WithinThreadExecutor proposal

WithinThreadExecutor.java

public final class WithinThreadExecutor extends AbstractExecutorService {
   private volatile boolean shutDown = false;

   public void execute(Runnable command) {
      command.run();
   }

   public void shutdown() {
      shutDown = true;
   }

   public List<Runnable> shutdownNow() {
      shutDown = true;
      return Collections.emptyList();
   }

   public boolean isShutdown() {
      return shutDown;
   }

   public boolean isTerminated() {
      return shutDown;
   }

   public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
      return shutDown;
   }
}