| /* |
| * Copyright 1999,2004 The Apache Software Foundation. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| 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; |
| } |
| } |