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ActorContext.getParent for Java API #22413

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Johan Andrén 2017-03-16 09:30:00 +01:00 • committed by GitHub
parent 5ff44194a3
commit 2eb226ed32
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129
akka-docs/rst/java/code/docs/persistence/PersistentActorExample.java
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/**
* Copyright (C) 2009-2017 Lightbend Inc. <http://www.lightbend.com>
*/
package docs.persistence;
//#persistent-actor-example
import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import akka.persistence.AbstractPersistentActor;
import akka.persistence.SnapshotOffer;
import java.io.Serializable;
import java.util.ArrayList;
import static java.util.Arrays.asList;
class Cmd implements Serializable {
private static final long serialVersionUID = 1L;
private final String data;
public Cmd(String data) {
this.data = data;
}
public String getData() {
return data;
}
}
class Evt implements Serializable {
private static final long serialVersionUID = 1L;
private final String data;
public Evt(String data) {
this.data = data;
}
public String getData() {
return data;
}
}
class ExampleState implements Serializable {
private static final long serialVersionUID = 1L;
private final ArrayList<String> events;
public ExampleState() {
this(new ArrayList<>());
}
public ExampleState(ArrayList<String> events) {
this.events = events;
}
public ExampleState copy() {
return new ExampleState(new ArrayList<>(events));
}
public void update(Evt evt) {
events.add(evt.getData());
}
public int size() {
return events.size();
}
@Override
public String toString() {
return events.toString();
}
}
class ExamplePersistentActor extends AbstractPersistentActor {
private ExampleState state = new ExampleState();
private int snapShotInterval = 1000;
public int getNumEvents() {
return state.size();
}
@Override
public String persistenceId() { return "sample-id-1"; }
@Override
public Receive createReceiveRecover() {
return receiveBuilder()
.match(Evt.class, state::update)
.match(SnapshotOffer.class, ss -> state = (ExampleState) ss.snapshot())
.build();
}
@Override
public Receive createReceive() {
return receiveBuilder()
.match(Cmd.class, c -> {
final String data = c.getData();
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("print", s -> System.out.println(state))
.build();
}
}
//#persistent-actor-example
public class PersistentActorExample {
public static void main(String... args) throws Exception {
final ActorSystem system = ActorSystem.create("example");
final ActorRef persistentActor = system.actorOf(Props.create(ExamplePersistentActor.class), "persistentActor-4-java8");
persistentActor.tell(new Cmd("foo"), null);
persistentActor.tell(new Cmd("baz"), null);
persistentActor.tell(new Cmd("bar"), null);
persistentActor.tell(new Cmd("buzz"), null);
persistentActor.tell("print", null);
Thread.sleep(10000);
system.terminate();
}
}