servermetadataloaderfactory.java

《j2ee开发全程实录》随书源码

package com.cownew.PIS.framework.server.helper;

import com.cownew.PIS.framework.common.metaDataMgr.IMetaDataLoader;
import com.cownew.PIS.framework.common.metaDataMgr.MetaDataLoader;

/**
 * 服务器端元数据加载器
 * @author 杨中科
 *
 */
public class ServerMetaDataLoaderFactory
{
	private static MetaDataLoader loader;

	public static IMetaDataLoader getLoader()
	{
		if (loader != null)
		{
			return loader;
		}

		ServerConfig config = ServerConfig.getInstance();
		String entityCacheFile = config.getEntityCacheFile();
		String metaDataPath = config.getMetaDataPath();
		loader = new MetaDataLoader(metaDataPath, entityCacheFile);
		loader.setCacheEnable(ServerConfig.getInstance().isMetaCacheEnabled());
		return loader;
	}

	static
	{
		Runtime.getRuntime().addShutdownHook(new Thread() {
			public void run()
			{
				super.run();
				ServerMetaDataLoaderFactory.getLoader().saveCache();
			}
		});
	}

}