/*
* Copyright (C) 2013 Red Hat, Inc. and/or its affiliates.
*
* 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.errai.demo.mobile.server;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Event;
import javax.enterprise.event.Observes;
import javax.inject.Inject;
import org.jboss.errai.demo.mobile.client.shared.AllClientOrientations;
import org.jboss.errai.demo.mobile.client.shared.ClientOrientationEvent;
import org.jboss.errai.demo.mobile.client.shared.Disconnected;
import org.jboss.errai.demo.mobile.client.shared.Ongoing;
/**
* Acts like a communications satellite in orbit over the attached clients: receives the stream of
* orientation events from all attached clients, aggregates them, and relays them back to the
* clients.
*
* @author Jonathan Fuerth <jfuerth@gmail.com>
*/
@ApplicationScoped
public class OrientationDataSatellite {
private final Map<String, ClientOrientationEvent> clientOrientations =
new ConcurrentHashMap<String, ClientOrientationEvent>();
@Inject
private Event<AllClientOrientations> orientationEventSrc;
@Inject
@Disconnected
private Event<ClientOrientationEvent> disconnectEventSrc;
private final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
public void onClientOrientationChange(@Observes @Ongoing ClientOrientationEvent e) {
clientOrientations.put(e.getClientId(), e);
}
@PostConstruct
public void startRedistributionService() {
executor.scheduleWithFixedDelay(new Runnable() {
@Override
public void run() {
List<ClientOrientationEvent> clientOrientationList =
new ArrayList<ClientOrientationEvent>(clientOrientations.values());
orientationEventSrc.fire(new AllClientOrientations(clientOrientationList));
// Notify everyone about clients who have gone away
long cutoffTime = System.currentTimeMillis() - 2000;
Iterator<Map.Entry<String, ClientOrientationEvent>> it = clientOrientations.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, ClientOrientationEvent> entry = it.next();
if (entry.getValue().getTimestamp() < cutoffTime) {
it.remove();
disconnectEventSrc.fire(entry.getValue());
}
}
}
}, 1000, 250, TimeUnit.MILLISECONDS);
}
@PreDestroy
public void stopRedistributionService() {
executor.shutdown();
}
}