70 lines
1.5 KiB
Java
70 lines
1.5 KiB
Java
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package cache;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Properties;
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public class ProblemsCachManager {
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private boolean update = false;
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private BaseCache cache;
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private static ProblemsCachManager instance;
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private static Object lock = new Object();
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private ProblemsCachManager() {
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// <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>;
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Properties prop = new Properties();
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InputStream in = ProblemsCachManager.class
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.getResourceAsStream("cache.properties");
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try {
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prop.load(in);
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String validTime = prop.getProperty("problemsValidTime").trim();
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cache = new BaseCache("Problems", Integer.parseInt(validTime));
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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public static ProblemsCachManager getInstance() {
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if (instance == null) {
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synchronized (lock) {
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if (instance == null) {
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instance = new ProblemsCachManager();
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}
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}
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}
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return instance;
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}
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public void putObject(String key, Object value) { // key<65><79>classId_examId
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cache.put(key, value);
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}
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public void removeObject(String key) {
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cache.remove(key);
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}
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public void removeAllObject() {
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cache.removeAll();
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}
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public Object getObject(String key) {
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try {
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// <20><>Cache<68>л<EFBFBD><D0BB><EFBFBD>
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return cache.get(key);
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} catch (Exception e) {
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// Cache<68><65>û<EFBFBD><C3BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DB<44><42><EFBFBD><EFBFBD>ȡ
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// <20><><EFBFBD>ݿ<EFBFBD><DDBF>ж<EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD>
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// <20>ѻ<EFBFBD>ȡ<EFBFBD>Ķ<EFBFBD><C4B6><EFBFBD><EFBFBD>ٴδ<D9B4><CEB4><EFBFBD>Cache<68><65>
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this.putObject(key, null);
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update = true;
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return null;
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} finally {
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if (!update) {
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// <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>
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cache.cancelUpdate(key); // ȡ<><C8A1><EFBFBD><EFBFBD>id<69>ĸ<EFBFBD><C4B8><EFBFBD>
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}
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}
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}
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}
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