Thread-Specific Storage Pattern

手工關閉log

public class ClientThread extends Thread {    public ClientThread(String name) {        super(name);    }    public void run() {        System.out.println(getName() + " BEGIN");        for (int i = 0; i < 10; i++) {            Log.println("i = " + i);            try {                Thread.sleep(100);            } catch (InterruptedException e) {            }        }        Log.close();        System.out.println(getName() + " END");    }}

public class Log {    private static final ThreadLocal tsLogCollection = new ThreadLocal();    // 加入一個log    public static void println(String s) {        getTSLog().println(s);    }    // 關閉log    public static void close() {        getTSLog().close();    }    // 取得線程特有的log    private static TSLog getTSLog() {        TSLog tsLog = (TSLog)tsLogCollection.get();        //如果線程是第一次呼叫，就建立新擋案並登陸log        if (tsLog == null) {            tsLog = new TSLog(Thread.currentThread().getName() + "-log.txt");            tsLogCollection.set(tsLog);        }        return tsLog;    }

自動關閉，啟用新線程來負責關閉：

public class ClientThread extends Thread {    public ClientThread(String name) {        super(name);    }    public void run() {        System.out.println(getName() + " BEGIN");        for (int i = 0; i < 10; i++) {            Log.println("i = " + i);            try {                Thread.sleep(100);            } catch (InterruptedException e) {            }        }               System.out.println(getName() + " END");    }}

 

public class Log {    private static final ThreadLocal tsLogCollection = new ThreadLocal();    // 加入一個log    public static void println(String s) {        getTSLog().println(s);    }    // 關閉log    public static void close() {        getTSLog().close();    }    // 取得線程特有的log    private static TSLog getTSLog() {        TSLog tsLog = (TSLog)tsLogCollection.get();            if (tsLog == null) {            tsLog = new TSLog(Thread.currentThread().getName() + "-log.txt");            tsLogCollection.set(tsLog);            startWatcher(tsLog);        }        return tsLog;    }    private static void startWatcher(final TSLog tsLog) {                final Thread target = Thread.currentThread();               final Thread watcher = new Thread() {            public void run() {                System.out.println("startWatcher for " + target.getName() + " BEGIN");                try {                    target.join();                } catch (InterruptedException e) {                }                tsLog.close();                System.out.println("startWatcher for " + target.getName() + " END");            }        };        watcher.start();    }}