How can I interrupt method execution by time?

Question

Suppose method A is calling method B . Can method A control execution time of method B and interrupt it in, suppose, 60 seconds (method B can hangs for example)?

Answer 1

You can run tasks asynchronously using an ExecutorService , obtaining a Future that enables you to get the result of the task when it is done. There's a get method on the Future that you can call to wait for the answer, with a timeout. If it times out, you try to cancel the task by calling cancel on the Future .

ExecutorService executorService = Executors.newSingleThreadExecutor();

// Callable that has a run() method that executes the task
Callable<String> callable = ...;

// Submit the task for execution
Future<String> future = executorService.submit(callable);

try {
    String result = future.get(30, TimeUnit.SECONDS);
    System.out.println("Result: " + result);
}
catch (TimeoutException e) {
    System.out.println("Timeout");
    future.cancel(true);
}

There's a lot more to the concurrency API, see the package java.util.concurrent .

Answer 2

Could you describe what exactly do you want? Just stopping of execution method you can use return, System.exit() , last stop VM. By time, just check time and return from method. Also, you can try some reflection hacks... By the way, these are just a imagination if you will describe in more words what do you need I will help you.

Answer 3

Try:

public static void wait(int n){
    long time0,time1;
     time0=System.currentTimeMillis();
    do{
        time1=System.currentTimeMillis();
    }
    while (time1-time0<n);

}

I think that works. If you invoke this method, pass it with the amount of time in milliseconds you want the program to wait as parameter.

Good luck!