How to make ThreadPoolExecutor's submit() method block if it is saturated?

Question

I want to create a ThreadPoolExecutor such that when it has reached its maximum size and the queue is full, the submit() method blocks when trying to add new tasks. Do I need to implement a custom RejectedExecutionHandler for that or is there an existing way to do this using a standard Java library?

Answer 1

One of the possible solutions I've just found:

public class BoundedExecutor {     private final Executor exec;     private final Semaphore semaphore;      public BoundedExecutor(Executor exec, int bound) {         this.exec = exec;         this.semaphore = new Semaphore(bound);     }      public void submitTask(final Runnable command)             throws InterruptedException, RejectedExecutionException {         semaphore.acquire();         try {             exec.execute(new Runnable() {                 public void run() {                     try {                         command.run();                     } finally {                         semaphore.release();                     }                 }             });         } catch (RejectedExecutionException e) {             semaphore.release();             throw e;         }     } } 

Are there any other solutions? I'd prefer something based on RejectedExecutionHandler since it seems like a standard way to handle such situations.