How to push all data to late subscribers?

Question

I would like to know if zmq already solves following problem (or) the application sitting on top of zmq needs to take care of it.

1) A central publisher which publishes data to all subscribers. This data is static in nature, something like configuration. The data can be modified at any point in time.
2) Multiple subscribers subscribe to messages from this publisher. The publisher can join at any point in time.
3) If data changes, publisher should just publish the diff to the existing subscribers.
4) If a subscriber joins later, the publisher should publish all the data (current configuration) to the new subscriber.

Zeromq guide suggests following for solving Slow Joiner syndrome but this does not solve above problem. http://zguide.zeromq.org/page:all#Slow-Subscriber-Detection-Suicidal-Snail-Pattern

Answer 1

The Clone pattern from the Guide does precisely what you want.