Spring Cancel @Async Task
Actually, Spring @Async uses a background thread pool of it's own. And as long as cancel() method of Future or shutdownNow() of executor service is concerned, Calling executor.shutdownNow() or future.cancel(true) don’t stop the ongoing thread immediately. What these methods do is simply call .interrupt() on the respective thread(s). And interrupts has no guaranteed immediate effect. It issues a flag so whenever in sleeping or waiting state, the thread will be stopped.
To be noted, If your tasks ignore the interruption, executor.shutdownNow() and future.cancel(true) will behave exactly the same way as executor.shutdown() and future.cancel(false).
If you need a way to stop the slow or blocking operation. If you have a long/endless loop, you can just add a condition whether Thread.currentThread().isInterrupted() and don’t continue if it is true(end the operation).