to the latest version using JSON transformations
|
||||
can of course be applied to more than just field renames – it also applies to adding fields and all kinds of
|
||||
changes in the message format.
|
||||
|
||||
.. _Stamina: https://github.com/scalapenos/stamina
|
||||
|
||||
.. _remove-event-class-scala:
|
||||
|
||||
Remove event class and ignore events
|
||||
------------------------------------
|
||||
|
||||
**Situation:**
|
||||
While investigating app performance you notice that insane amounts of ``CustomerBlinked`` events are being stored
|
||||
for every customer each time he/she blinks. Upon investigation you decide that the event does not add any value
|
||||
and should be deleted. You still have to be able to replay from a journal which contains those old CustomerBlinked events though.
|
||||
|
||||
**Naive solution - drop events in EventAdapter:**
|
||||
|
||||
The problem of removing an event type from the domain model is not as much its removal, as the implications
|
||||
for the recovery mechanisms that this entails. For example, a naive way of filtering out certain kinds of events from
|
||||
being delivered to a recovering ``PersistentActor`` is pretty simple, as one can simply filter them out in an :ref:`EventAdapter <event-adapters-scala>`:
|
||||
|
||||
|
||||
.. figure:: ../images/persistence-drop-event.png
|
||||
:align: center
|
||||
|
||||
The ``EventAdapter`` can drop old events (**O**) by emitting an empty :class:`EventSeq`.
|
||||
Other events can simply be passed through (**E**).
|
||||
|
||||
This however does not address the underlying cost of having to deserialize all the events during recovery,
|
||||
even those which will be filtered out by the adapter. In the next section we will improve the above explained mechanism
|
||||
to avoid deserializing events which would be filtered out by the adapter anyway, thus allowing to save precious time
|
||||
during a recovery containing lots of such events (without actually having to delete them).
|
||||
|
||||
**Improved solution - deserialize into tombstone:**
|
||||
|
||||
In the just described technique we have saved the PersistentActor from receiving un-wanted events by filtering them
|
||||
out in the ``EventAdapter``, however the event itself still was deserialized and loaded into memory.
|
||||
This has two notable *downsides*:
|
||||
|
||||
- first, that the deserialization was actually performed, so we spent some of out time budget on the
|
||||
deserialization, even though the event does not contribute anything to the persistent actors state.
|
||||
- second, that we are *unable to remove the event class* from the system – since the serializer still needs to create
|
||||
the actuall instance of it, as it does not know it will not be used.
|
||||
|
||||
The solution to these problems is to use a serializer that is aware of that event being no longer needed, and can notice
|
||||
this before starting to deserialize the object.
|
||||
|
||||
This aproach allows us to *remove the original class from our classpath*, which makes for less "old" classes lying around in the project.
|
||||
This can for example be implemented by using an ``SerializerWithStringManifest``
|
||||
(documented in depth in :ref:`string-manifest-serializer-scala`). By looking at the string manifest, the serializer can notice
|
||||
that the type is no longer needed, and skip the deserialization all-together:
|
||||
|
||||
.. figure:: ../images/persistence-drop-event-serializer.png
|
||||
:align: center
|
||||
|
||||
The serializer is aware of the old event types that need to be skipped (**O**), and can skip deserializing them alltogether
|
||||
by simply returning a "tombstone" (**T**), which the EventAdapter converts into an empty EventSeq.
|
||||
Other events (**E**) can simply be passed through.
|
||||
|
||||
The serializer detects that the string manifest points to a removed event type and skips attempting to deserialize it:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#string-serializer-skip-deleved-event-by-manifest
|
||||
|
||||
The EventAdapter we implemented is aware of ``EventDeserializationSkipped`` events (our "Tombstones"),
|
||||
and emits and empty ``EventSeq`` whenever such object is encoutered:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#string-serializer-skip-deleved-event-by-manifest-adapter
|
||||
|
||||
.. _detach-domain-from-data-model-scala:
|
||||
|
||||
Detach domain model from data model
|
||||
-----------------------------------
|
||||
|
||||
**Situation:**
|
||||
You want to separate the application model (often called the "*domain model*") completely from the models used to
|
||||
persist the corresponding events (the "*data model*"). For example because the data representation may change
|
||||
independently of the domain model.
