42 lines
1.3 KiB
Java
42 lines
1.3 KiB
Java
/**
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* Copyright (C) 2009-2011 Typesafe Inc. <http://www.typesafe.com>
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*/
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package akka.docs.transactor;
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//#class
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import akka.actor.*;
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import akka.transactor.*;
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import scala.concurrent.stm.*;
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public class CoordinatedCounter extends UntypedActor {
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private Ref<Integer> count = Stm.ref(0);
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private void increment(InTxn txn) {
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Integer newValue = count.get(txn) + 1;
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count.set(newValue, txn);
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}
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public void onReceive(Object incoming) throws Exception {
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if (incoming instanceof Coordinated) {
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Coordinated coordinated = (Coordinated) incoming;
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Object message = coordinated.getMessage();
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if (message instanceof Increment) {
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Increment increment = (Increment) message;
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if (increment.hasFriend()) {
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increment.getFriend().tell(coordinated.coordinate(new Increment()));
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}
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coordinated.atomic(new Atomically() {
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public void atomically(InTxn txn) {
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increment(txn);
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}
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});
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}
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} else if ("GetCount".equals(incoming)) {
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getSender().tell(count.single().get());
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} else {
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unhandled(incoming);
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}
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}
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}
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//#class
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