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  /*
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
   * 
   * Copyright 1997-2007 Sun Microsystems, Inc. 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.html
  * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
  * Sun designates this particular file as subject to the "Classpath" exception
  * as provided by Sun in the GPL Version 2 section of the License file that
  * accompanied this code.  If applicable, add the following below the License
  * Header, with the fields enclosed by brackets [] replaced by your own
  * identifying information: "Portions Copyrighted [year]
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  * 
  * Contributor(s):
  * 
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  * elects to include this software in this distribution under the [CDDL or GPL
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  * recipient has the option to distribute your version of this file under
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  * 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

Author(s):
Jeanfrancois Arcand
 
 public class IsolationPipeline extends LinkedListPipeline 
         implements TaskListener{
     
     private final static String ALGORITHM_CLASS = 
          "com.sun.enterprise.web.ara.algorithm";
     private final static String RULE_EXECUTOR_CLASS = 
          "com.sun.enterprise.web.ara.ruleExecutor";
            
            
    
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.
 
     @Override
     public void initPipeline(){
         // 1. first, init this pipeline.
         super.initPipeline();
         
         // 2. Create cache
          = new ConcurrentQueue<IsolatedTask>("IsolationPipeline.isolatedTasks");
         
         // 3. Cache IsolatedTask
         for (int i=0; i < i++){
             .offer(newIsolatedTask());
         }  
     }
    
    
    
Create new WorkerThreadImpl. This method must be invoked from a synchronized block.
    @Override
    protected void increaseWorkerThread(int incrementboolean startThread){        
        WorkerThreadImpl workerThread;
        
        if ( >= return;
        
         =  - ;    
        
        for (int i=0; i < i++){
            workerThread = new WorkerThreadImpl(this
                     + "WorkerThread-"  +  + "-" + i);
            workerThread.setPriority();
            
            if (startThread)
                workerThread.start();
            
            [i] = workerThread;
            ++; 
        }
    }
    
    
    
Execute the wrapped Task
    @Override
    public void addTask(Task task) {    
        // SSL not yet supported.
        if (task.getType() == .){
            super.addTask(wrap(task));
        } else {
            super.addTask(task);
        }
    }
    

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

    
    
Create a new IsolatedTask
    private IsolatedTask newIsolatedTask(){
        IsolatedTask task = new IsolatedTask();
        
        task.setAlgorithm(newAlgorithm());
        task.setRulesExecutor(newRulesExecutor());
        task.addTaskListener(this);
        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() == .)
            .offer((IsolatedTask)event.attachement());
    }
    
    // ----------------------------------------------- Util ------------------//
    
    
Instanciate a class based on a property.
    private Object loadInstance(String property){        
        Class className = null;                                 
        try{                              
            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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