75 lines
2.4 KiB
Java
75 lines
2.4 KiB
Java
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/**
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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.*;
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import akka.event.EventStreamSpec;
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import akka.japi.Function;
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import akka.japi.Procedure;
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import akka.pattern.BackoffSupervisor;
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import akka.persistence.*;
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import akka.persistence.query.*;
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import akka.persistence.query.javadsl.ReadJournal;
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import akka.stream.javadsl.Source;
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import akka.util.Timeout;
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import docs.persistence.query.MyEventsByTagPublisher;
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import scala.collection.Seq;
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import scala.concurrent.duration.Duration;
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import scala.concurrent.duration.FiniteDuration;
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import scala.runtime.BoxedUnit;
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import java.io.Serializable;
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import java.util.Arrays;
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import java.util.concurrent.TimeUnit;
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public class PersistenceQueryDocTest {
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final Timeout timeout = Timeout.durationToTimeout(FiniteDuration.create(3, TimeUnit.SECONDS));
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//#my-read-journal
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class MyReadJournal implements ReadJournal {
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private final ExtendedActorSystem system;
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public MyReadJournal(ExtendedActorSystem system) {
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this.system = system;
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}
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final FiniteDuration defaultRefreshInterval = FiniteDuration.create(3, TimeUnit.SECONDS);
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@SuppressWarnings("unchecked")
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public <T, M> Source<T, M> query(Query<T, M> q, Hint... hints) {
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if (q instanceof EventsByTag) {
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final EventsByTag eventsByTag = (EventsByTag) q;
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final String tag = eventsByTag.tag();
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long offset = eventsByTag.offset();
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final Props props = MyEventsByTagPublisher.props(tag, offset, refreshInterval(hints));
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return (Source<T, M>) Source.<EventEnvelope>actorPublisher(props)
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.mapMaterializedValue(noMaterializedValue());
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} else {
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// unsuported
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return Source.<T>failed(
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new UnsupportedOperationException(
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"Query $unsupported not supported by " + getClass().getName()))
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.mapMaterializedValue(noMaterializedValue());
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}
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}
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private FiniteDuration refreshInterval(Hint[] hints) {
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FiniteDuration ret = defaultRefreshInterval;
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for (Hint hint : hints)
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if (hint instanceof RefreshInterval)
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ret = ((RefreshInterval) hint).interval();
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return ret;
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}
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private <I, M> akka.japi.function.Function<I, M> noMaterializedValue () {
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return param -> (M) null;
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}
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}
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//#my-read-journal
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}
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