A special Runnable (for the particular case of Total Order) that is only sent to a thread when it is ready to be
executed without blocking the thread
Use case: - in Total Order, when the prepare is delivered, the runnable blocks waiting for the previous conflicting
transactions to be finished. In a normal executor service, this will take a thread and that thread will be blocked.
This way, the runnable waits on the queue and not in the Thread
Used in
org.infinispan.util.concurrent.BlockingTaskAwareExecutorService