How to Synchronously Manage Thread Completion in Java's ExecutorService?

Synchronizing Thread Completion in ExecutorService

When executing tasks concurrently using ExecutorService, it becomes essential to monitor their progress and ensure they complete successfully. This article explores various methods to effectively handle thread synchronization in this context.

One crucial approach involves utilizing the shutdown() and awaitTermination() methods. By calling shutdown(), the ExecutorService process is signaled to commence orderly termination. Subsequently, awaitTermination() can be employed to patiently await the completion of all queued tasks within a specified time frame or indefinitely. This ensures that no tasks remain in progress before proceeding with subsequent operations.

ExecutorService taskExecutor = Executors.newFixedThreadPool(4);
while(...) {
  taskExecutor.execute(new MyTask());
}
taskExecutor.shutdown();
try {
  taskExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
} catch (InterruptedException e) {
  ...
}

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