| package org.apache.qpid; |
| /* |
| * |
| * 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. |
| * |
| */ |
| |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.apache.qpid.transport.MessageTransfer; |
| |
| |
| public class ToyExchange |
| { |
| final static String DIRECT = "amq.direct"; |
| final static String TOPIC = "amq.topic"; |
| |
| private Map<String,List<LinkedBlockingQueue<MessageTransfer>>> directEx = new HashMap<String,List<LinkedBlockingQueue<MessageTransfer>>>(); |
| private Map<String,List<LinkedBlockingQueue<MessageTransfer>>> topicEx = new HashMap<String,List<LinkedBlockingQueue<MessageTransfer>>>(); |
| private Map<String,LinkedBlockingQueue<MessageTransfer>> queues = new HashMap<String,LinkedBlockingQueue<MessageTransfer>>(); |
| |
| public void createQueue(String name) |
| { |
| queues.put(name, new LinkedBlockingQueue<MessageTransfer>()); |
| } |
| |
| public LinkedBlockingQueue<MessageTransfer> getQueue(String name) |
| { |
| return queues.get(name); |
| } |
| |
| public void bindQueue(String type,String binding,String queueName) |
| { |
| LinkedBlockingQueue<MessageTransfer> queue = queues.get(queueName); |
| binding = normalizeKey(binding); |
| if(DIRECT.equals(type)) |
| { |
| |
| if (directEx.containsKey(binding)) |
| { |
| List<LinkedBlockingQueue<MessageTransfer>> list = directEx.get(binding); |
| list.add(queue); |
| } |
| else |
| { |
| List<LinkedBlockingQueue<MessageTransfer>> list = new LinkedList<LinkedBlockingQueue<MessageTransfer>>(); |
| list.add(queue); |
| directEx.put(binding,list); |
| } |
| } |
| else |
| { |
| if (topicEx.containsKey(binding)) |
| { |
| List<LinkedBlockingQueue<MessageTransfer>> list = topicEx.get(binding); |
| list.add(queue); |
| } |
| else |
| { |
| List<LinkedBlockingQueue<MessageTransfer>> list = new LinkedList<LinkedBlockingQueue<MessageTransfer>>(); |
| list.add(queue); |
| topicEx.put(binding,list); |
| } |
| } |
| } |
| |
| public boolean route(String dest, String routingKey, MessageTransfer msg) |
| { |
| List<LinkedBlockingQueue<MessageTransfer>> queues; |
| if(DIRECT.equals(dest)) |
| { |
| queues = directEx.get(routingKey); |
| } |
| else |
| { |
| queues = matchWildCard(routingKey); |
| } |
| if(queues != null && queues.size()>0) |
| { |
| System.out.println("Message stored in " + queues.size() + " queues"); |
| storeMessage(msg,queues); |
| return true; |
| } |
| else |
| { |
| System.out.println("Message unroutable " + msg); |
| return false; |
| } |
| } |
| |
| private String normalizeKey(String routingKey) |
| { |
| if(routingKey.indexOf(".*")>1) |
| { |
| return routingKey.substring(0,routingKey.indexOf(".*")); |
| } |
| else |
| { |
| return routingKey; |
| } |
| } |
| |
| private List<LinkedBlockingQueue<MessageTransfer>> matchWildCard(String routingKey) |
| { |
| List<LinkedBlockingQueue<MessageTransfer>> selected = new ArrayList<LinkedBlockingQueue<MessageTransfer>>(); |
| |
| for(String key: topicEx.keySet()) |
| { |
| Pattern p = Pattern.compile(key); |
| Matcher m = p.matcher(routingKey); |
| if (m.find()) |
| { |
| for(LinkedBlockingQueue<MessageTransfer> queue : topicEx.get(key)) |
| { |
| selected.add(queue); |
| } |
| } |
| } |
| |
| return selected; |
| } |
| |
| private void storeMessage(MessageTransfer msg,List<LinkedBlockingQueue<MessageTransfer>> selected) |
| { |
| for(LinkedBlockingQueue<MessageTransfer> queue : selected) |
| { |
| queue.offer(msg); |
| } |
| } |
| |
| } |