|
||||
|
||||
Another situation where this technique may be useful is when your serialization tool of choice requires generated
|
||||
classes to be used for serialization and deserialization of objects, like for example `Google Protocol Buffers`_ do,
|
||||
yet you do not want to leak this implementation detail into the domain model itself, which you'd like to model as
|
||||
plain Scala case classes.
|
||||
|
||||
**Solution:**
|
||||
In order to detach the domain model, which is often represented using pure scala (case) classes, from the data model
|
||||
classes which very often may be less user-friendly yet highly optimised for throughput and schema evolution
|
||||
(like the classes generated by protobuf for example), it is possible to use a simple EventAdapter which maps between
|
||||
these types in a 1:1 style as illustrated below:
|
||||
|
||||
.. figure:: ../images/persistence-detach-models.png
|
||||
:align: center
|
||||
|
||||
Domain events (**A**) are adapted to the data model events (**D**) by the ``EventAdapter``.
|
||||
The data model can be a format natively understood by the journal, such that it can store it more efficiently or
|
||||
include additional data for the event (e.g. tags), for ease of later querying.
|
||||
|
||||
We will use the following domain and data models to showcase how the separation can be implemented by the adapter:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#detach-models
|
||||
|
||||
The :class:`EventAdapter` takes care of converting from one model to the other one (in both directions),
|
||||
alowing the models to be completely detached from each other, such that they can be optimised independently
|
||||
as long as the mapping logic is able to convert between them:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#detach-models-adapter
|
||||
|
||||
The same technique could also be used directly in the Serializer if the end result of marshalling is bytes.
|
||||
Then the serializer can simply convert the bytes do the domain object by using the generated protobuf builders.
|
||||
|
||||
.. _store-human-readable-scala:
|
||||
|
||||
Store events as human-readable data model
|
||||
-----------------------------------------
|
||||
**Situation:**
|
||||
You want to keep your persisted events in a human-readable format, for example JSON.
|
||||
|
||||
**Solution:**
|
||||
This is a special case of the :ref:`detach-domain-from-data-model-scala` pattern, and thus requires some co-operation
|
||||
from the Journal implementation to achieve this.
|
||||
|
||||
An example of a Journal which may implement this pattern is MongoDB, however other databases such as PostgreSQL
|
||||
and Cassandra could also do it because of their built-in JSON capabilities.
|
||||
|
||||
In this aproach, the :class:`EventAdapter` is used as the marshalling layer: it serializes the events to/from JSON.
|
||||
The journal plugin notices that the incoming event type is JSON (for example by performing a ``match`` on the incoming
|
||||
event) and stores the incoming object directly.
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#detach-models-adapter-json
|
||||
|
||||
.. note::
|
||||
This technique only applies if the Akka Persistence plugin you are using provides this capability.
|
||||
Check the documentation of your favourite plugin to see if it supports this style of persistence.
|
||||
|
||||
If it doesn't, you may want to skim the `list of existing journal plugins`_, just in case some other plugin
|
||||
for your favourite datastore *does* provide this capability.
|
||||
|
||||
**Alternative solution:**
|
||||
|
||||
In fact, an AsyncWriteJournal implementation could natively decide to not use binary serialization at all,
|
||||
and *always* serialize the incoming messages as JSON - in which case the ``toJournal`` implementation of the
|
||||
:class:`EventAdapter` would be an identity function, and the ``fromJournal`` would need to de-serialize messages
|
||||
from JSON.
|
||||
|
||||
.. note::
|
||||
If in need of human-readable events on the *write-side* of your application reconsider whether preparing materialized views
|
||||
using :ref:`persistence-query-scala` would not be an efficient way to go about this, without compromising the
|
||||
write-side's throughput characteristics.
|
||||
|
||||
If indeed you want to use a human-readable representation on the write-side, pick a Persistence plugin
|
||||
that provides that functionality, or – implement one yourself.
