| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.cloudstack.framework.messagebus; |
| |
| import org.apache.log4j.Logger; |
| |
| public class MessageDetector implements MessageSubscriber { |
| private static final Logger s_logger = Logger.getLogger(MessageDetector.class); |
| |
| private MessageBus _messageBus; |
| private String[] _subjects; |
| |
| public MessageDetector() { |
| _messageBus = null; |
| _subjects = null; |
| } |
| |
| public void waitAny(long timeoutInMilliseconds) { |
| if (timeoutInMilliseconds < 100) { |
| s_logger.warn("waitAny is passed with a too short time-out interval. " + timeoutInMilliseconds + "ms"); |
| timeoutInMilliseconds = 100; |
| } |
| |
| synchronized (this) { |
| try { |
| wait(timeoutInMilliseconds); |
| } catch (InterruptedException e) { |
| s_logger.debug("[ignored] interrupted while waiting on any message."); |
| } |
| } |
| } |
| |
| public void open(MessageBus messageBus, String[] subjects) { |
| assert (messageBus != null); |
| assert (subjects != null); |
| |
| _messageBus = messageBus; |
| _subjects = subjects; |
| |
| if (subjects != null) { |
| for (String subject : subjects) { |
| messageBus.subscribe(subject, this); |
| } |
| } |
| } |
| |
| public void close() { |
| if (_subjects != null) { |
| assert (_messageBus != null); |
| |
| for (String subject : _subjects) { |
| _messageBus.unsubscribe(subject, this); |
| } |
| } |
| } |
| |
| @Override |
| public void onPublishMessage(String senderAddress, String subject, Object args) { |
| if (subjectMatched(subject)) { |
| synchronized (this) { |
| notifyAll(); |
| } |
| } |
| } |
| |
| private boolean subjectMatched(String subject) { |
| if (_subjects != null) { |
| for (String sub : _subjects) { |
| if (sub.equals(subject)) |
| return true; |
| } |
| } |
| return false; |
| } |
| } |