distributed implementation of Observer pattern in native c++

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if the Observer (publisher) and Subject (subscriber) are on different process
ex. publisher application is running on one pc and the subscriber process in another pc how can i implement both observer and subscriber so that the subscriber can subscribe and the observer can notify ?

the concept which described here is for local application (where both applications are on same process )

thanks!

Posted 10-Nov-11 3:18am

ephrem33

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Orjan Westin · Accepted Answer · 2011-11-10T04:21:00

The usual way to do this is via network sockets. The observers would connect to a network port on the subject PC, and the subject would pass notifications to all observers.

Since there's no standard C++ socket API, so how to code it exactly depends on your platform, but pretty much every OS has a variant of the Berkerley socket. There's a good introduction to it here: http://www.troubleshooters.com/codecorn/sockets/[^]

The next problem is how to transfer data from subject to observers, since you can't send pointers to areas of shared memory over the network. For this, you'll have to come up with a suitable protocol, which would normally be text-based.