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   * 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
  * 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.web.ara;
Customized Pipeline which wrap the original Task instance with an instance of IsolatedTask

Jeanfrancois Arcand
 public class IsolationPipeline extends LinkedListPipeline 
         implements TaskListener{
     private final static String ALGORITHM_CLASS = 
     private final static String RULE_EXECUTOR_CLASS = 
Cache instance of IsolatedTask
     private Queue<IsolatedTaskisolatedTasks;
     // ------------------------------------------------------ Constructor ---/
     public IsolationPipeline(){
Initialize this pipeline by first initializing its parent, and then by creating the caches and the rule executor engine.
     public void initPipeline(){
         // 1. first, init this pipeline.
         // 2. Create cache
          = new ConcurrentQueue<IsolatedTask>("IsolationPipeline.isolatedTasks");
         // 3. Cache IsolatedTask
         for (int i=0; i < i++){
Create new WorkerThreadImpl. This method must be invoked from a synchronized block.
    protected void increaseWorkerThread(int incrementboolean startThread){        
        WorkerThreadImpl workerThread;
        if ( >= return;
         =  - ;    
        for (int i=0; i < i++){
            workerThread = new WorkerThreadImpl(this
                     + "WorkerThread-"  +  + "-" + i);
            if (startThread)
            [i] = workerThread;
Execute the wrapped Task
    public void addTask(Task task) {    
        // SSL not yet supported.
        if (task.getType() == .){
        } else {

Wrap the current Task using an IsolatedTask
    private Task wrap(Task task){
        IsolatedTask isolatedTask = .poll();
        if ( isolatedTask == null){
            isolatedTask = newIsolatedTask();
        return isolatedTask;

Create a new IsolatedTask
    private IsolatedTask newIsolatedTask(){
        IsolatedTask task = new IsolatedTask();
        task.pipeline = this;
        return task;
Create a new StreamAlgorithm.
    private StreamAlgorithm newAlgorithm(){
Create the new RulesExecutor
    private RulesExecutor newRulesExecutor(){
    // ----------------------------------------------- Task Listener ---------//
    public void taskStarted(TaskEvent event) {
        ; // Do nothing.

Return the IsolatedTask to the pool.
    public void taskEvent(TaskEvent event) {
        if ( event.getStatus() == .)
    // ----------------------------------------------- Util ------------------//
Instanciate a class based on a property.
    private Object loadInstance(String property){        
        Class className = null;                                 
            className = Class.forName(property);
            return className.newInstance();
        } catch (ClassNotFoundException ex){
        } catch (InstantiationException ex){
        } catch (IllegalAccessException ex){
        // Default
        if ( property.equals()){
            return new ContextRootAlgorithm();
        } else if ( property.equals()){
            return new IsolationRulesExecutor();
        throw new IllegalStateException();
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