// GPars - Groovy Parallel Systems
//
// Copyright © 2008-11 The original author or authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.codehaus.gpars.javademo.benchmark;
import groovyx.gpars.actor.Actor;
import groovyx.gpars.actor.DynamicDispatchActor;
import groovyx.gpars.group.DefaultPGroup;
import groovyx.gpars.group.PGroup;
import groovyx.gpars.scheduler.DefaultPool;
import org.junit.Test;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import static org.junit.Assert.assertEquals;
/**
* Creates 10000 chained Actors that are passing messages along. Messages are passed to the first actor and the messages are propagated
* to the others.
*
* @author Vaclav Pech, Lukas Krecan, Pavel Jetensky, Michal Franc
*/
@SuppressWarnings({"MagicNumber"})
public class ActorBenchmarkTest {
private static final int ACTORS = 10000;
private static final int MESSAGES = 500;
@Test
public void testBenchmark() throws Exception {
for (int index = 0; index <= 3; index++) {
final int concurrencyLevel = 20;
// All actors in this group share the same thread pool
final PGroup group = new DefaultPGroup(new DefaultPool(true, concurrencyLevel));
final long t1 = System.currentTimeMillis();
// With each message received counter is decreased by the actors
final int latchCount = ACTORS * MESSAGES;
final CountDownLatch cdl = new CountDownLatch(latchCount);
Actor lastActor = null;
// Create and chain actors (backwards - the lastActor will be first)
for (int i = 0; i < ACTORS; i++) {
final Actor actor = new MessagePassingActor(lastActor, cdl);
actor.setParallelGroup(group);
lastActor = actor;
actor.start();
}
for (int i = 0; i < MESSAGES; i++) {
lastActor.send("Hi");
}
cdl.await(1000, TimeUnit.SECONDS);
group.shutdown();
final long t2 = System.currentTimeMillis();
System.out.println("Time to process " + latchCount + " messages: " + (t2 - t1) + " ms");
assertEquals("Latch has not been decreased to 0", 0, cdl.getCount());
}
}
/**
* Actor implementation.
*/
public static class MessagePassingActor extends DynamicDispatchActor {
private final Actor soFarLast;
private final CountDownLatch cdl;
MessagePassingActor(final Actor soFarLast, final CountDownLatch cdl) {
this.soFarLast = soFarLast;
this.cdl = cdl;
}
/**
* Pass message to next actor and decrease the latch
*
* @param msg
* @return
*/
Object onMessage(final Object msg) {
if (soFarLast != null) soFarLast.send(msg);
cdl.countDown();
return null;
}
}
}