Netflix/RxJava — pull request #209 by johngmyers (2013-03-27 04:30:37+00:00)
Title: Implement cache operator

Returns an Observable that repeats the original Observable sequence to all subscribers.
The source Observable is subscribed to at most once.

When looking into integrating Hystrix and RxJava, the need for this operator became apparent. It appears to be of general use, so should be considered for RxJava core.