Should we shut down ExecutorService?

An ExecutorService should be shut down once it is no longer needed to free up system resources and to allow graceful application shutdown. Because the threads in an ExecutorService may be nondaemon threads, they may prevent normal application termination.

What is the difference between shutdown and shutdownNow?

shutdown() will just tell the executor service that it can’t accept new tasks, but the already submitted tasks continue to run. shutdownNow() will do the same AND will try to cancel the already submitted tasks by interrupting the relevant threads.

What does ExecutorService shutdown do?

Shutting down the ExecutorService shutdown() – when shutdown() method is called on an executor service, it stops accepting new tasks, waits for previously submitted tasks to execute, and then terminates the executor. shutdownNow() – this method interrupts the running task and shuts down the executor immediately.

How do I shut down ExecutorService gracefully?

A typical orderly shutdown of an ExecutorService might look something like this: final ExecutorService executor; Runtime. getRuntime(). addShutdownHook(new Thread() { public void run() { executor.

How to use ExecutorService-shutdown, shutdownnow and awaittermination?

ExecutorService interface provides 3 methods shutdown (), shutdownNow () and awaitTermination​ () for controlling the termination of tasks submitted to executor. Learn to use these methods under different requirements. 1.

What to do when executor shuts down a thread?

After Executor’s Shutdown. When using an Executor, we can shut it down by calling the shutdown() or shutdownNow() methods. Although, it won’t wait until all threads stop executing. Waiting for existing threads to complete their execution can be achieved by using the awaitTermination() method.

What’s the difference between shutdown ( ) and awaittermination ( )?

In short, shutdown () means the executor service takes no more incoming tasks. Remember that awaitTermination () is invoked after a shutdown () request. 2. Using ExecutorService shutdown () and awaitTermination​ () together In general, the ExecutorService will not be automatically destroyed when there is not task to process.

How to shut down an ExecutorService in Java?

An ExecutorService can be shut down, which will cause it to reject new tasks. Two different methods are provided for shutting down an ExecutorService. The shutdown() method will allow previously submitted tasks to execute before terminating, while the shutdownNow() method prevents waiting tasks…

https://www.youtube.com/watch?v=ebhOShT3fYM