546 lines
15 KiB
Java
546 lines
15 KiB
Java
/**
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* Copyright (C) 2009-2015 Typesafe Inc. <http://www.typesafe.com>
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*/
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package docs.persistence;
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import akka.actor.AbstractActor;
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import akka.actor.ActorPath;
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import akka.actor.ActorRef;
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import akka.actor.ActorSystem;
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import akka.actor.Props;
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import akka.japi.Procedure;
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import akka.japi.pf.ReceiveBuilder;
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import akka.persistence.*;
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import scala.Option;
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import scala.concurrent.duration.Duration;
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import scala.PartialFunction;
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import scala.runtime.BoxedUnit;
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import java.io.Serializable;
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import java.util.concurrent.TimeUnit;
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public class LambdaPersistenceDocTest {
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public interface SomeOtherMessage {}
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public interface PersistentActorMethods {
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//#persistence-id
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public String persistenceId();
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//#persistence-id
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//#recovery-status
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public boolean recoveryRunning();
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public boolean recoveryFinished();
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//#recovery-status
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}
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static Object o2 = new Object() {
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abstract class MyPersistentActor1 extends AbstractPersistentActor {
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//#recovery-disabled
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@Override
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public Recovery recovery() {
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return Recovery.none();
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}
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//#recovery-disabled
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//#recover-on-restart-disabled
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@Override
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public void preRestart(Throwable reason, Option<Object> message) {}
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//#recover-on-restart-disabled
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}
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abstract class MyPersistentActor2 extends AbstractPersistentActor {
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//#recovery-custom
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@Override
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public Recovery recovery() {
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return Recovery.create(457L);
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}
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//#recovery-custom
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}
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class MyPersistentActor4 extends AbstractPersistentActor implements PersistentActorMethods {
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//#persistence-id-override
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@Override
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public String persistenceId() {
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return "my-stable-persistence-id";
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}
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//#persistence-id-override
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@Override
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public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.
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match(String.class, cmd -> {/* ... */}).build();
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}
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@Override
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public PartialFunction<Object, BoxedUnit> receiveRecover() {
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return ReceiveBuilder.
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match(String.class, evt -> {/* ... */}).build();
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}
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}
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//#recovery-completed
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class MyPersistentActor5 extends AbstractPersistentActor {
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@Override public String persistenceId() {
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return "my-stable-persistence-id";
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveRecover() {
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return ReceiveBuilder.
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match(RecoveryCompleted.class, r -> {
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// perform init after recovery, before any other messages
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// ...
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}).
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match(String.class, this::handleEvent).build();
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.
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match(String.class, s -> s.equals("cmd"),
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s -> persist("evt", this::handleEvent)).build();
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}
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private void handleEvent(String event) {
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// update state
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// ...
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}
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}
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//#recovery-completed
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abstract class MyActor extends AbstractPersistentActor {
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//#backoff
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@Override
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public void preStart() throws Exception {
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final Props childProps = Props.create(MyPersistentActor1.class);
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final Props props = BackoffSupervisor.props(
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childProps,
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"myActor",
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Duration.create(3, TimeUnit.SECONDS),
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Duration.create(30, TimeUnit.SECONDS),
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0.2);
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context().actorOf(props, "mySupervisor");
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super.preStart();
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}
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//#backoff
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}
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};
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static Object atLeastOnceExample = new Object() {
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//#at-least-once-example
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class Msg implements Serializable {
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private static final long serialVersionUID = 1L;
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public final long deliveryId;
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public final String s;
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public Msg(long deliveryId, String s) {
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this.deliveryId = deliveryId;
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this.s = s;
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}
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}
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class Confirm implements Serializable {
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private static final long serialVersionUID = 1L;
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public final long deliveryId;
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public Confirm(long deliveryId) {
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this.deliveryId = deliveryId;
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}
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}
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class MsgSent implements Serializable {
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private static final long serialVersionUID = 1L;
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public final String s;
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public MsgSent(String s) {
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this.s = s;
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}
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}
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class MsgConfirmed implements Serializable {
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private static final long serialVersionUID = 1L;
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public final long deliveryId;
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public MsgConfirmed(long deliveryId) {
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this.deliveryId = deliveryId;
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}
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}
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class MyPersistentActor extends AbstractPersistentActorWithAtLeastOnceDelivery {
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private final ActorPath destination;
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public MyPersistentActor(ActorPath destination) {
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this.destination = destination;
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}
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@Override public String persistenceId() {
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return "persistence-id";
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}
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@Override
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public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.
