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Tomcat example source code file (JMXAccessorSetTask.java)

This example Tomcat source code file (JMXAccessorSetTask.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

attribute, buildexception, exception, exception, jmxaccessorsettask, management, mbeaninfo, mbeanserverconnection, must, must, object, objectname, objectname, string, string

The Tomcat JMXAccessorSetTask.java source code

/*
 * 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.Attribute;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServerConnection;
import javax.management.ObjectName;

import org.apache.tools.ant.BuildException;


/**
 * Access <em>JMX JSR 160 MBeans Server. 
 * <ul>
 * <li>Get Mbeans attributes
 * <li>Show Get result as Ant console log
 * <li>Bind Get result as Ant properties
 * </ul>
 * <p>
 * Examples:
 * Set a Mbean Manager attribute maxActiveSessions.
 * Set this attribute with fresh jmx connection without save reference 
 * <pre>
 *   <jmx:set
 *           host="127.0.0.1"
 *           port="9014"
 *           ref=""
 *           name="Catalina:type=Manager,path="/ClusterTest",host=localhost" 
 *           attribute="maxActiveSessions"
 *           value="100"
 *           type="int"
 *           echo="false">
 *       />
 * </pre>
 * </p>
 * <p>
 * First call to a remote MBeanserver save the JMXConnection a referenz <em>jmx.server
 * </p>
 * These tasks require Ant 1.6 or later interface.
 *
 * @author Peter Rossbach
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 * @since 5.5.10
 */

public class JMXAccessorSetTask extends JMXAccessorTask {

    // ----------------------------------------------------- Instance Variables

    private String attribute;
    private String value;
    private String type;
    private boolean convert = false ;
    
    // ----------------------------------------------------- Instance Info

    /**
     * Descriptive information describing this implementation.
     */
    private static final String info = "org.apache.catalina.ant.JMXAccessorSetTask/1.0";

    /**
     * Return descriptive information about this implementation and the
     * corresponding version number, in the format
     * <code><description>/<version>.
     */
    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;
    }
    
    /**
     * @return Returns the value.
     */
    public String getValue() {
        return value;
    }
    /**
     * @param value The value to set.
     */
    public void setValue(String value) {
        this.value = value;
    }
    
    
    /**
     * @return Returns the type.
     */
    public String getType() {
        return type;
    }
    
    /**
     * @param valueType The type to set.
     */
    public void setType(String valueType) {
        this.type = valueType;
    }
 
 
    /**
     * @return Returns the convert.
     */
    public boolean isConvert() {
        return convert;
    }
    /**
     * @param convert The convert to set.
     */
    public void setConvert(boolean convert) {
        this.convert = convert;
    }
    // ------------------------------------------------------ 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 Exception
     *                if an error occurs
     */
    public String jmxExecute(MBeanServerConnection jmxServerConnection)
        throws Exception {

        if (getName() == null) {
            throw new BuildException("Must specify a 'name'");
        }
        if ((attribute == null || value == null)) {
            throw new BuildException(
                    "Must specify a 'attribute' and 'value' for set");
        }
        return  jmxSet(jmxServerConnection, getName());
     }

    /**
     * @param jmxServerConnection
     * @param name
     * @throws Exception
     */
    protected String jmxSet(MBeanServerConnection jmxServerConnection,
            String name) throws Exception {
        Object realValue;
        if (type != null) {
            realValue = convertStringToType(value, type);
        } else {
            if (isConvert()) {
                String mType = getMBeanAttributeType(jmxServerConnection, name,
                        attribute);
                realValue = convertStringToType(value, mType);
            } else
                realValue = value;
        }
        jmxServerConnection.setAttribute(new ObjectName(name), new Attribute(
                attribute, realValue));
        return null;
    }
    


    /**
     * Get MBean Attriute from Mbean Server
     * @param jmxServerConnection
     * @param name
     * @param attribute
     * @return The type
     * @throws Exception
     */
    protected String getMBeanAttributeType(
            MBeanServerConnection jmxServerConnection,
            String name,
            String attribute) throws Exception {
        ObjectName oname = new ObjectName(name);
        String mattrType = null;
        MBeanInfo minfo = jmxServerConnection.getMBeanInfo(oname);
        MBeanAttributeInfo attrs[] = minfo.getAttributes();
        if (attrs != null) {
            for (int i = 0; mattrType == null && i < attrs.length; i++) {
                if (attribute.equals(attrs[i].getName()))
                    mattrType = attrs[i].getType();
            }
        }
        return mattrType;
    }
 }

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat JMXAccessorSetTask.java source code file:

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