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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   *
   * Copyright (c) 1997-2012 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.
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  * exception as provided by Oracle in the GPL Version 2 section of the License
  * file that accompanied this code.
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  * Modifications:
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  * and therefore, elected the GPL Version 2 license, then the option applies
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 package com.sun.enterprise.connectors.util;
 
 
 import java.io.File;
 import java.util.*;
This class loader is responsible for loading standalone RAR files. This class loader is the parent of JarClassLoader (the application class loader)

Author(s):
Tony Ng, Sivakumar Thyagarajan
 
 public class ConnectorClassLoader extends ASURLClassLoader
 {
 
     private static final Logger _logger = LogDomains.getLogger(ConnectorClassLoader.class.);
 
     private volatile static ConnectorClassLoader classLoader = null;

    
A linked list of URL classloaders representing each deployed connector module
 
     private final List classLoaderChain = new LinkedList();

    
The parent class loader for the connector Class Loader [ie the common Classloader]
 
     private ClassLoader parent = null;

    
Maintains a mapping between rar name and a classloader that has services that RAR module.
 
     private final Map rarModuleClassLoaders = new HashMap();
 
     public static synchronized ConnectorClassLoader getInstance() {
         if ( == null) {
              =
                     AccessController.doPrivileged(new PrivilegedAction<ConnectorClassLoader>() {
                         public ConnectorClassLoader run() {
                             return new ConnectorClassLoader();
                         }
                     });
         }
         return ;
     }
 
    private ConnectorClassLoader() {
        super();
    }
    private ConnectorClassLoader(ClassLoader parent) {
        super(parent);
        this. = parent;
    }

    
Initializes this singleton with the given parent class loader if not already created.

Parameters:
parent parent class loader
Returns:
the instance
    public static ConnectorClassLoader getInstance(final ClassLoader parent) {
        if ( == null) {
            synchronized (ConnectorClassLoader.class) {
                if ( == null) {
                     = AccessController.doPrivileged(new PrivilegedAction<ConnectorClassLoader>() {
                        public ConnectorClassLoader run() {
                            return new ConnectorClassLoader(parent);
                        }
                    });
                }
            }
        }
        return ;
    }

    
Adds the requested resource adapter to the ConnectorClassLoader. A ConnectorClassLoader is created with the moduleDir as its search path and this classloader is added to the classloader chain.

Parameters:
rarName the resourceAdapter module name to add
moduleDir the directory location where the RAR contents are exploded
    public void addResourceAdapter(String rarNameString moduleDir) {
        try {
            File file = new File(moduleDir);
            ASURLClassLoader cl = AccessController.doPrivileged(new PrivilegedAction<ASURLClassLoader>() {
                        public ASURLClassLoader run() {
                            return new ASURLClassLoader();
                        }
                    });
            cl.appendURL(file.toURI().toURL());
            appendJars(filecl);
            .add(cl);
            .put(rarNamecl);
        } catch (MalformedURLException ex) {
            .log(."enterprise_util.connector_malformed_url"ex);
        }
    }
    //TODO V3 handling "unexploded jars" for now, V2 deployment module used to explode the jars also
    private void appendJars(File moduleDirASURLClassLoader clthrows MalformedURLException {
        if (moduleDir.isDirectory()) {
            for (File file : moduleDir.listFiles()) {
                if (file.getName().toUpperCase(Locale.getDefault()).endsWith(".JAR")) {
                    cl.appendURL(file.toURI().toURL());
                } else if (file.isDirectory()) {
                    appendJars(filecl); //recursive add
                }
            }
        }
    }

    
Removes the resource adapter's class loader from the classloader linked list

Parameters:
moduleName the connector module that needs to be removed.
    public void removeResourceAdapter(String moduleName) {
        ASURLClassLoader classLoaderToRemove =
                (ASURLClassLoader.get(moduleName);
        if (classLoaderToRemove != null) {
            .remove(classLoaderToRemove);
            .remove(moduleName);
            .log(
                    .,
                    "enterprise_util.remove_connector"
                    moduleName);
        }
    }
    /*
      * Loads the class with the specified name and resolves it if specified.
      *
      * @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
      */
    public synchronized Class loadClass(String nameboolean resolve)
            throws ClassNotFoundException {
        Class clz = null;
        //Use the delegation model to service class requests that could be
        //satisfied by parent [common class loader].
        if ( != null) {
            try {
                clz = .loadClass(name);
                if (clz != null) {
                    if (resolve) {
                        resolveClass(clz);
                    }
                    return clz;
                }
            } catch (ClassNotFoundException e) {
                //ignore and try the connector modules classloader
                //chain.
            }
        } else {
            return super.loadClass(nameresolve);
        }
        //Going through the connector module classloader chain to find
        // class and return the first match.
        for (Iterator iter = .iterator(); iter.hasNext();) {
            ASURLClassLoader ccl = (ASURLClassLoaderiter.next();
            try {
                clz = ccl.loadClass(name);
                if (clz != null) {
                    if (resolve) {
                        resolveClass(clz);
                    }
                    return clz;
                }
            } catch (ClassNotFoundException cnfe) {
                //ignore this exception and continue with next classloader in
                // chain
                continue;
            }
        }
        //Can't find requested class in parent and in our classloader chain
        throw new ClassNotFoundException(name);
    }

    
Returns all the resources of the connector classloaders in the chain, concatenated to a classpath string.

Notice that this method is called by the setClassPath() method of org.apache.catalina.loader.WebappLoader, since the ConnectorClassLoader does not extend off of URLClassLoader.

Returns:
Classpath string containing all the resources of the connectors in the chain. An empty string if there exists no connectors in the chain.
    public String getClasspath() {
        StringBuffer strBuf = new StringBuffer();
        for (int i = 0; i < .size(); i++) {
            ASURLClassLoader ecl = (ASURLClassLoader.get(i);
            String eclClasspath = ecl.getClasspath();
            if (eclClasspath != null) {
                if (i > 0) strBuf.append(.);
                strBuf.append(eclClasspath);
            }
        }
        return strBuf.toString();
    }
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