将UncaughtExceptionHandler附加到TimerTask

Question

是否可以将UncaughtExceptionHandler连接到TimerTask

(不是通过调用Thread.setDefaultUncaughtExceptionHandler())

Answer 1

您可以编写一个从run捕获Throwable的TimerTask代理。

public final class TimerTaskCatcher extends TimerTask {
    private final TimerTask orig;
    private final Thread.UncaughtExceptionHandler handler;
    public TimerTaskCatcher(
        TimerTask orig, 
        Thread.UncaughtExceptionHandler handler
    ) {
        if (orig == null || handler == null) {
            throw new NullPointerException();
        }
        this.orig = orig;
        this.handler = handler;
    }
    @Override public boolean cancel() {
        // **Edit:** Correction report due to @Discape.
        // In fact, this entire method could be elided.
        boolean weirdResult;
        try {
            orig.cancel();
        } finally {
            weirdResult = super.cancel();
        }
        return weirdResult;
    }
    @Override public void run() {
        try {
            orig.run();
        } catch (Throwable exc) {
            handler.uncaughtException(Thread.currentThread(), exc);
        }
    }
    @Override public long scheduledExecutionTime() {
        return orig.scheduledExecutionTime();
    }
}

顺便说一句:您可能想要考虑使用java.util.concurrent而不是Timer。

Answer 2

我想可以。有一个实例方法( Thread class中的setUncaughtExceptionHandler)设置了线程的UncaughtExceptionHandler。

在TimerTask的run方法中，您可以执行以下操作：

public void run() {
    Thread.currentThread().setUncaughtExceptionHandler(eh);
}