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JSP2.1 Jasper implementation from Glassfish
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* Copyright 2004 The Apache Software Foundation
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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package org.apache.jasper.util;
/**
* Simple object pool. Based on ThreadPool and few other classes
*
* The pool will ignore overflow and return null if empty.
*
* @author Gal Shachor
* @author Costin
*/
public final class SimplePool {
private static final int DEFAULT_SIZE=16;
/*
* Where the threads are held.
*/
private Object pool[];
private int max;
private int current=-1;
private Object lock;
public SimplePool() {
this.max=DEFAULT_SIZE;
this.pool=new Object[max];
this.lock=new Object();
}
public SimplePool(int max) {
this.max=max;
this.pool=new Object[max];
this.lock=new Object();
}
/**
* Adds the given object to the pool, and does nothing if the pool is full
*/
public void put(Object o) {
synchronized( lock ) {
if( current < (max-1) ) {
current += 1;
pool[current] = o;
}
}
}
/**
* Get an object from the pool, null if the pool is empty.
*/
public Object get() {
Object item = null;
synchronized( lock ) {
if( current >= 0 ) {
item = pool[current];
current -= 1;
}
}
return item;
}
/**
* Return the size of the pool
*/
public int getMax() {
return max;
}
}