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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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12
akka-docs/rst/java/code/docs/persistence/LambdaPersistenceDocTest.java
View file

@ -234,13 +234,14 @@ public class LambdaPersistenceDocTest {
static Object o4 = new Object() {
class MyPersistentActor extends AbstractPersistentActor {
private void updateState(String evt){}
//#save-snapshot
private Object state;
private int snapShotInterval = 1000;
@Override public Receive createReceive() {
return receiveBuilder().
match(String.class, s -> s.equals("snap"),
s -> saveSnapshot(state)).
match(SaveSnapshotSuccess.class, ss -> {
SnapshotMetadata metadata = ss.metadata();
// ...
@ -248,6 +249,13 @@ public class LambdaPersistenceDocTest {
match(SaveSnapshotFailure.class, sf -> {
SnapshotMetadata metadata = sf.metadata();
// ...
}).
match(String.class, cmd -> {
persist( "evt-" + cmd, e -> {
updateState(e);
if (lastSequenceNr() % snapShotInterval == 0 && lastSequenceNr() != 0)
saveSnapshot(state);
});
}).build();
}
//#save-snapshot

17
akka-docs/rst/java/code/docs/persistence/PersistentActorExample.java
View file

@ -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);

10
akka-docs/rst/scala/code/docs/persistence/PersistenceDocSpec.scala
View file

@ -159,13 +159,21 @@ object PersistenceDocSpec {
class MyPersistentActor extends PersistentActor {
override def persistenceId = "my-stable-persistence-id"
def updateState(event: String): Unit = {}
//#save-snapshot
var state: Any = _
val snapShotInterval = 1000
override def receiveCommand: Receive = {
case "snap" => saveSnapshot(state)
case SaveSnapshotSuccess(metadata) => // ...
case SaveSnapshotFailure(metadata, reason) => // ...
case cmd: String =>
persist(s"evt-$cmd") { e =>
updateState(e)
if (lastSequenceNr % snapShotInterval == 0 && lastSequenceNr != 0)
saveSnapshot(state)
}
}
//#save-snapshot

8
akka-docs/rst/scala/code/docs/persistence/PersistentActorExample.scala
View file

@ -29,14 +29,15 @@ class ExamplePersistentActor extends PersistentActor {
case SnapshotOffer(_, snapshot: ExampleState) => state = snapshot
}
val snapShotInterval = 1000
val receiveCommand: Receive = {
case Cmd(data) =>
persist(Evt(s"${data}-${numEvents}"))(updateState)
persist(Evt(s"${data}-${numEvents + 1}")) { event =>
persist(Evt(s"${data}-${numEvents}")) { event =>
updateState(event)
context.system.eventStream.publish(event)
if (lastSequenceNr % snapShotInterval == 0 && lastSequenceNr != 0)
saveSnapshot(state)
}
case "snap" => saveSnapshot(state)
case "print" => println(state)
}
@ -51,7 +52,6 @@ object PersistentActorExample extends App {
persistentActor ! Cmd("foo")
persistentActor ! Cmd("baz")
persistentActor ! Cmd("bar")
persistentActor ! "snap"
persistentActor ! Cmd("buzz")
persistentActor ! "print"