/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 * [See end of file]
 */

package lib;

import java.util.concurrent.BlockingDeque;
import java.util.concurrent.LinkedBlockingDeque;
import com.hp.hpl.jena.sparql.ARQException;

/** Finite capacity pool - capacity is fixed at create time */ 
public class PoolFiniteBlocking<T> implements Pool<T>
{
    BlockingDeque<T> pool  ;
    
    public PoolFiniteBlocking(int size) { pool = new LinkedBlockingDeque<T>(size) ; }
    
    @Override
    public final void put(T item)
    {
        pool.addLast(item) ;
    }
    
    @Override
    public T get()              
    { 
        try
        { 
            return pool.takeFirst() ;
        } catch (InterruptedException ex)
        {
            throw new ARQException("Failed to get an item from the pool (InterruptedException): "+ex.getMessage()) ;
        }
    }
    
    @Override
    public boolean isEmpty()    { return pool.isEmpty() ; } 
}

/*
 * (c) Copyright 2008, 2009 Hewlett-Packard Development Company, LP
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */