83 lines
No EOL
2.7 KiB
Java
83 lines
No EOL
2.7 KiB
Java
/**
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* Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
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*/
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package docs.circuitbreaker;
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//#imports1
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import akka.actor.UntypedActor;
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import scala.concurrent.Future;
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import akka.event.LoggingAdapter;
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import scala.concurrent.util.Duration;
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import akka.pattern.CircuitBreaker;
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import akka.event.Logging;
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import static akka.dispatch.Futures.future;
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import java.util.concurrent.Callable;
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//#imports1
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//#circuit-breaker-initialization
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public class DangerousJavaActor extends UntypedActor {
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private final CircuitBreaker breaker;
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private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);
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public DangerousJavaActor() {
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this.breaker = new CircuitBreaker(
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getContext().dispatcher(), getContext().system().scheduler(),
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5, Duration.create(10, "s"), Duration.create(1, "m"))
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.onOpen(new Callable<Object>() {
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public Object call() throws Exception {
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notifyMeOnOpen();
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return null;
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}
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});
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}
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public void notifyMeOnOpen() {
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log.warning("My CircuitBreaker is now open, and will not close for one minute");
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}
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//#circuit-breaker-initialization
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//#circuit-breaker-usage
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public String dangerousCall() {
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return "This really isn't that dangerous of a call after all";
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}
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@Override
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public void onReceive(Object message) {
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if (message instanceof String) {
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String m = (String) message;
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if ("is my middle name".equals(m)) {
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final Future<String> f = future(
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new Callable<String>() {
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public String call() {
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return dangerousCall();
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}
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}, getContext().dispatcher());
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getSender().tell(breaker
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.callWithCircuitBreaker(
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new Callable<Future<String>>() {
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public Future<String> call() throws Exception {
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return f;
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}
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}), getSelf());
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}
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if ("block for me".equals(m)) {
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getSender().tell(breaker
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.callWithSyncCircuitBreaker(
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new Callable<String>() {
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@Override
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public String call() throws Exception {
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return dangerousCall();
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}
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}), getSelf());
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}
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}
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}
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//#circuit-breaker-usage
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} |