config.java

EasyDBO是一个超轻量级对象-关系映射（Object/Relation Mapping

package com.easyjf.cache;

import com.easyjf.cache.store.*;

import org.dom4j.*;
import org.dom4j.io.*;

//~--- JDK imports ------------------------------------------------------------

import java.util.*;

//~--- classes ----------------------------------------------------------------

/**
 * 
 * <p>
 * Title:通过XML文件读取Cache配置文件，配置文件信息主要用于创建ICache对象
 * </p>
 * 
 * <p>
 * Description: <easyjf-cache> <cache name="cache名称" storePolicy="存诸策略"
 * maxElements="最大元素" expiredInterval="最大超时" type="chche类" /> </easyjf-cache
 * </p>
 * 
 * <p>
 * Copyright: Copyright (c) 2006
 * </p>
 * 
 * <p>
 * Company: EasyJF开源团队-EasyDBO项目组
 * </p>
 * 
 * @author 大峡
 * @version 1.0
 */
public class Config {
	private static Config singleton;

	// ~--- fields -------------------------------------------------------------

	private Map caches = new HashMap();

	private ICache defaultCache;// 默认缓存

	private String fileName;// 配置文件名

	// ~--- constructors -------------------------------------------------------

	public Config(String fileName) {
		this.fileName = fileName;
	}

	// ~--- methods ------------------------------------------------------------
	/**
	 * 初始化
	 */
	private void init() {
		Document doc = null;
		if (fileName != null) {
			SAXReader reader = new SAXReader();
			try {
				doc = reader.read(Config.class.getResourceAsStream(fileName));
			} catch (Exception e) {
				System.out.println("配置文件错误:" + e);
				e.printStackTrace();
			}

			if (doc != null) {
				List list = doc.selectNodes("/easyjf-cache/cache");

				if (list != null) {
					for (int i = 0; i < list.size(); i++) {
						org.dom4j.Element el = (org.dom4j.Element) list.get(i);
						String name = el.attributeValue("name");
						int storePolicy = StorePolicy.get(el
								.attributeValue("storePolicy"));
						int maxElements = Integer.parseInt(el
								.attributeValue("maxElements"));
						long expiredInterval = Long.parseLong(el
								.attributeValue("expiredInterval"));
						ICache cache = new EasyCache(name, storePolicy,
								maxElements, expiredInterval);

						if (i == 0) {
							this.defaultCache = cache;
						}

						caches.put(name, cache);
					}
				}
			}
		}
	}
	/**
	 * 获取Cache
	 * 
	 * @param name
	 *            String 缓存名称
	 * @return ICache
	 */
	public ICache getCache(String name) {
		return (ICache) caches.get(name);
	}

	/**
	 * 
	 * @return Set
	 */
	public Set getCacheKeySet() {
		return caches.keySet();
	}

	/**
	 * 
	 * @return ICache
	 */
	public ICache getDefaultCache() {
		return defaultCache;
	}

	/**
	 * 
	 * @return Config
	 */
	public static Config getInstance() {
		if (singleton == null) {
			singleton = new Config("/easyjf-cache.xml");
			singleton.init();
		}

		return singleton;
	}

	/**
	 * 
	 * @param fileName
	 *            String
	 * @return Config
	 */
	public static Config getInstance(String fileName) {
		if (singleton == null) {
			singleton = new Config(fileName);
			singleton.init();
		}

		return singleton;
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Config.getInstance("/easyjf-cache.xml");
		System.out.println(Config.getInstance().defaultCache.getName());
	}

}