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Glassfish example source code file (ConnectorClassLoaderServiceImpl.java)

This example Glassfish source code file (ConnectorClassLoaderServiceImpl.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

appspecificconnectorclassloaderutil, classloader, classloader, connectorclassloaderservice, connectorclassloaderservice, connectorclassloaderserviceimpl, delegatingclassloader, delegatingclassloader, habitat, inject, inject, log, logger, logging, service, string, util

The Glassfish ConnectorClassLoaderServiceImpl.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2007-2010 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]"
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 * 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
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 */

package com.sun.appserv.connectors.internal.api;

import org.glassfish.internal.api.*;
import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.component.Habitat;

import java.util.*;
import java.util.logging.Logger;
import java.util.logging.Level;

import com.sun.logging.LogDomains;

/**
 * We support two policies:
 * 1. All standalone RARs are available to all other applications. This is the
 * Java EE 5 specific behavior.
 * 2. An application has visbility to only those standalone RARs that it
 * depends on. This is the new behavior defined in Java EE 6 as well as
 * JCA 1.6 spec. 
 *
 * @author Sanjeeb.Sahoo@Sun.COM
 */
@Service
public class ConnectorClassLoaderServiceImpl implements ConnectorClassLoaderService {

    /**
     * This class loader is used when we have just a single connector
     * class loader for all applications. In other words, we make every
     * standalone RARs available to all applications.
     */
    private DelegatingClassLoader globalConnectorCL;

    @Inject
    private AppSpecificConnectorClassLoaderUtil appsSpecificCCLUtil;

    @Inject
    Habitat habitat;

    private Logger logger = LogDomains.getLogger(ConnectorClassLoaderServiceImpl.class, LogDomains.RSR_LOGGER);


    /**
     * provides connector-class-loader for the specified application
     * If application is null, global connector class loader will be provided
     * @param appName application-name
     * @return class-loader
     */
    public DelegatingClassLoader getConnectorClassLoader(String appName) {
        DelegatingClassLoader loader = null;

       // We do not have dependency on common-class-loader explicitly
       // and also cannot initialize globalConnectorCL during postConstruct via ClassLoaderHierarchy
       // which will result in circular dependency injection between kernel and connector module
       // Hence initializing globalConnectorCL lazily
       if(globalConnectorCL == null){
           synchronized (ConnectorClassLoaderServiceImpl.class){
               if(globalConnectorCL == null){
                   ClassLoader parent = getCommonClassLoader();
                    globalConnectorCL =  new DelegatingClassLoader(parent);
                    for(DelegatingClassLoader.ClassFinder cf : appsSpecificCCLUtil.getSystemRARClassLoaders()){
                        globalConnectorCL.addDelegate(cf);
                    }
               }
           }
        }
        if (hasGlobalAccessForRARs(appName)) {
            assert (globalConnectorCL != null);
            loader = globalConnectorCL;
        } else {
            appsSpecificCCLUtil.detectReferredRARs(appName);
            loader = createConnectorClassLoaderForApplication(appName);
        }
        return loader;
    }

    private boolean hasGlobalAccessForRARs(String appName) {
        return appName == null || appsSpecificCCLUtil.useGlobalConnectorClassLoader() ||
                appsSpecificCCLUtil.getRequiredResourceAdapters(appName).contains
                        (ConnectorConstants.RAR_VISIBILITY_GLOBAL_ACCESS);
    }

    private ClassLoader getCommonClassLoader(){
        return habitat.getComponent(ClassLoaderHierarchy.class).getCommonClassLoader();
    }

    private DelegatingClassLoader createConnectorClassLoaderForApplication(String appName){

        DelegatingClassLoader appSpecificConnectorClassLoader =
                new DelegatingClassLoader(getCommonClassLoader());

        //add system ra classloaders
        for(DelegatingClassLoader.ClassFinder cf : appsSpecificCCLUtil.getSystemRARClassLoaders()){
            appSpecificConnectorClassLoader.addDelegate(cf);
        }
        
        for(String raName : appsSpecificCCLUtil.getRARsReferredByApplication(appName)){
            addRarClassLoader(appName, appSpecificConnectorClassLoader, raName);
        }

        for(String raName : appsSpecificCCLUtil.getRequiredResourceAdapters(appName)){
            addRarClassLoader(appName, appSpecificConnectorClassLoader, raName);
        }
        return appSpecificConnectorClassLoader;
    }

    private void addRarClassLoader(String appName, DelegatingClassLoader appSpecificConnectorClassLoader, 
                                   String raName) {
        if(logger.isLoggable(Level.FINEST)){
                logger.finest("raName for app [ "+appName+" ] : " + raName);
        }
        DelegatingClassLoader.ClassFinder cf = getClassFinder(raName);

        if(cf != null){
            appSpecificConnectorClassLoader.addDelegate(cf);
        }else{
            //not possible
/*          TODO V3
            if(!ConnectorsUtil.isEmbedded(appName, raName)){
                throw new IllegalStateException("RAR Classloader of RAR [ "+raName+" ] not found for " +
                    "application [ "+appName+" ]");
            }
*/
        }
    }

    private DelegatingClassLoader.ClassFinder getClassFinder(String raName) {
        List<DelegatingClassLoader.ClassFinder> delegates = globalConnectorCL.getDelegates();
        DelegatingClassLoader.ClassFinder classFinder = null;
        for(DelegatingClassLoader.ClassFinder cf : delegates){
            if(raName.equals(((ConnectorClassFinder)cf).getResourceAdapterName())){
                classFinder = cf;
                break;
            }
        }
        return classFinder;
    }

}

Other Glassfish examples (source code examples)

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