Observables

[fahad siddiqui]

Observables are not threads rite? they get invoked sequentially and there do any further processing also sequentially, not parallely.
Am i right on this?

[Jim Yingst]

Correct, Observables are not threads, and they do not create any new threads. When notifyObservers() is called, the Observable calls update() for each Observer in the same thread that was used to call notifyObservers(), sequentially. There may still be other things happening in parallel if your program is already using multiple threads. An Observer can function in a multi-threaded environment, but it does not create any new threads itself.

[Stan James]

 

... but it does not create any new threads itself.

Well, it can start a new thread if it wants to. It's not automatic or built in by any means but it is a good thing in some situations to move the reaction to the event to another thread.