/*
* JBoss, Home of Professional Open Source
* Copyright 2014, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.jboss.weld.tests.event.async.complex;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Event;
import javax.enterprise.event.Observes;
import javax.inject.Inject;
/**
* Splits the work and delegates it to workers. In addition, it aggregates the result.
*
* @author Jozef Hartinger
*
*/
@ApplicationScoped
public class Master {
@Inject
private Event<Work> event;
@Inject
private Event<PiApproximation> resultEvent;
private long start;
private double pi;
private int pendingMessages;
public synchronized void compute(CalculationConfiguration configuration) {
this.pendingMessages = configuration.getNumberOfMessages();
start = System.currentTimeMillis();
for (int i = 0; i < configuration.getNumberOfMessages(); i++) {
event.fireAsync(new Work(i, configuration.getNumberOfElements()));
}
}
public synchronized void receiveResults(@Observes Result result) {
pi += result.getValue();
pendingMessages--;
if (pendingMessages == 0) {
resultEvent.fire(new PiApproximation(pi, System.currentTimeMillis() - start));
}
}
}