Environment1 EnvironmentServer observes Environment1 Environment2 EnvironmentClient observes Environment2 Add Object1 to Environment1 Environment1 notifies EnvironmentServer of new Object1 EnvironmentServer sends Object1 to EnvironmentClient EnvironmentClient adds Object1 to Environment2 Environment2 notifies EnvironmentClient of new Object1 EnvironmentClient sends Object1 to EnvironmentServer

Screeeeee… Hold the phone. I just created a loop of object additions there.

The problem is that Environments are set up to notify their observers whenever an object is added, even if it came from that observer.

What I need is an entirely different model. Something that monitors the difference between two Environments, and then does the needed steps to synchronize them. Like a diff or an rsync or something.

I need to draw some diagrams or browse some source code or something, ‘cause an elegant solution eludes me.