thread-specific stroage模式一个线程一个储物柜_多线程实现储存柜连接-优快云博客

本文详细介绍了thread-specific storage模式，对比了使用与不使用该模式的日志记录实例，阐述了其如何为每个线程分配独立存储空间，避免线程间的数据冲突，提升程序的并发性能。

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定义：

thread-specific stroage模式是一种即使只有一个入口，也会在内部为每个线程分配特定的空间的模式

引例：

不用thread-specific stroage模式的实例

public class Log {
    private static PrintWriter writer = null;

    // 初始化writer字段
    static {
        try {
            writer = new PrintWriter(new FileWriter("log.txt"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 加入一笔log
    public static void println(String s) {
        writer.println(s);
    }

    // 关闭log
    public static void close() {
        writer.println("==== End of log ====");
        writer.close();
    }
}

public class Main {
    public static void main(String[] args) {
        System.out.println("BEGIN");
        for (int i = 0; i < 10; i++) {
            Log.println("main: i = " + i);
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
            }
        }
        Log.close();
        System.out.println("END");
    }
}

用thread-specific stroage模式的实例

public class Log {
    private static final ThreadLocal tsLogCollection = new ThreadLocal();

    // 加入一个log
    public static void println(String s) {
        getTSLog().println(s);
    }

    // 关闭log
    public static void close() {
        getTSLog().close();
    }

    // 取得线程特有的log
    private static TSLog getTSLog() {
        TSLog tsLog = (TSLog)tsLogCollection.get();

        //如果线程是第一次呼叫，就建立新挡案并登陆log
        if (tsLog == null) {
            tsLog = new TSLog(Thread.currentThread().getName() + "-log.txt");
            tsLogCollection.set(tsLog);
        }

        return tsLog;
    }
}

public class TSLog {
    private PrintWriter writer = null;

    //  初始化writer字段
    public TSLog(String filename) {
        try {
            writer = new PrintWriter(new FileWriter(filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //  加入一笔log
    public void println(String s) {
        writer.println(s);
    }

    //  关闭log
    public void close() {
        writer.println("==== End of log ====");
        writer.close();
    }
}

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 Main {
    public static void main(String[] args) {
        new ClientThread("Alice").start();
        new ClientThread("Bobby").start();
        new ClientThread("Chris").start();
    }
}