/*
* 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.catalina.ant.jmx;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;
import org.apache.tools.ant.BuildException;
/**
* Access <em>JMX</em> JSR 160 MBeans Server.
* <ul>
* <li>Get Mbeans attributes</li>
* <li>Show Get result as Ant console log</li>
* <li>Bind Get result as Ant properties</li>
* </ul>
* <p>
* Examples:
* <br/>
* Get a Mbean IDataSender attribute nrOfRequests and create a new ant property <em>IDataSender.9025.nrOfRequests</em>
* <pre>
* <jmx:get
* ref="jmx.server"
* name="Catalina:type=IDataSender,host=localhost,senderAddress=192.168.1.2,senderPort=9025"
* attribute="nrOfRequests"
* resultproperty="IDataSender.9025.nrOfRequests"
* echo="false">
* />
* </pre>
* </p>
* <p>
* First call to a remote MBeanserver save the JMXConnection a referenz <em>jmx.server</em>
* </p>
* These tasks require Ant 1.6 or later interface.
*
* @author Peter Rossbach
*
* @since 5.5.10
*/
public class JMXAccessorGetTask extends JMXAccessorTask {
// ----------------------------------------------------- Instance Variables
private String attribute;
// ----------------------------------------------------- Instance Info
/**
* Descriptive information describing this implementation.
*/
private static final String info = "org.apache.catalina.ant.JMXAccessorGetTask/1.0";
/**
* Return descriptive information about this implementation and the
* corresponding version number, in the format
* <code><description>/<version></code>.
*/
public String getInfo() {
return (info);
}
// ------------------------------------------------------------- Properties
/**
* @return Returns the attribute.
*/
public String getAttribute() {
return attribute;
}
/**
* @param attribute The attribute to set.
*/
public void setAttribute(String attribute) {
this.attribute = attribute;
}
// ------------------------------------------------------ protected Methods
/**
* Execute the specified command, based on the configured properties. The
* input stream will be closed upon completion of this task, whether it was
* executed successfully or not.
*
* @exception BuildException
* if an error occurs
*/
public String jmxExecute(MBeanServerConnection jmxServerConnection)
throws Exception {
if (getName() == null) {
throw new BuildException("Must specify a 'name'");
}
if ((attribute == null)) {
throw new BuildException(
"Must specify a 'attribute' for get");
}
return jmxGet(jmxServerConnection, getName());
}
/**
* @param jmxServerConnection
* @param name
* @return The value of the given named attribute
* @throws Exception
*/
protected String jmxGet(MBeanServerConnection jmxServerConnection,String name) throws Exception {
String error = null;
if(isEcho()) {
handleOutput("MBean " + name + " get attribute " + attribute );
}
Object result = jmxServerConnection.getAttribute(
new ObjectName(name), attribute);
if (result != null) {
echoResult(attribute,result);
createProperty(result);
} else
error = "Attribute " + attribute + " is empty";
return error;
}
}