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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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/*
 * ProcessorPool.java
 *
 * @author Mike Grogan
 * Created on March 23, 2006, 1:08 PM
 *
 */

package com.sun.xml.ws.rm.jaxws.runtime.client;
import com.sun.xml.ws.api.pipe.Pipe;
import com.sun.xml.ws.api.pipe.PipeCloner;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.Stack;
/**
 * Pool of Pipelines used by RMClientPipe to insure that
 * no two invocations of nextPipe.process() are done concurrently.
 */
@SuppressWarnings("unchecked")
public class ProcessorPool<T extends Pipe> extends Stack<T> {
    
    private T pipe;
    private int capacity;
    private int length = 0;
    
    public ProcessorPool(T pipe) {
        this(pipe, 5);
    }
    
    /** Creates a new instance of ProcessorPool */
    public ProcessorPool(T pipe, int capacity){
        this.capacity = capacity;
        this.pipe =pipe;
        
        
    }
    
    public synchronized T checkOut() {
        try {
            if (!empty()) {
                return pop();
            } else if (length < capacity) {
                length++;
                return (T)PipeCloner.clone(pipe);
            } else {
                while (empty()) {
                    wait();
                }
                return pop();
            }
        } catch (InterruptedException e) {
        }
        return null;
    } 
    
    public synchronized void checkIn(T in) {
        push(in);
        notifyAll();
    }
    
   
}