// SimplePool.java /** * Copyright (C) 2008 10gen Inc. * * 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.bson.util; import java.util.*; import java.util.concurrent.*; public abstract class SimplePool<T> { public SimplePool( int max ){ _max = max; } public SimplePool(){ _max = 1000; } protected abstract T createNew(); protected boolean ok( T t ){ return true; } public T get(){ T t = _stored.poll(); if ( t != null ) return t; return createNew(); } public void done( T t ){ if ( ! ok( t ) ) return; if ( _stored.size() > _max ) return; _stored.add( t ); } final int _max; private Queue<T> _stored = new ConcurrentLinkedQueue<T>(); }