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Akka/Scala example source code file (LambdaPersistenceDocTest.java)
The LambdaPersistenceDocTest.java Akka example source code/** * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com> */ package doc; import akka.actor.AbstractActor; import akka.actor.ActorPath; import akka.actor.ActorRef; import akka.actor.ActorSystem; import akka.actor.Props; import akka.japi.pf.ReceiveBuilder; import akka.persistence.*; import scala.Option; import scala.PartialFunction; import scala.concurrent.duration.Duration; import scala.runtime.BoxedUnit; import java.io.Serializable; import java.util.concurrent.TimeUnit; import static java.util.Arrays.asList; public class LambdaPersistenceDocTest { public interface SomeOtherMessage {} public interface ProcessorMethods { //#persistence-id public String persistenceId(); //#persistence-id //#recovery-status public boolean recoveryRunning(); public boolean recoveryFinished(); //#recovery-status //#current-message public Persistent getCurrentPersistentMessage(); //#current-message } static Object o1 = new Object() { //#definition class MyProcessor extends AbstractProcessor { public MyProcessor() { receive(ReceiveBuilder. match(Persistent.class, p -> { // message successfully written to journal Object payload = p.payload(); Long sequenceNr = p.sequenceNr(); // ... }). match(PersistenceFailure.class, failure -> { // message failed to be written to journal Object payload = failure.payload(); Long sequenceNr = failure.sequenceNr(); Throwable cause = failure.cause(); // ... }). match(SomeOtherMessage.class, message -> { // message not written to journal }).build() ); } } //#definition class MyActor extends AbstractActor { ActorRef processor; public MyActor() { //#usage processor = context().actorOf(Props.create(MyProcessor.class), "myProcessor"); processor.tell(Persistent.create("foo"), null); processor.tell("bar", null); //#usage receive(ReceiveBuilder. match(Persistent.class, received -> {/* ... */}).build() ); } private void recover() { //#recover-explicit processor.tell(Recover.create(), null); //#recover-explicit } } }; static Object o2 = new Object() { abstract class MyProcessor1 extends AbstractProcessor { //#recover-on-start-disabled @Override public void preStart() {} //#recover-on-start-disabled //#recover-on-restart-disabled @Override public void preRestart(Throwable reason, Option<Object> message) {} //#recover-on-restart-disabled } abstract class MyProcessor2 extends AbstractProcessor { //#recover-on-start-custom @Override public void preStart() { self().tell(Recover.create(457L), null); } //#recover-on-start-custom } abstract class MyProcessor3 extends AbstractProcessor { //#deletion @Override public void preRestart(Throwable reason, Option<Object> message) { if (message.isDefined() && message.get() instanceof Persistent) { deleteMessage(((Persistent) message.get()).sequenceNr()); } super.preRestart(reason, message); } //#deletion } class MyProcessor4 extends AbstractProcessor implements ProcessorMethods { //#persistence-id-override @Override public String persistenceId() { return "my-stable-persistence-id"; } //#persistence-id-override public MyProcessor4() { receive(ReceiveBuilder. match(Persistent.class, received -> {/* ... */}).build() ); } } //#recovery-completed class MyPersistentActor5 extends AbstractPersistentActor { @Override public String persistenceId() { return "my-stable-persistence-id"; } @Override public PartialFunction<Object, BoxedUnit> receiveRecover() { return ReceiveBuilder. match(RecoveryCompleted.class, r -> { recoveryCompleted(); }). match(String.class, this::handleEvent).build(); } @Override public PartialFunction<Object, BoxedUnit> receiveCommand() { return ReceiveBuilder. match(String.class, s -> s.equals("cmd"), s -> persist("evt", this::handleEvent)).build(); } private void recoveryCompleted() { // perform init after recovery, before any other messages // ... } private void handleEvent(String event) { // update state // ... } } //#recovery-completed }; static Object atLeastOnceExample = new Object() { //#at-least-once-example class Msg implements Serializable { public final long deliveryId; public final String s; public Msg(long deliveryId, String s) { this.deliveryId = deliveryId; this.s = s; } } class Confirm implements Serializable { public final long deliveryId; public Confirm(long deliveryId) { this.deliveryId = deliveryId; } } class MsgSent implements Serializable { public final String s; public MsgSent(String s) { this.s = s; } } class MsgConfirmed implements Serializable { public final long deliveryId; public MsgConfirmed(long deliveryId) { this.deliveryId = deliveryId; } } class MyPersistentActor extends AbstractPersistentActorWithAtLeastOnceDelivery { private final ActorPath destination; public MyPersistentActor(ActorPath destination) { this.destination = destination; } @Override public PartialFunction<Object, BoxedUnit> receiveCommand() { return ReceiveBuilder. match(String.class, s -> { persist(new MsgSent(s), evt -> updateState(evt)); }). match(Confirm.class, confirm -> { persist(new MsgConfirmed(confirm.deliveryId), evt -> updateState(evt)); }). build(); } @Override public PartialFunction<Object, BoxedUnit> receiveRecover() { return ReceiveBuilder. match(Object.class, evt -> updateState(evt)).build(); } void updateState(Object event) { if (event instanceof MsgSent) { final MsgSent evt = (MsgSent) event; deliver(destination, deliveryId -> new Msg(deliveryId, evt.s)); } else if (event instanceof MsgConfirmed) { final MsgConfirmed evt = (MsgConfirmed) event; confirmDelivery(evt.deliveryId); } } } class MyDestination extends AbstractActor { public MyDestination() { receive(ReceiveBuilder. match(Msg.class, msg -> { // ... sender().tell(new Confirm(msg.deliveryId), self()); }).build() ); } } //#at-least-once-example }; static Object o3 = new Object() { //#channel-example class MyProcessor extends AbstractProcessor { private final ActorRef destination; private final ActorRef channel; public MyProcessor() { this.destination = context().actorOf(Props.create(MyDestination.class)); this.channel = context().actorOf(Channel.props(), "myChannel"); receive(ReceiveBuilder. match(Persistent.class, p -> { Persistent out = p.withPayload("done " + p.payload()); channel.tell(Deliver.create(out, destination.path()), self()); }).build() ); } } class MyDestination extends AbstractActor { public MyDestination() { receive(ReceiveBuilder. match(ConfirmablePersistent.class, p -> { Object payload = p.payload(); Long sequenceNr = p.sequenceNr(); int redeliveries = p.redeliveries(); // ... p.confirm(); }).build() ); } } //#channel-example class MyProcessor2 extends AbstractProcessor { private final ActorRef destination; private final ActorRef channel; public MyProcessor2(ActorRef destination) { this.destination = context().actorOf(Props.create(MyDestination.class)); //#channel-id-override this.channel = context().actorOf(Channel.props("my-stable-channel-id")); //#channel-id-override //#channel-custom-settings context().actorOf( Channel.props(ChannelSettings.create() .withRedeliverInterval(Duration.create(30, TimeUnit.SECONDS)) .withRedeliverMax(15))); //#channel-custom-settings //#channel-custom-listener class MyListener extends AbstractActor { public MyListener() { receive(ReceiveBuilder. match(RedeliverFailure.class, r -> { Iterable<ConfirmablePersistent> messages = r.getMessages(); // ... }).build() ); } } final ActorRef myListener = context().actorOf(Props.create(MyListener.class)); context().actorOf(Channel.props( ChannelSettings.create().withRedeliverFailureListener(null))); //#channel-custom-listener receive(ReceiveBuilder. match(Persistent.class, p -> { Persistent out = p.withPayload("done " + p.payload()); channel.tell(Deliver.create(out, destination.path()), self()); //#channel-example-reply channel.tell(Deliver.create(out, sender().path()), self()); //#channel-example-reply }).build() ); } } }; static Object o4 = new Object() { //#save-snapshot class MyProcessor extends AbstractProcessor { private Object state; public MyProcessor() { receive(ReceiveBuilder. match(String.class, s -> s.equals("snap"), s -> saveSnapshot(state)). match(SaveSnapshotSuccess.class, ss -> { SnapshotMetadata metadata = ss.metadata(); // ... }). match(SaveSnapshotFailure.class, sf -> { SnapshotMetadata metadata = sf.metadata(); // ... }).build() ); } } //#save-snapshot }; static Object o5 = new Object() { //#snapshot-offer class MyProcessor extends AbstractProcessor { private Object state; public MyProcessor() { receive(ReceiveBuilder. match(SnapshotOffer.class, s -> { state = s.snapshot(); // ... }). match(Persistent.class, p -> {/* ...*/}).build() ); } } //#snapshot-offer class MyActor extends AbstractActor { ActorRef processor; public MyActor() { processor = context().actorOf(Props.create(MyProcessor.class)); receive(ReceiveBuilder. match(Object.class, o -> {/* ... */}).build() ); } private void recover() { //#snapshot-criteria processor.tell(Recover.create( SnapshotSelectionCriteria .create(457L, System.currentTimeMillis())), null); //#snapshot-criteria } } }; static Object o6 = new Object() { //#batch-write class MyProcessor extends AbstractProcessor { public MyProcessor() { receive(ReceiveBuilder. match(Persistent.class, p -> p.payload().equals("a"), p -> {/* ... */}). match(Persistent.class, p -> p.payload().equals("b"), p -> {/* ... */}).build() ); } } class Example { final ActorSystem system = ActorSystem.create("example"); final ActorRef processor = system.actorOf(Props.create(MyProcessor.class)); public void batchWrite() { processor.tell(PersistentBatch .create(asList(Persistent.create("a"), Persistent.create("b"))), null); } // ... } //#batch-write }; static Object o7 = new Object() { abstract class MyProcessor extends AbstractProcessor { ActorRef destination; public void foo() { //#persistent-channel-example final ActorRef channel = context().actorOf( PersistentChannel.props( PersistentChannelSettings.create() .withRedeliverInterval(Duration.create(30, TimeUnit.SECONDS)) .withRedeliverMax(15)), "myPersistentChannel"); channel.tell(Deliver.create(Persistent.create("example"), destination.path()), self()); //#persistent-channel-example //#persistent-channel-watermarks PersistentChannelSettings.create() .withPendingConfirmationsMax(10000) .withPendingConfirmationsMin(2000); //#persistent-channel-watermarks //#persistent-channel-reply PersistentChannelSettings.create().withReplyPersistent(true); //#persistent-channel-reply } } }; static Object o8 = new Object() { //#reliable-event-delivery class MyEventsourcedProcessor extends AbstractPersistentActor { private ActorRef destination; private ActorRef channel; public MyEventsourcedProcessor(ActorRef destination) { this.destination = destination; this.channel = context().actorOf(Channel.props(), "channel"); } @Override public String persistenceId() { return "my-stable-persistence-id"; } private void handleEvent(String event) { // update state // ... // reliably deliver events channel.tell(Deliver.create( Persistent.create(event, getCurrentPersistentMessage()), destination.path()), self()); } @Override public PartialFunction<Object, BoxedUnit> receiveRecover() { return ReceiveBuilder. match(String.class, this::handleEvent).build(); } @Override public PartialFunction<Object, BoxedUnit> receiveCommand() { return ReceiveBuilder. match(String.class, s -> s.equals("cmd"), s -> persist("evt", this::handleEvent)).build(); } } //#reliable-event-delivery }; static Object o9 = new Object() { //#persist-async class MyPersistentActor extends AbstractPersistentActor { @Override public String persistenceId() { return "my-stable-persistence-id"; } private void handleCommand(String c) { sender().tell(c, self()); persistAsync(String.format("evt-%s-1", c), e -> { sender().tell(e, self()); }); persistAsync(String.format("evt-%s-2", c), e -> { sender().tell(e, self()); }); } @Override public PartialFunction<Object, BoxedUnit> receiveRecover() { return ReceiveBuilder. match(String.class, this::handleCommand).build(); } @Override public PartialFunction<Object, BoxedUnit> receiveCommand() { return ReceiveBuilder. match(String.class, this::handleCommand).build(); } } //#persist-async public void usage() { final ActorSystem system = ActorSystem.create("example"); //#persist-async-usage final ActorRef processor = system.actorOf(Props.create(MyPersistentActor.class)); processor.tell("a", null); processor.tell("b", null); // possible order of received messages: // a // b // evt-a-1 // evt-a-2 // evt-b-1 // evt-b-2 //#persist-async-usage } }; static Object o10 = new Object() { //#defer class MyPersistentActor extends AbstractPersistentActor { @Override public String persistenceId() { return "my-stable-persistence-id"; } private void handleCommand(String c) { persistAsync(String.format("evt-%s-1", c), e -> { sender().tell(e, self()); }); persistAsync(String.format("evt-%s-2", c), e -> { sender().tell(e, self()); }); defer(String.format("evt-%s-3", c), e -> { sender().tell(e, self()); }); } @Override public PartialFunction<Object, BoxedUnit> receiveRecover() { return ReceiveBuilder. match(String.class, this::handleCommand).build(); } @Override public PartialFunction<Object, BoxedUnit> receiveCommand() { return ReceiveBuilder. match(String.class, this::handleCommand).build(); } } //#defer public void usage() { final ActorSystem system = ActorSystem.create("example"); final ActorRef sender = null; // your imaginary sender here //#defer-caller final ActorRef processor = system.actorOf(Props.create(MyPersistentActor.class)); processor.tell("a", sender); processor.tell("b", sender); // order of received messages: // a // b // evt-a-1 // evt-a-2 // evt-a-3 // evt-b-1 // evt-b-2 // evt-b-3 //#defer-caller } }; static Object o11 = new Object() { //#view class MyView extends AbstractPersistentView { @Override public String persistenceId() { return "some-persistence-id"; } @Override public String viewId() { return "some-persistence-id-view"; } public MyView() { receive(ReceiveBuilder. match(Object.class, p -> isPersistent(), persistent -> { // ... }).build() ); } } //#view public void usage() { final ActorSystem system = ActorSystem.create("example"); //#view-update final ActorRef view = system.actorOf(Props.create(MyView.class)); view.tell(Update.create(true), null); //#view-update } }; } Other Akka source code examplesHere is a short list of links related to this Akka LambdaPersistenceDocTest.java source code file: |
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