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match(String.class, s -> {
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persist(new MsgSent(s), evt -> updateState(evt));
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}).
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match(Confirm.class, confirm -> {
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persist(new MsgConfirmed(confirm.deliveryId), evt -> updateState(evt));
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}).
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build();
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}
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@Override
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public PartialFunction<Object, BoxedUnit> receiveRecover() {
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return ReceiveBuilder.
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match(Object.class, evt -> updateState(evt)).build();
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}
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void updateState(Object event) {
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if (event instanceof MsgSent) {
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final MsgSent evt = (MsgSent) event;
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deliver(destination, deliveryId -> new Msg(deliveryId, evt.s));
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} else if (event instanceof MsgConfirmed) {
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final MsgConfirmed evt = (MsgConfirmed) event;
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confirmDelivery(evt.deliveryId);
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}
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}
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}
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class MyDestination extends AbstractActor {
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public MyDestination() {
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receive(ReceiveBuilder.
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match(Msg.class, msg -> {
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// ...
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sender().tell(new Confirm(msg.deliveryId), self());
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}).build()
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);
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}
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}
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//#at-least-once-example
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};
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static Object o4 = new Object() {
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class MyPersistentActor extends AbstractPersistentActor {
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//#save-snapshot
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private Object state;
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@Override public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.
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match(String.class, s -> s.equals("snap"),
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s -> saveSnapshot(state)).
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match(SaveSnapshotSuccess.class, ss -> {
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SnapshotMetadata metadata = ss.metadata();
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// ...
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}).
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match(SaveSnapshotFailure.class, sf -> {
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SnapshotMetadata metadata = sf.metadata();
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// ...
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}).build();
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}
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//#save-snapshot
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@Override public String persistenceId() {
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return "persistence-id";
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveRecover() {
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return ReceiveBuilder.
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match(RecoveryCompleted.class, r -> {/* ...*/}).build();
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}
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}
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};
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static Object o5 = new Object() {
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class MyPersistentActor extends AbstractPersistentActor {
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//#snapshot-criteria
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@Override
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public Recovery recovery() {
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return Recovery.create(
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SnapshotSelectionCriteria
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.create(457L, System.currentTimeMillis()));
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}
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//#snapshot-criteria
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//#snapshot-offer
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private Object state;
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@Override public PartialFunction<Object, BoxedUnit> receiveRecover() {
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return ReceiveBuilder.
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match(SnapshotOffer.class, s -> {
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state = s.snapshot();
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// ...
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}).
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match(String.class, s -> {/* ...*/}).build();
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}
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//#snapshot-offer
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@Override public String persistenceId() {
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return "persistence-id";
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.
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match(String.class, s -> {/* ...*/}).build();
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}
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}
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class MyActor extends AbstractActor {
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ActorRef persistentActor;
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public MyActor() {
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persistentActor = context().actorOf(Props.create(MyPersistentActor.class));
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receive(ReceiveBuilder.
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match(Object.class, o -> {/* ... */}).build()
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);
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}
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}
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};
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static Object o9 = new Object() {
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//#persist-async
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class MyPersistentActor extends AbstractPersistentActor {
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@Override public String persistenceId() {
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return "my-stable-persistence-id";
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}
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private void handleCommand(String c) {
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sender().tell(c, self());
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persistAsync(String.format("evt-%s-1", c), e -> {
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sender().tell(e, self());
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});
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persistAsync(String.format("evt-%s-2", c), e -> {
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sender().tell(e, self());
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});
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveRecover() {
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return ReceiveBuilder.
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match(String.class, this::handleCommand).build();
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.
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match(String.class, this::handleCommand).build();
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}
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}
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//#persist-async
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public void usage() {
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final ActorSystem system = ActorSystem.create("example");
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//#persist-async-usage
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final ActorRef persistentActor = system.actorOf(Props.create(MyPersistentActor.class));
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persistentActor.tell("a", null);
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persistentActor.tell("b", null);
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// possible order of received messages:
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// a
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// b
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// evt-a-1
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// evt-a-2
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// evt-b-1
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// evt-b-2
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//#persist-async-usage
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}
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};
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static Object o10 = new Object() {
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//#defer
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class MyPersistentActor extends AbstractPersistentActor {
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@Override public String persistenceId() {
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return "my-stable-persistence-id";
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}
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private void handleCommand(String c) {
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persistAsync(String.format("evt-%s-1", c), e -> {
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sender().tell(e, self());
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});
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persistAsync(String.format("evt-%s-2", c), e -> {
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sender().tell(e, self());
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});
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deferAsync(String.format("evt-%s-3", c), e -> {
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sender().tell(e, self());
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});
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveRecover() {
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return ReceiveBuilder.
