Examples of java.util.concurrent.Future.cancel()

java.util.concurrent.Future.cancel()
Attempts to cancel execution of this task. This attempt will fail if the task has already completed, has already been cancelled, or could not be cancelled for some other reason. If successful, and this task has not started when {@code cancel} is called,this task should never run. If the task has already started, then the {@code mayInterruptIfRunning} parameter determineswhether the thread executing this task should be interrupted in an attempt to stop the task.
After this method returns, subsequent calls to {@link #isDone} willalways return {@code true}. Subsequent calls to {@link #isCancelled}will always return {@code true} if this method returned {@code true}. @param mayInterruptIfRunning {@code true} if the thread executing thistask should be interrupted; otherwise, in-progress tasks are allowed to complete @return {@code false} if the task could not be cancelled,typically because it has already completed normally; {@code true} otherwise

        executor.submit(task1);


        Callable task2 = new BasicTestTask();
        Future future = executor.submit(task2);
        assertFalse(future.isDone());
        assertTrue(future.cancel(true));
        assertTrue(future.isCancelled());
        assertTrue(future.isDone());


        try {
            future.get();

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        try {
            future.get(1, TimeUnit.SECONDS);
        } catch (TimeoutException ignored) {
        }


        assertTrue(future.cancel(true));
        assertTrue(future.isCancelled());
        assertTrue(future.isDone());
    }


    @Test(expected = CancellationException.class)

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        Future future = service.submit(task);
        try {
            future.get(1, TimeUnit.SECONDS);
        } catch (TimeoutException ignored) {
        }
        future.cancel(true);


        future.get();
    }


    @Test(expected = ExecutionException.class)

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        if (!threads.containsKey(pipelineId)) {
            throw new IllegalArgumentException("pipeline is not exist!");
        }


        Future future = threads.get(pipelineId);
        future.cancel(true);
    }


    private class SelectWorker implements Runnable {


        private ExecutorService executor = Executors.newFixedThreadPool(10, new NamedThreadFactory("SelectWorker"));

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        if (!threads.containsKey(pipelineId)) {
            throw new IllegalArgumentException("pipeline is not exist!");
        }


        Future future = threads.get(pipelineId);
        future.cancel(true);
    }


    private class ViewWorker implements Runnable {


        private Long pipelineId;

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        if (!threads.containsKey(pipelineId)) {
            throw new IllegalArgumentException("pipeline is not exist!");
        }


        Future future = threads.get(pipelineId);
        future.cancel(true);
    }


    private class transformWorker implements Runnable {


        private ExecutorService executor = Executors.newFixedThreadPool(10, new NamedThreadFactory("transformWorker"));

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        if (!threads.containsKey(pipelineId)) {
            throw new IllegalArgumentException("pipeline is not exist!");
        }


        Future future = threads.get(pipelineId);
        future.cancel(true);
    }


    private class ExtractWorker implements Runnable {


        private ExecutorService executor = Executors.newFixedThreadPool(10, new NamedThreadFactory("ExtractWorker"));

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        if (!threads.containsKey(pipelineId)) {
            throw new IllegalArgumentException("pipeline is not exist!");
        }


        Future future = threads.get(pipelineId);
        future.cancel(true);
    }


    private class TermintWorker implements Runnable {


        private Long pipelineId;

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        if (!threads.containsKey(pipelineId)) {
            throw new IllegalArgumentException("pipeline is not exist!");
        }


        Future future = threads.get(pipelineId);
        future.cancel(true);
    }


    private class MainStemWorker implements Runnable {


        private Long pipelineId;

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        if (!threads.containsKey(pipelineId)) {
            throw new IllegalArgumentException("pipeline is not exist!");
        }


        Future future = threads.get(pipelineId);
        future.cancel(true);
    }


    private class LoadWorker implements Runnable {


        private ExecutorService executor = Executors.newFixedThreadPool(10, new NamedThreadFactory("LoadWorker"));

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