cbe5dd2cf5
Previously know as [patriknw/akka-data-replication](https://github.com/patriknw/akka-data-replication), which was originally inspired by [jboner/akka-crdt](https://github.com/jboner/akka-crdt). The functionality is very similar to akka-data-replication 0.11. Here is a list of the most important changes: * The package name changed to `akka.cluster.ddata` * The extension was renamed to `DistributedData` * The keys changed from strings to classes with unique identifiers and type information of the data values, e.g. `ORSetKey[Int]("set2")` * The optional read consistency parameter was removed from the `Update` message. If you need to read from other replicas before performing the update you have to first send a `Get` message and then continue with the ``Update`` when the ``GetSuccess`` is received. * `BigInt` is used in `GCounter` and `PNCounter` instead of `Long` * Improvements of java api * Better documentation
95 lines
2.9 KiB
Java
95 lines
2.9 KiB
Java
/**
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* Copyright (C) 2015 Typesafe Inc. <http://www.typesafe.com>
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*/
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package docs.ddata;
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//#data-bot
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import static java.util.concurrent.TimeUnit.SECONDS;
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import scala.concurrent.duration.Duration;
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import scala.concurrent.forkjoin.ThreadLocalRandom;
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import akka.actor.AbstractActor;
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import akka.actor.ActorRef;
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import akka.actor.Cancellable;
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import akka.cluster.Cluster;
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import akka.cluster.ddata.DistributedData;
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import akka.cluster.ddata.Key;
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import akka.cluster.ddata.ORSet;
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import akka.cluster.ddata.ORSetKey;
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import akka.cluster.ddata.Replicator;
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import akka.cluster.ddata.Replicator.Changed;
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import akka.cluster.ddata.Replicator.Subscribe;
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import akka.cluster.ddata.Replicator.Update;
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import akka.cluster.ddata.Replicator.UpdateResponse;
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import akka.event.Logging;
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import akka.event.LoggingAdapter;
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import akka.japi.pf.ReceiveBuilder;
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public class DataBot extends AbstractActor {
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private static final String TICK = "tick";
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private final LoggingAdapter log = Logging.getLogger(context().system(), this);
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private final ActorRef replicator =
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DistributedData.get(context().system()).replicator();
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private final Cluster node = Cluster.get(context().system());
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private final Cancellable tickTask = context().system().scheduler().schedule(
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Duration.create(5, SECONDS), Duration.create(5, SECONDS), self(), TICK,
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context().dispatcher(), self());
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private final Key<ORSet<String>> dataKey = ORSetKey.create("key");
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public DataBot() {
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receive(ReceiveBuilder.
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match(String.class, a -> a.equals(TICK), a -> {
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String s = String.valueOf((char) ThreadLocalRandom.current().nextInt(97, 123));
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if (ThreadLocalRandom.current().nextBoolean()) {
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// add
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log.info("Adding: {}", s);
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Update<ORSet<String>> update = new Update<>(
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dataKey,
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ORSet.create(),
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Replicator.writeLocal(),
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curr -> curr.add(node, s));
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replicator.tell(update, self());
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} else {
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// remove
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log.info("Removing: {}", s);
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Update<ORSet<String>> update = new Update<>(
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dataKey,
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ORSet.create(),
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Replicator.writeLocal(),
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curr -> curr.remove(node, s));
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replicator.tell(update, self());
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}
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}).
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match(UpdateResponse.class, r -> {
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// ignore
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}).
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match(Changed.class, c -> c.key().equals(dataKey), c -> {
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@SuppressWarnings("unchecked")
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Changed<ORSet<String>> c2 = c;
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ORSet<String> data = c2.dataValue();
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log.info("Current elements: {}", data.getElements());
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}).
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matchAny(o -> log.info("received unknown message")).build()
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);
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}
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@Override
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public void preStart() {
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Subscribe<ORSet<String>> subscribe = new Subscribe<>(dataKey, self());
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replicator.tell(subscribe, ActorRef.noSender());
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}
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@Override
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public void postStop(){
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tickTask.cancel();
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}
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}
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//#data-bot
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