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match(String.class, this::handleCommand).build();
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.
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match(String.class, this::handleCommand).build();
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}
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}
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//#defer
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public void usage() {
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final ActorSystem system = ActorSystem.create("example");
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final ActorRef sender = null; // your imaginary sender here
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//#defer-caller
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final ActorRef persistentActor = system.actorOf(Props.create(MyPersistentActor.class));
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persistentActor.tell("a", sender);
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persistentActor.tell("b", sender);
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// order of received messages:
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// a
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// b
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// evt-a-1
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// evt-a-2
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// evt-a-3
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// evt-b-1
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// evt-b-2
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// evt-b-3
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//#defer-caller
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}
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};
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static Object o11 = new Object() {
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class MyPersistentActor extends AbstractPersistentActor {
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@Override
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public String persistenceId() {
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return "my-stable-persistence-id";
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.matchAny(event -> {}).build();
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}
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//#nested-persist-persist
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@Override public PartialFunction<Object, BoxedUnit> receiveRecover() {
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final Procedure<String> replyToSender = event -> sender().tell(event, self());
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return ReceiveBuilder
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.match(String.class, msg -> {
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persist(String.format("%s-outer-1", msg), event -> {
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sender().tell(event, self());
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persist(String.format("%s-inner-1", event), replyToSender);
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});
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persist(String.format("%s-outer-2", msg), event -> {
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sender().tell(event, self());
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persist(String.format("%s-inner-2", event), replyToSender);
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});
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})
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.build();
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}
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//#nested-persist-persist
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void usage(ActorRef persistentActor) {
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//#nested-persist-persist-caller
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persistentActor.tell("a", ActorRef.noSender());
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persistentActor.tell("b", ActorRef.noSender());
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// order of received messages:
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// a
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// a-outer-1
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// a-outer-2
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// a-inner-1
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// a-inner-2
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// and only then process "b"
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// b
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// b-outer-1
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// b-outer-2
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// b-inner-1
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// b-inner-2
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//#nested-persist-persist-caller
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}
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}
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class MyPersistAsyncActor extends AbstractPersistentActor {
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@Override
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public String persistenceId() {
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return "my-stable-persistence-id";
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}
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@Override public PartialFunction<Object, BoxedUnit> receiveCommand() {
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return ReceiveBuilder.matchAny(event -> {}).build();
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}
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//#nested-persistAsync-persistAsync
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@Override public PartialFunction<Object, BoxedUnit> receiveRecover() {
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final Procedure<String> replyToSender = event -> sender().tell(event, self());
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return ReceiveBuilder
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.match(String.class, msg -> {
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persistAsync(String.format("%s-outer-1", msg ), event -> {
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sender().tell(event, self());
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persistAsync(String.format("%s-inner-1", event), replyToSender);
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});
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persistAsync(String.format("%s-outer-2", msg ), event -> {
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sender().tell(event, self());
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persistAsync(String.format("%s-inner-1", event), replyToSender);
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});
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})
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.build();
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}
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//#nested-persistAsync-persistAsync
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void usage(ActorRef persistentActor) {
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//#nested-persistAsync-persistAsync-caller
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persistentActor.tell("a", self());
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persistentActor.tell("b", self());
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// order of received messages:
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// a
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// b
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// a-outer-1
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// a-outer-2
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// b-outer-1
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// b-outer-2
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// a-inner-1
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// a-inner-2
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// b-inner-1
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// b-inner-2
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// which can be seen as the following causal relationship:
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// a -> a-outer-1 -> a-outer-2 -> a-inner-1 -> a-inner-2
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// b -> b-outer-1 -> b-outer-2 -> b-inner-1 -> b-inner-2
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//#nested-persistAsync-persistAsync-caller
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}
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}
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};
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static Object o12 = new Object() {
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//#view
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class MyView extends AbstractPersistentView {
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@Override public String persistenceId() { return "some-persistence-id"; }
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@Override public String viewId() { return "some-persistence-id-view"; }
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public MyView() {
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receive(ReceiveBuilder.
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match(Object.class, p -> isPersistent(), persistent -> {
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// ...
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}).build()
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);
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}
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}
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//#view
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public void usage() {
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final ActorSystem system = ActorSystem.create("example");
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//#view-update
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final ActorRef view = system.actorOf(Props.create(MyView.class));
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view.tell(Update.create(true), null);
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//#view-update
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}
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};
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}
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