|
||||
|
||||
|
||||
.. _list of existing journal plugins: http://akka.io/community/#journal-plugins
|
||||
|
||||
.. _split-large-event-into-smaller-scala:
|
||||
|
||||
Split large event into fine-grained events
|
||||
------------------------------------------
|
||||
|
||||
**Situation:**
|
||||
While refactoring your domain events, you find that one of the events has become too large (coarse-grained)
|
||||
and needs to be split up into multiple fine-grained events.
|
||||
|
||||
**Solution:**
|
||||
Let us consider a situation where an event represents "user details changed". After some time we discover that this
|
||||
event is too coarse, and needs to be split into "user name changed" and "user address changed", because somehow
|
||||
users keep changing their usernames a lot and we'd like to keep this as a separate event.
|
||||
|
||||
The write side change is very simple, we simply persist ``UserNameChanged`` or ``UserAddressChanged`` depending
|
||||
on what the user actually intended to change (instead of the composite ``UserDetailsChanged`` that we had in version 1
|
||||
of our model).
|
||||
|
||||
.. figure:: ../images/persistence-event-adapter-1-n.png
|
||||
:align: center
|
||||
|
||||
The ``EventAdapter`` splits the incoming event into smaller more fine grained events during recovery.
|
||||
|
||||
During recovery however, we now need to convert the old ``V1`` model into the ``V2`` representation of the change.
|
||||
Depending if the old event contains a name change, we either emit the ``UserNameChanged`` or we don't,
|
||||
and the address change is handled similarily:
|
||||
|
||||
.. includecode:: code/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala#split-events-during-recovery
|
||||
|
||||
By returning an :class:`EventSeq` from the event adapter, the recovered event can be converted to multiple events before
|
||||
being delivered to the persistent actor.
|
||||
|
|
@ -597,10 +597,6 @@ configuration key. The method can be overridden by implementation classes to ret
|
|||
Event Adapters
|
||||
==============
|
||||
|
||||
.. note::
|
||||
|
||||
Complete documentation featuring use-cases and implementation examples for this feature will follow shortly.
|
||||
|
||||
In long running projects using event sourcing sometimes the need arises to detach the data model from the domain model
|
||||
completely.
|
||||
|
||||
|
|
@ -634,10 +630,7 @@ indeed adapt it return the adapted event(s) for it, other adapters which do not
|
|||
adaptation simply return ``EventSeq.empty``. The adapted events are then delivered in-order to the ``PersistentActor`` during replay.
|
||||
|
||||
.. note::
|
||||
More advanced techniques utilising advanced binary serialization formats such as protocol buffers or kryo / thrift / avro
|
||||
will be documented very soon. These schema evolutions often may need to reach into the serialization layer, however
|
||||
are much more powerful in terms of flexibly removing unused/deprecated classes from your classpath etc.
|
||||
|
||||
For more advanced schema evolution techniques refer to the :ref:`persistence-schema-evolution-scala` documentation.
|
||||
|
||||
.. _persistent-fsm:
|
||||
|
||||
|
|
@ -885,6 +878,8 @@ it must add
|
|||
|
||||
to the application configuration. If not specified, a default serializer is used.
|
||||
|
||||
For more advanced schema evolution techniques refer to the :ref:`persistence-schema-evolution-scala` documentation.
|
||||
|
||||
Testing
|
||||
=======
|
||||
|
||||
|
|
|
|||
|
|
@ -103,11 +103,13 @@ bytes to different objects.
|
|||
Then you only need to fill in the blanks, bind it to a name in your :ref:`configuration` and then
|
||||
list which classes that should be serialized using it.
|
||||
|
||||
.. _string-manifest-serializer-scala:
|
||||
|
||||
Serializer with String Manifest
|
||||
-------------------------------
|
||||
|
||||
The ``Serializer`` illustrated above supports a class based manifest (type hint).
|
||||
For serialization of data that need to evolve over time the `SerializerWithStringManifest`
|
||||
For serialization of data that need to evolve over time the ``SerializerWithStringManifest``
|
||||
is recommended instead of ``Serializer`` because the manifest (type hint) is a ``String``
|
||||
instead of a ``Class``. That means that the class can be moved/removed and the serializer
|
||||
can still deserialize old data by matching on the ``String``. This is especially useful
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue