a0a541eda7
- Provided new interfaces for akka-persistence to be usable directly through ReceiveBuilder/PartialFunction. Added a sample java project to showcase the usage of these API's with akka-persistence. - Fixed a minor comment block in javadoc code snippet. - Renamed java event persistor and fixed a documentation typo. - Put back java event persistence methods in UntypedEventsourcedProcessor and copied them into AbstractEventsourcedProcessor for the sake of clarity in javadocs. Also corrected some doc punctuations. - Documentation for akka-persistence java 8 lambda expressions support. - Moved code examples referred from within lambda-persistence.rst to java8 compatible sample project. - Removed remaining unwanted java8 compatible source files.
79 lines
2.6 KiB
Java
79 lines
2.6 KiB
Java
/**
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* Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
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*/
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package sample.persistence;
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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.pf.ReceiveBuilder;
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import akka.persistence.AbstractProcessor;
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import akka.persistence.Persistent;
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import akka.persistence.SnapshotOffer;
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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.ArrayList;
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public class SnapshotExample {
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public static class ExampleState implements Serializable {
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private final ArrayList<String> received;
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public ExampleState() {
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this(new ArrayList<String>());
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}
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public ExampleState(ArrayList<String> received) {
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this.received = received;
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}
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public ExampleState copy() {
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return new ExampleState(new ArrayList<String>(received));
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}
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public void update(String s) {
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received.add(s);
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}
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@Override
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public String toString() {
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return received.toString();
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}
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}
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public static class ExampleProcessor extends AbstractProcessor {
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private ExampleState state = new ExampleState();
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@Override public PartialFunction<Object, BoxedUnit> receive() {
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return ReceiveBuilder.
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match(Persistent.class, p -> state.update(String.format("%s-%d", p.payload(), p.sequenceNr()))).
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match(SnapshotOffer.class, s -> {
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ExampleState exState = (ExampleState) s.snapshot();
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System.out.println("offered state = " + exState);
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state = exState;
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}).
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match(String.class, s -> s.equals("print"), s -> System.out.println("current state = " + state)).
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match(String.class, s -> s.equals("snap"), s ->
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// IMPORTANT: create a copy of snapshot
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// because ExampleState is mutable !!!
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saveSnapshot(state.copy())).build();
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}
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}
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public static void main(String... args) throws Exception {
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final ActorSystem system = ActorSystem.create("example");
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final ActorRef processor = system.actorOf(Props.create(ExampleProcessor.class), "processor-3-java");
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processor.tell(Persistent.create("a"), null);
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processor.tell(Persistent.create("b"), null);
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processor.tell("snap", null);
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processor.tell(Persistent.create("c"), null);
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processor.tell(Persistent.create("d"), null);
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processor.tell("print", null);
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Thread.sleep(1000);
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system.shutdown();
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}
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}
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