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add Mediator pattern

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Jakub Vojvoda
2016-09-25 00:31:26 +02:00
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## Mediator
Mediator pattern has behavioral purpose and applies on objects.
The pattern defines an object that encapsulates how a set of objects interact.
It promotes loose coupling by keeping objects from referring to each
other explicitly, and it lets you vary their interaction independently.
### When to use
* a set of objects communicate in well-defined but complex ways
* reusing an object is difficult because it refers to and communicates with many other objects
* a behavior that's distributed between several classes should be customizable without a lot of subclassing