Tomcat example source code file (NamingService.java)

This example Tomcat source code file (NamingService.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

attributechangenotification, exception, integer, integer, management, name, name, naming, objectname, started, state, stopped, stopped, stopping, string, string

The Tomcat NamingService.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.naming;

import javax.naming.Context;
import javax.management.NotificationBroadcasterSupport;
import javax.management.ObjectName;
import javax.management.MBeanServer;
import javax.management.MBeanRegistration;
import javax.management.AttributeChangeNotification;
import javax.management.Notification;

/**
 * Implementation of the NamingService JMX MBean.
 * 
 * @author <a href="mailto:remm@apache.org">Remy Maucherat
 * @version $Revision: 467222 $
 */

public final class NamingService
    extends NotificationBroadcasterSupport
    implements NamingServiceMBean, MBeanRegistration {
    
    
    // ----------------------------------------------------- Instance Variables
    
    
    /**
     * Status of the Slide domain.
     */
    private int state = STOPPED;
    
    
    /**
     * Notification sequence number.
     */
    private long sequenceNumber = 0;
    
    
    /**
     * Old URL packages value.
     */
    private String oldUrlValue = "";
    
    
    /**
     * Old initial context value.
     */
    private String oldIcValue = "";
    
    
    // ---------------------------------------------- MBeanRegistration Methods
    
    
    public ObjectName preRegister(MBeanServer server, ObjectName name)
        throws Exception {
        return new ObjectName(OBJECT_NAME);
    }
    
    
    public void postRegister(Boolean registrationDone) {
        if (!registrationDone.booleanValue())
            destroy();
    }
    
    
    public void preDeregister()
        throws Exception {
    }
    
    
    public void postDeregister() {
        destroy();
    }
    
    
    // ----------------------------------------------------- SlideMBean Methods
    
    
    /**
     * Retruns the Catalina component name.
     */
    public String getName() {
        return NAME;
    }
    
    
    /**
     * Returns the state.
     */
    public int getState() {
        return state;
    }
    
    
    /**
     * Returns a String representation of the state.
     */
    public String getStateString() {
        return states[state];
    }
    
    
    /**
     * Start the servlet container.
     */
    public void start()
        throws Exception {
        
        Notification notification = null;
        
        if (state != STOPPED)
            return;
        
        state = STARTING;
        
        // Notifying the MBEan server that we're starting
        
        notification = new AttributeChangeNotification
            (this, sequenceNumber++, System.currentTimeMillis(), 
             "Starting " + NAME, "State", "java.lang.Integer", 
             new Integer(STOPPED), new Integer(STARTING));
        sendNotification(notification);
        
        try {
            
            String value = "org.apache.naming";
            String oldValue = System.getProperty(Context.URL_PKG_PREFIXES);
            if (oldValue != null) {
                oldUrlValue = oldValue;
                value = oldValue + ":" + value;
            }
            System.setProperty(Context.URL_PKG_PREFIXES, value);
            
            oldValue = System.getProperty(Context.INITIAL_CONTEXT_FACTORY);
            if ((oldValue != null) && (oldValue.length() > 0)) {
                oldIcValue = oldValue;
            } else {
                System.setProperty(Context.INITIAL_CONTEXT_FACTORY,
                                   Constants.Package 
                                   + ".java.javaURLContextFactory");
            }
            
        } catch (Throwable t) {
            state = STOPPED;
            notification = new AttributeChangeNotification
                (this, sequenceNumber++, System.currentTimeMillis(), 
                 "Stopped " + NAME, "State", "java.lang.Integer", 
                 new Integer(STARTING), new Integer(STOPPED));
            sendNotification(notification);
        }
        
        state = STARTED;
        notification = new AttributeChangeNotification
            (this, sequenceNumber++, System.currentTimeMillis(), 
             "Started " + NAME, "State", "java.lang.Integer", 
             new Integer(STARTING), new Integer(STARTED));
        sendNotification(notification);
        
    }
    
    
    /**
     * Stop the servlet container.
     */
    public void stop() {
        
        Notification notification = null;
        
        if (state != STARTED)
            return;
        
        state = STOPPING;
        
        notification = new AttributeChangeNotification
            (this, sequenceNumber++, System.currentTimeMillis(), 
             "Stopping " + NAME, "State", "java.lang.Integer", 
             new Integer(STARTED), new Integer(STOPPING));
        sendNotification(notification);
        
        try {
            
            System.setProperty(Context.URL_PKG_PREFIXES, oldUrlValue);
            System.setProperty(Context.INITIAL_CONTEXT_FACTORY, oldIcValue);
            
        } catch (Throwable t) {
            
            // FIXME
            t.printStackTrace();
            
        }
        
        state = STOPPED;
        
        notification = new AttributeChangeNotification
            (this, sequenceNumber++, System.currentTimeMillis(), 
             "Stopped " + NAME, "State", "java.lang.Integer", 
             new Integer(STOPPING), new Integer(STOPPED));
        sendNotification(notification);
        
    }
    
    
    /**
     * Destroy servlet container (if any is running).
     */
    public void destroy() {
        
        if (getState() != STOPPED)
            stop();
        
    }
    
    
}