ExecutorService.invokeAll does NOT support collection of runnable task

java executorservice java.util.concurrent
rai.skumar picture rai.skumar · Jun 6, 2014 · Viewed 9.8k times · Source

Wanted to run collection of Runnable task through invokeAll(..) method of ExecutorService. But that's not supported as of now (supports collection of Callable task only)

Any specific reason for this? What's the alternative to do something similar.

Answer

rai.skumar picture rai.skumar · Jun 18, 2014 
Runnable task = new Runnable() { 
     public void run() {

     }
};

Callable<Object> c = Executors.callable(task);

Just found that, Executors provides utility method to convert Runnable task into a Callable task. That explains why we don't have overloaded invokeAll which takes Runnable task as well.

Related questions

FixedThreadPool vs CachedThreadPool: the lesser of two evils

I have a program that spawns threads (~5-150) which perform a bunch of tasks. Originally, I used a FixedThreadPool because this similar question suggested they were better suited for longer lived tasks and with my very limited knowledge of multithreading, …

Read More
How to give name to a callable Thread?

I am executing a Callable Object using ExecutorService thread pool. I want to give a name to this thread. To be more specific, in older version I did this - Thread thread = new Thread(runnable Task); thread.setName("My Thread …

Read More
ExecutorCompletionService? Why do need one if we have invokeAll?

If we use an ExecutorCompletionService we can submit a series of tasks as Callables and get the result interacting with the CompletionService as a queue. But there is also the invokeAll of ExecutorService that accepts a Collection of tasks and …

Read More