ActorContext.getParent for Java API #22413

akka-docs/rst/java/code/jdocs/persistence/query/LeveldbPersistenceQueryDocTest.java

@@ -0,0 +1,94 @@
+/**
+ * Copyright (C) 2009-2017 Lightbend Inc. <http://www.lightbend.com>
+ */
+
+package jdocs.persistence.query;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import akka.NotUsed;
+import akka.actor.ActorSystem;
+import akka.persistence.journal.WriteEventAdapter;
+import akka.persistence.journal.Tagged;
+import akka.persistence.query.EventEnvelope;
+import akka.persistence.query.Sequence;
+import akka.persistence.query.PersistenceQuery;
+import akka.persistence.query.journal.leveldb.javadsl.LeveldbReadJournal;
+import akka.stream.ActorMaterializer;
+import akka.stream.javadsl.Source;
+
+public class LeveldbPersistenceQueryDocTest {
+
+  final ActorSystem system = ActorSystem.create();
+
+  public void demonstrateReadJournal() {
+    //#get-read-journal
+    final ActorMaterializer mat = ActorMaterializer.create(system);
+    
+    LeveldbReadJournal queries =
+      PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class, 
+          LeveldbReadJournal.Identifier());
+    //#get-read-journal
+  }
+  
+  public void demonstrateEventsByPersistenceId() {
+    //#EventsByPersistenceId
+    LeveldbReadJournal queries =
+        PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class, 
+            LeveldbReadJournal.Identifier());
+    
+    Source<EventEnvelope, NotUsed> source =
+        queries.eventsByPersistenceId("some-persistence-id", 0, Long.MAX_VALUE);
+    //#EventsByPersistenceId
+  }
+  
+  public void demonstrateAllPersistenceIds() {
+    //#AllPersistenceIds
+    LeveldbReadJournal queries =
+        PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class, 
+            LeveldbReadJournal.Identifier());
+    
+    Source<String, NotUsed> source = queries.persistenceIds();
+    //#AllPersistenceIds
+  }
+  
+  public void demonstrateEventsByTag() {
+    //#EventsByTag
+    LeveldbReadJournal queries =
+        PersistenceQuery.get(system).getReadJournalFor(LeveldbReadJournal.class, 
+            LeveldbReadJournal.Identifier());
+    
+    Source<EventEnvelope, NotUsed> source =
+        queries.eventsByTag("green", new Sequence(0L));
+    //#EventsByTag
+  }
+  
+  static 
+  //#tagger
+  public class MyTaggingEventAdapter implements WriteEventAdapter {
+
+    @Override
+    public Object toJournal(Object event) {
+      if (event instanceof String) {
+        String s = (String) event;
+        Set<String> tags = new HashSet<String>();
+        if (s.contains("green")) tags.add("green");
+        if (s.contains("black")) tags.add("black");
+        if (s.contains("blue")) tags.add("blue");
+        if (tags.isEmpty())
+          return event;
+        else
+          return new Tagged(event, tags);
+      } else {
+        return event;
+      }
+    }
+    
+    @Override
+    public String manifest(Object event) {
+      return "";
+    }
+  }
+  //#tagger
+}