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/*
*
* 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.qpid.example.jmxexample;
import java.util.Set;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
/**
* Connects to a server and queries all info for tmp_* named queues, determines
* their message count, and if this is above a given threshold deletes the
* specified number of messages from the front of the queue
*/
public class DeleteMessagesFromTopOfTmp
{
/**
* Params:
* 0: host, e.g. myserver.mydomain.com
* 1: port, e.g. 8999
* 2: Number of messages to delete, e.g. 1000
* 3: Threshold MessageCount on queue required before deletion will be undertaken e.g. 5000
*/
public static void main(String[] args) throws Exception
{
if (args.length < 4)
{
System.out.println("Usage: ");
System.out.println("<host> <port> <numMsgsToDel> <minRequiredQueueMsgCount>");
return;
}
String host = args[0];
int port = Integer.parseInt(args[1]);
int numToDel = Integer.parseInt(args[2]);
int numRequired = Integer.parseInt(args[3]);
deleteFromTop(host, port, numToDel, numRequired);
}
private static void deleteFromTop(String host, int port,
int numMsgsToDel, int minRequiredQueueMsgCount) throws Exception
{
JMXConnector con = getJMXConnection(host, port);
MBeanServerConnection mbsc = con.getMBeanServerConnection();
// Gets all tmp_* queue MBean ObjectNames
Set<ObjectName> names = mbsc.queryNames(
new ObjectName("org.apache.qpid:type=VirtualHost.Queue,name=tmp_*,*"), null);
// Traverse objects and delete specified number of message if the min msg count is breached
for (ObjectName queueObjectName : names)
{
String queueName = queueObjectName.getKeyProperty("name");
System.out.println("Checking message count on queue: " + queueName);
long mc = (Integer) mbsc.getAttribute(queueObjectName, "MessageCount");
if(mc >= minRequiredQueueMsgCount)
{
System.out.println("MessageCount (" + mc + ") is above the specified threshold ("
+ minRequiredQueueMsgCount + ")");
System.out.println("Deleting first " + numMsgsToDel + " messages on queue: " + queueName);
int i;
for(i=0; i<numMsgsToDel; i++)
{
try
{
mbsc.invoke(queueObjectName,"deleteMessageFromTop",null,null);
}
catch(Exception e)
{
System.out.println("Exception whilst deleting message" + i +" from queue: " +e);
break;
}
}
}
else
{
System.out.println("MessageCount (" + mc + ") is below the specified threshold ("
+ minRequiredQueueMsgCount + ")");
System.out.println("Not deleting any messages on queue: " + queueName);
}
}
}
private static JMXConnector getJMXConnection(String host, int port) throws Exception
{
//Open JMX connection
JMXServiceURL jmxUrl = new JMXServiceURL("service:jmx:rmi:///jndi/rmi://" + host + ":" + port + "/jmxrmi");
JMXConnector con = JMXConnectorFactory.connect(jmxUrl);
return con;
}
}
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