Glassfish example source code file (ConnectionExecutionContext.java)

This example Glassfish source code file (ConnectionExecutionContext.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

boolean, boolean, clientthreadid, clientthreadid, create, hashtable, hashtable, id, iiop_client_per_thread_flag, long, object, privilegedaction, security, threadlocal, threadlocal, util

The Glassfish ConnectionExecutionContext.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.iiop.security;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Hashtable;

/**
 * This class that implements ConnectionExecutionContext that gets 
 * stored in Thread Local Storage. If the current thread creates
 * child threads, the context info that is  stored in the current 
 * thread is automatically propogated to the child threads.
 * 
 * Two class methods serve as a convinient way to set/get the 
 * Context information within the current thread.   
 *
 * Thread Local Storage is a concept introduced in JDK1.2. So, it
 * will not work on earlier releases of JDK.
 *
 * @see java.lang.ThreadLocal
 * @see java.lang.InheritableThreadLocal
 * 
 */
public class ConnectionExecutionContext {
    
    public static final String IIOP_CLIENT_PER_THREAD_FLAG =
        "com.sun.appserv.iiopclient.perthreadauth";
    private static final boolean isPerThreadAuth;

    static {
       Boolean b  = (Boolean) AccessController.doPrivileged( new PrivilegedAction(){
            @Override
            public Object run() {
                 return new Boolean(Boolean.getBoolean(IIOP_CLIENT_PER_THREAD_FLAG));
            }

       });
       isPerThreadAuth = b.booleanValue();
    }

     //private static final InheritableThreadLocal connCurrent= new InheritableThreadLocal();
    private static final ThreadLocal connCurrent= (isPerThreadAuth) ? new ThreadLocal() : new InheritableThreadLocal();

    // XXX: Workaround for non-null connection object ri for local invocation.
    private static final ThreadLocal<Long> ClientThreadID = new ThreadLocal();

    public static Long readClientThreadID() {
        Long ID = ClientThreadID.get();
        //ClientThreadID.remove();
        return ID;
    }

    public static void setClientThreadID(Long ClientThreadID) {
        ConnectionExecutionContext.ClientThreadID.set(ClientThreadID);
    }

    public static void removeClientThreadID() {
        ClientThreadID.remove();
    }

    /** 
     * This method can be used to add a new hashtable for storing the 
     * Thread specific context information. This method is useful to add a 
     * deserialized Context information that arrived over the wire.
     * @param A hashtable that stores the current thread's context
     * information.
     */
    public static void setContext(Hashtable ctxTable) {
        if (ctxTable != null) {
            connCurrent.set(ctxTable);
        } else {
            connCurrent.set(new Hashtable());
        }
    }

    /**
     * This method returns the hashtable that stores the thread specific
     * Context information.
     * @return The Context object stored in the current TLS. It always 
     * returns a non null value;
     */
    public static Hashtable getContext() {
         if (connCurrent.get() == null) {
             setContext(null); // Create a new one...
         } 
         return (Hashtable) connCurrent.get();
    }
}