two-phase termination模式-- 先收拾房間再睡覺

定義：

分兩段終止。她是一種先執行完終止處理再終止線程的模式。

引例：

類的一覽表

名字	說明
countupthread	表示技術的線程的類
main	測試行爲的類

public class CountupThread extends Thread {
    // 計數器的值
    private long counter = 0;

    // 已經送出終止請求則爲true
    private volatile boolean shutdownRequested = false;

    //  終止請求
    public void shutdownRequest() {
        shutdownRequested = true;
        interrupt();
    }

    // 判斷終求請求是否已經送出
    public boolean isShutdownRequested() {
        return shutdownRequested;
    }

    //動作
    public final void run() {
        try {
            while (!shutdownRequested) {
                doWork();
            }
        } catch (InterruptedException e) {
        } finally {
            doShutdown();
        }
    }

    //  作業
    private void doWork() throws InterruptedException {
        counter++;
        System.out.println("doWork: counter = " + counter);
        Thread.sleep(500);
    }

    // 終止處理
    private void doShutdown() {
        System.out.println("doShutdown: counter = " + counter);
    }
}

public class Main {
    public static void main(String[] args) {
        System.out.println("main: BEGIN");
        try {
           
            CountupThread t = new CountupThread();
            t.start();

            Thread.sleep(10000);

            System.out.println("main: shutdownRequest");
            t.shutdownRequest();

            System.out.println("main: join");


            t.join();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("main: END");
    }
}

 結果：main: BEGIN
doWork: counter = 1
doWork: counter = 2
doWork: counter = 3
doWork: counter = 4
doWork: counter = 5
doWork: counter = 6
doWork: counter = 7
doWork: counter = 8
doWork: counter = 9
doWork: counter = 10
doWork: counter = 11
doWork: counter = 12
doWork: counter = 13
doWork: counter = 14
doWork: counter = 15
doWork: counter = 16
doWork: counter = 17
doWork: counter = 18
doWork: counter = 19
doWork: counter = 20
main: shutdownRequest
main: join
doShutdown: counter = 20
main: END

 

two-phase termination模式中的角色：

terminationrequester（終止請求發出者）：向terminator發出終止請求。

terminator（終止者）：terminator角色負責接收終止請求，並執行。