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* Add Circuit Breaker to akka.pattern for general use. Circuit breaker implementation as described by Michael T. Nygard in Release It!. Fixes #1734

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* Uses finite state machine for three states: Closed, Open, Half-Open
    * Closed state allows calls through, and on sequential failures exceeding the max# set - transitions to Open state. Intervening successes cause the failure count to reset to 0
    * Open state throws a CircuitOpenException on every call until the reset timeout is reached which causes a transition to Half-Open state
    * Half-Open state will allow the next single call through, if it succeeds - transition to Closed state, if it fails - transition back to Open state, starting the reset timer again
  * Allow configuration for the call and reset timeouts, as well as the maximum number of sequential failures before opening
  * Supports async or synchronous call protection
  * Callbacks are supported for state entry into Closed, Open, Half-Open.  These are run in the supplied execution context
  * Both thrown exceptions and calls exceeding max call time are considered failures
  * Uses akka scheduler for timer events
  * Integrated into File-Based durable mailbox
  * Sample documented for other durable mailboxes
This commit is contained in:
Brian Scully 2012-06-01 08:24:47 -04:00
parent 85c263e077
commit 6a415f0e9b
15 changed files with 1266 additions and 25 deletions
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akka-docs/conf.py
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@ -8,7 +8,7 @@ import sys, os
# -- General configuration -----------------------------------------------------
sys.path.append(os.path.abspath('_sphinx/exts'))
extensions = ['sphinx.ext.todo', 'includecode']
extensions = ['sphinx.ext.todo', 'includecode', 'sphinx.ext.graphviz']
templates_path = ['_templates']
source_suffix = '.rst'