/* * Copyright (c) 2013 Mike Heath. All rights reserved. * * 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 cloudeventbus.server; import cloudeventbus.Subject; import cloudeventbus.hub.Hub; import java.util.List; import java.util.concurrent.CopyOnWriteArrayList; /** * This hub is responsible for distributing messages to all client connections and forwarding messages to peer servers. * There should only be one instance of this class per server. * * @author Mike Heath <elcapo@gmail.com> */ public class GlobalHub { private final List<Hub> localHubs = new CopyOnWriteArrayList<>(); private final List<Hub> remoteHubs = new CopyOnWriteArrayList<>(); /** * Use this method to distribute messages to just the local subscribers. * * @param subject the message subject * @param replySubject the subject replies should be sent to * @param body the body of the message */ public void publish(Subject subject, Subject replySubject, String body) { for (Hub hub : localHubs) { hub.publish(subject, replySubject, body); } } /** * Use this method to distribute messages locally as well as to peer servers. * * @param subject the message subject * @param replySubject the subject replies should be sent to * @param body the body of the message */ public void broadcast(Subject subject, Subject replySubject, String body) { for (Hub hub : remoteHubs) { hub.publish(subject, replySubject, body); } publish(subject, replySubject, body); } public void addLocalHub(Hub hub) { localHubs.add(hub); } public void addRemoteHub(Hub hub) { remoteHubs.add(hub); } }