39 lines
1 KiB
Java
39 lines
1 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 java.util.Set;
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import scala.concurrent.stm.*;
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public class FriendlyCounter extends UntypedTransactor {
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Ref<Integer> count = Stm.ref(0);
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@Override public Set<SendTo> coordinate(Object message) {
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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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return include(increment.getFriend(), new Increment());
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}
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return nobody();
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}
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public void atomically(InTxn txn, Object message) {
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if (message instanceof Increment) {
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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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}
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@Override public boolean normally(Object message) {
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if ("GetCount".equals(message)) {
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getSender().tell(count.single().get());
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return true;
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} else return false;
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}
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}
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//#class
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