Glassfish example source code file (ServerLifecycleModule.java)

This example Glassfish source code file (ServerLifecycleModule.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 - Glassfish tags/keywords

classloader, exception, exception, io, lifecycle, lifecyclelistener, lifecyclelistener, log, logging, net, network, properties, serverlifecycleexception, serverlifecycleexception, serverlifecyclemodule, string, string, stringbuffer, treating, util

The Glassfish ServerLifecycleModule.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.v3.server;

import java.net.URLClassLoader;
import java.net.URL;
import java.util.logging.Logger;
import java.util.logging.Level;
import java.util.Properties;
import java.util.List;
import java.io.File;

import com.sun.appserv.server.ServerLifecycleException;
import com.sun.appserv.server.LifecycleEventContext;
import com.sun.appserv.server.LifecycleEvent;
import com.sun.appserv.server.LifecycleListener;
import com.sun.logging.LogDomains;

import org.glassfish.loader.util.ASClassLoaderUtil;
import org.glassfish.internal.api.ServerContext;
import com.sun.enterprise.util.LocalStringManagerImpl;

/**
 * @author Sridatta Viswanath
 */

public final class ServerLifecycleModule {
    
    private LifecycleListener slcl;
    private String name;
    private String className;
    private String classpath;
    private int loadOrder;
    private boolean isFatal = false;
    private String statusMsg = "OK";
    
    private ServerContext ctx;
    private LifecycleEventContext leContext;
    private ClassLoader urlClassLoader;
    private Properties props = new Properties();

    private static Logger _logger = null;
    private static boolean _isTraceEnabled = false;

    private final static String LIFECYCLE_PREFIX = "lifecycle_"; 

    final private static LocalStringManagerImpl localStrings = new LocalStringManagerImpl(ServerLifecycleModule.class);

    ServerLifecycleModule(ServerContext ctx, String name, String className) {
        this.name = name;
        this.className = className;
        this.ctx = ctx;
        this.leContext = new LifecycleEventContextImpl(ctx);

        _logger = LogDomains.getLogger(ServerLifecycleModule.class, 
            LogDomains.CORE_LOGGER);
        _isTraceEnabled = _logger.isLoggable(Level.FINE);
    }
    
    void setClasspath(String classpath) {
        this.classpath = classpath;
    }
    
    void setProperty(String name, String value) {
        props.put(name, value);
    }
    
    Properties getProperties() {
        return this.props;
    }
    
    void setLoadOrder(int loadOrder) {
        this.loadOrder = loadOrder;
    }
    
    void setIsFatal(boolean isFatal) {
        this.isFatal = isFatal;
    }
        
    String getName() {
        return this.name;
    }
    
    String getClassName() {
        return this.className;
    }

    String getClasspath() {
        return this.classpath;
    }

    int getLoadOrder() {
        return this.loadOrder;
    }
    
    boolean isFatal() {
        return isFatal;
    }
    
    LifecycleListener loadServerLifecycle() throws ServerLifecycleException {
        ClassLoader classLoader = ctx.getLifecycleParentClassLoader();

        try {
            if (this.classpath != null) {
                URL[] urls = getURLs();

                if (urls != null) {
                    StringBuffer sb = new StringBuffer(128);
                    for(int i=0;i<urls.length;i++) {
                        sb.append(urls[i].toString());
                    }
                    if (_isTraceEnabled)
                        _logger.fine("Lifecycle module = " + getName() + 
                                        " has classpath URLs = " + sb.toString());
                }

                this.urlClassLoader = new URLClassLoader(urls, classLoader);
                classLoader = this.urlClassLoader;
            }

            Class cl = Class.forName(className, true, classLoader);
            slcl = (LifecycleListener) cl.newInstance();
        } catch (Exception ee) {
            _logger.log(Level.SEVERE, localStrings.getLocalString("lifecyclemodule.load_exception", "Exception loading lifecycle module", this.name, ee.toString()), ee) ;
            if (isFatal) {
                throw new ServerLifecycleException(localStrings.getLocalString("lifecyclemodule.loadExceptionIsFatal", "Treating failure loading the lifecycle module as fatal", this.name));
            }
        }

        return slcl;
    }
    
    private URL[] getURLs() {
        List<URL> urlList = ASClassLoaderUtil.getURLsFromClasspath(
            this.classpath, File.pathSeparator, "");
        return ASClassLoaderUtil.convertURLListToArray(urlList);
    }

    private void postEvent(int eventType, Object data)
                                    throws ServerLifecycleException {
        if (slcl == null) {
            if (isFatal) {
                throw new ServerLifecycleException(localStrings.getLocalString("lifecyclemodule.loadExceptionIsFatal", "Treating failure loading the lifecycle module as fatal", this.name));
            }

            return;
        }

        if (urlClassLoader != null)
            setClassLoader();

        LifecycleEvent slcEvent= new LifecycleEvent(this, eventType, data, this.leContext);
        try {
            slcl.handleEvent(slcEvent);
        } catch (ServerLifecycleException sle) {
            _logger.log(Level.WARNING, localStrings.getLocalString("lifecyclemodule.event_ServerLifecycleException", "Lifecycle module threw ServerLifecycleException", this.name), sle);

            if (isFatal)
                throw sle;
        } catch (Exception ee) {
            _logger.log(Level.WARNING, localStrings.getLocalString("lifecyclemodule.event_Exception", "Lifecycle module threw an Exception", this.name), ee);

            if (isFatal) {
                throw new ServerLifecycleException(localStrings.getLocalString("lifecyclemodule.event_exceptionIsFatal", "Treating the exception from lifecycle module event handler as fatal"), ee);
            }
        }
    }
    
    public void onInitialization() 
                                throws ServerLifecycleException {
        postEvent(LifecycleEvent.INIT_EVENT, props);
    }

    public void onStartup()
                                    throws ServerLifecycleException {
        postEvent(LifecycleEvent.STARTUP_EVENT, props);
    }
    
    public void onReady() throws ServerLifecycleException {
        postEvent(LifecycleEvent.READY_EVENT, props);
    }

    public void onShutdown() throws ServerLifecycleException {
        postEvent(LifecycleEvent.SHUTDOWN_EVENT, props);
    }
    
    public void onTermination() throws ServerLifecycleException {
        postEvent(LifecycleEvent.TERMINATION_EVENT, props);
    }
    
    private void setClassLoader() {
         // set the url class loader as the thread context class loader
        java.security.AccessController.doPrivileged(
            new java.security.PrivilegedAction() {
                public Object run() {
                    Thread.currentThread().setContextClassLoader(urlClassLoader);
                    return null;
                }
            }
        );
    }

    /**
     * return status of this lifecycle module as a string
     */
    public String getStatus() {
        return statusMsg;
    }

    public String toString() {
        return "Server LifecycleListener support";
    }
}