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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);
}
}
}
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