*
* @param handler The body of the newly created actor's act method.
* @return A newly created instance of the BlockingActor class
*/
public final BlockingActor blockingActor(@DelegatesTo(BlockingActor.class) final Runnable handler) {
final BlockingActor actor = new RunnableBackedBlockingActor(handler);
actor.setParallelGroup(this);
actor.start();
return actor;
}