JUDGER_AND_CLIENT/JuderUI/src/cache/ProblemsCachManager.java

package cache;

import common.LogLevel;
import common.Logger;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class ProblemsCachManager {
	private boolean update = false;
	private BaseCache cache;
	private static ProblemsCachManager instance;
	private static Object lock = new Object();
        private static Logger logger=Logger.getInstance();
	private ProblemsCachManager() {
		// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼBaseCache<68><65><EFBFBD><EFBFBD>;
		Properties prop = new Properties();
		InputStream in = ProblemsCachManager.class
				.getResourceAsStream("cache.properties");
		try {
			prop.load(in);
			String validTime = prop.getProperty("problemsValidTime").trim();
			cache = new BaseCache("Problems", Integer.parseInt(validTime));
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static ProblemsCachManager getInstance() {
		if (instance == null) {
			synchronized (lock) {
				if (instance == null) {
					instance = new ProblemsCachManager();
				}
			}
		}
		return instance;
	}

	public void putObject(String key, Object value) { // key<65><79>classId_examId
             logger.log("<EFBFBD>ѷ<EFBFBD><EFBFBD>뻺<EFBFBD><EFBFBD>"+key, LogLevel.INFO);
		cache.put(key, value);
	}

	public void removeObject(String key) {
            logger.log("<EFBFBD><EFBFBD><EFBFBD>Ƴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>"+key, LogLevel.INFO);
		cache.remove(key);
	}

	public void removeAllObject() {
		cache.removeAll();
	}

	public Object getObject(String key) {
		try {
			// <20><>Cache<68>л<EFBFBD><D0BB><EFBFBD>
			return cache.get(key);
		} catch (Exception e) {
                        logger.log("<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:"+key+"e:"+e.getMessage(), LogLevel.ERROR);
			// Cache<68><65>û<EFBFBD><C3BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DB<44><42><EFBFBD><EFBFBD>ȡ
			// <20><><EFBFBD>ݿ<EFBFBD><DDBF>ж<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>
			// <20>ѻ<EFBFBD>ȡ<EFBFBD>Ķ<EFBFBD><C4B6><EFBFBD><EFBFBD>ٴδ<D9B4><CEB4><EFBFBD>Cache<68><65>
			this.putObject(key, null);
			update = true;
			return null;
		} finally {
			if (!update) {
				// <20><><EFBFBD><EFBFBD>Cache<68>е<EFBFBD><D0B5><EFBFBD><EFBFBD>ݸ<EFBFBD><DDB8>³<EFBFBD><C2B3><EFBFBD><EFBFBD>쳣<EFBFBD><ECB3A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֹ<EFBFBD>÷<EFBFBD><C3B7><EFBFBD>
				cache.cancelUpdate(key); // ȡ<><C8A1><EFBFBD><EFBFBD>id<69>ĸ<EFBFBD><C4B8><EFBFBD>
			}
		}
	}

}