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Update Persistence Snapshot documentation (#22419)

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* Update Persistence Snapshot documentation (#22233)

* Use copy of ExampleState as it is mutable
This commit is contained in:
Richard Imaoka 2017-03-14 21:30:32 +09:00 • committed by Patrik Nordwall
parent e77c3c3e8a
commit ea9617aa25
4 changed files with 31 additions and 16 deletions
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17
akka-docs/rst/java/code/docs/persistence/PersistentActorExample.java
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@ -76,6 +76,7 @@ class ExampleState implements Serializable {
class ExamplePersistentActor extends AbstractPersistentActor {
private ExampleState state = new ExampleState();
private int snapShotInterval = 1000;
public int getNumEvents() {
return state.size();
@ -97,16 +98,15 @@ class ExamplePersistentActor extends AbstractPersistentActor {
return receiveBuilder()
.match(Cmd.class, c -> {
final String data = c.getData();
final Evt evt1 = new Evt(data + "-" + getNumEvents());
final Evt evt2 = new Evt(data + "-" + (getNumEvents() + 1));
persistAll(asList(evt1, evt2), (Evt evt) -> {
state.update(evt);
if (evt.equals(evt2)) {
getContext().system().eventStream().publish(evt);
}
final Evt evt = new Evt(data + "-" + getNumEvents());
persist(evt, (Evt e) -> {
state.update(e);
getContext().system().eventStream().publish(e);
if (lastSequenceNr() % snapShotInterval == 0 && lastSequenceNr() != 0)
// IMPORTANT: create a copy of snapshot because ExampleState is mutable
saveSnapshot(state.copy());
});
})
.matchEquals("snap", s -> saveSnapshot(state.copy()))
.matchEquals("print", s -> System.out.println(state))
.build();
}
@ -120,7 +120,6 @@ public class PersistentActorExample {
persistentActor.tell(new Cmd("foo"), null);
persistentActor.tell(new Cmd("baz"), null);
persistentActor.tell(new Cmd("bar"), null);
persistentActor.tell("snap", null);
persistentActor.tell(new Cmd("buzz"), null);
persistentActor.tell("print", null);