Waiting for all the threads to finish before shutting down the Executors

Question

Here is my code snippet.

ExecutorService executor = Executors.newFixedThreadPool(ThreadPoolSize);
while(conditionTrue)
{
ClassImplementingRunnable c = new Cl         


        

Answer 1

You generally use the following idiom:

executor.shutdown();
executor.awaitTermination(Integer.MAX_VALUE, TimeUnit.SECONDS);

• shutdown just says that the executor won't accept new jobs.
• awaitTermination waits until all the tasks that have already been submitted finish what they are doing (or until the timeout is reached - which won't happen with Integer.MAX_VALUE - you might want to use a lower value).