What is the BlockingCallbackStore
Remoting also offers the BlockingCallbackStore, which is described as follows. This callback store does not persist callback messages when memory is running low, but instead will block the thread making the handle callback call from the server invoker. The intention is that this will throttle the server invoker from generating/sending any more callbacks until client as called to get the in-memory callbacks that have already been collected and memory has been released.