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Common and utility library for the Service Grid Server Software and java web services.

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/*
 * $Id: CachingProxySelector.java 888 2013-06-14 06:21:33Z t-nakaguchi $
 *
 * This is a program for Language Grid Core Node. This combines multiple language resources and provides composite language services.
 * Copyright (C) 2005-2008 NICT Language Grid Project.
 *
 * This program is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by 
 * the Free Software Foundation, either version 2.1 of the License, or (at 
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License 
 * along with this program. If not, see .
 */
package jp.go.nict.langrid.commons.net.proxy;

import java.io.IOException;
import java.net.Proxy;
import java.net.ProxySelector;
import java.net.SocketAddress;
import java.net.URI;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * 
 * 
 * @author $Author: t-nakaguchi $
 * @version $Revision: 888 $
 */
public class CachingProxySelector extends ProxySelector{
	/**
	 * 
	 * 
	 */
	public CachingProxySelector(ProxySelector parent){
		this.parent = parent;
	}

	@Override
	public void connectFailed(URI uri, SocketAddress sa, IOException ioe) {
		parent.connectFailed(uri, sa, ioe);
	}

	@Override
	public List select(URI uri) {
		List proxies = cache.get(uri);
		if(proxies != null){
			return proxies;
		}

		proxies =  parent.select(uri);
		if(cache.size() == 100){
			Iterator it = cache.keySet().iterator();
			it.next();
			it.remove();
		}
		cache.put(uri, proxies);
		return proxies;
	}

	private ProxySelector parent;
	private Map> cache = new HashMap>();
}