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lightweight message queue, service bus
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/**
 * The MIT License (MIT)
 * Copyright (c) 2009-2015 HONG LEIMING
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.zbus.kit.pool.impl;

import java.io.IOException;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.atomic.AtomicInteger;

import org.zbus.kit.log.Logger;
import org.zbus.kit.pool.ObjectFactory;
import org.zbus.kit.pool.Pool;
import org.zbus.kit.pool.PoolConfig;
import org.zbus.kit.pool.PoolFactory;

public class DefaultPoolFactory implements PoolFactory {
	private static final Logger log = Logger.getLogger(Pool.class);
	@Override
	public  Pool getPool(ObjectFactory factory, PoolConfig config) { 
		log.debug("Using Zbus DefaultPool");
		return new DefaultPool(factory, config);
	}
	
	static class DefaultPool extends Pool {
		private ObjectFactory factory;
		private PoolConfig config;
		
		private BlockingQueue queue = null;
		private final int maxTotal;
		private final AtomicInteger activeCount = new AtomicInteger(0);
		
		public DefaultPool(ObjectFactory factory, PoolConfig config) { 
			this.factory = factory;
			this.config = config;
			
			this.maxTotal = this.config.getMaxTotal();
			this.queue = new ArrayBlockingQueue(maxTotal);
		}
		
		@Override
		public void close() throws IOException { 
			T obj = null;
			while((obj = queue.poll()) != null){
				factory.destroyObject(obj);
			}
		}

		@Override
		public T borrowObject() throws Exception { 
			T  obj = null;
			if(activeCount.get() >= maxTotal){
				obj = queue.take();
				return obj;
			}
			obj = queue.poll();
			if(obj != null) return obj;
			
			obj = factory.createObject();
			activeCount.incrementAndGet(); 
			
			return obj; 
		}

		@Override
		public void returnObject(T obj) { 
			if(!factory.validateObject(obj)){
				activeCount.decrementAndGet();
				factory.destroyObject(obj); 
				return;
			}
			queue.offer(obj);
		}
	}
}