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/*
 * $RCSfile: TaskQueue.java,v $    
 *
 * Copyright 2000-2001 by iPlanet/Sun Microsystems, Inc.,
 * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
 * All rights reserved.
 * 
 * This software is the confidential and proprietary information
 * of iPlanet/Sun Microsystems, Inc. ("Confidential Information").
 * You shall not disclose such Confidential Information and shall
 * use it only in accordance with the terms of the license 
 * agreement you entered into with iPlanet/Sun Microsystems.
 */

/** 
 * <BR> <I>$Source: /cvs/glassfish/appserv-commons/src/java/com/sun/enterprise/util/threadpool/TaskQueue.java,v $</I> 
 * @author     $Author: tcfujii $ 
 * @version    $Revision: 1.4 $ $Date: 2007/05/05 05:32:20 $ 
 */
 
package com.sun.enterprise.util.threadpool;

import com.sun.enterprise.util.collection.BlockingQueue;
import com.sun.enterprise.util.collection.TooManyTasksException;
import com.sun.enterprise.util.collection.QueueClosedException;
import java.util.ArrayList;

/**
 * TaskQueue provides the user the ability to queue his objects without
 * worring about the usage of the TaskQueue by the ThreadPool. The 
 * responsibility of the Task creation is now delegated to the TaskFactory.
 * TaskFactory will create or pool the task objects that wrap the users
 * object. The tasks need to implement the Serviceable interface
 */
public class TaskQueue extends BlockingQueue
{
	
	private TaskFactory taskFactory;
	
	/**
	 * Create a TaskQueue that has an infinite queuelength with the
	 *	specified timeout.
	 * @param The maximum time remove() will block.
	 * @see remove()
	 */
	public TaskQueue(TaskFactory factory) {
		super();
		taskFactory = factory;
	}
	
	/**
	 * Create a TaskQueue that has the specified queue limit with the
	 *	specified timeout.
	 * @param The maximum time remove() will block.
	 * @param The queue length after which TooManyTasksException is thrown.
	 * @see remove()
	 */
	public TaskQueue(int queueLimit, TaskFactory factory) {
		super(queueLimit);
		taskFactory = factory;
	}
	
	/** 
	 * Add to the head of the queue. Probably a high priority job?
	 */
	public void addFirst(Object o)
		throws TooManyTasksException, QueueClosedException
	{
		super.addFirst(taskFactory.createTask(o));
	}

	/** 
	 * Add to the head of the queue. Probably a high priority job?
	 */
	public void addFirst(Servicable ser)
		throws TooManyTasksException, QueueClosedException
	{
		super.addFirst(ser);
	}
	
	/** 
	 * Add to the tail of the queue. 
	 */
	public void addLast(Object o)
		throws TooManyTasksException, QueueClosedException
	{
		super.addLast(taskFactory.createTask(o));
	}
	
	/** 
	 * Add to the tail of the queue. 
	 */
	public void addLast(Servicable ser)
		throws TooManyTasksException, QueueClosedException
	{
		super.addLast(ser);
	}
	
	/** 
	 * Add the job at the specified position. Probably based on priority?
	 */
	public void add(int index, Object object)
		throws TooManyTasksException, QueueClosedException
	{
		super.add(index, taskFactory.createTask(object));
	}
	
	public void addAll(ArrayList arrayList)
		throws TooManyTasksException, QueueClosedException
	{
		for (int i=0; i < arrayList.size(); i++) {
			Object o = taskFactory.createTask(arrayList.get(i));
			arrayList.set(i, o);
		}
		super.addAll(arrayList);
	}
	
    /**
     * Hook to enable factory to deleteTask. The deleteTask
     * can potentially return the object to some pool
     */
	public void destroyTask(Object o)
	{
		taskFactory.deleteTask(o);
	}
}