28 lines
1005 B
Markdown
28 lines
1005 B
Markdown
---
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layout: pattern
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title: Mediator
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folder: mediator
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permalink: /patterns/mediator/
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categories: Behavioral
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tags:
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- Java
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- Gang Of Four
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- Difficulty-Intermediate
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---
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**Intent:** Define an object that encapsulates how a set of objects interact.
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Mediator promotes loose coupling by keeping objects from referring to each
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other explicitly, and it lets you vary their interaction independently.
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**Applicability:** Use the Mediator pattern when
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* a set of objects communicate in well-defined but complex ways. The resulting interdependencies are unstructured and difficult to understand
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* reusing an object is difficult because it refers to and communicates with many other objects
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* a behavior that's distributed between several classes should be customizable without a lot of subclassing
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**Credits**
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* [Design Patterns: Elements of Reusable Object-Oriented Software](http://www.amazon.com/Design-Patterns-Elements-Reusable-Object-Oriented/dp/0201633612)
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