# What is Mediator Design Pattern 
The Mediator design pattern enables the centralised communication between related objects (Colleagues). All communication is handled by a Mediator Object and the Colleagues don't need to know anything about each other to work together.

## Diagram
![Diagram](https://github.com/premaseem/DesignPatternsJava9/blob/mediator-pattern/diagrams/Mediator%20Design%20Pattern%20communication%20diagram.png "Diagram")

![Diagram](https://github.com/premaseem/DesignPatternsJava9/blob/mediator-pattern/diagrams/Mediator-Design-Pattern-general.png "Diagram")

![Diagram](https://github.com/premaseem/DesignPatternsJava9/blob/mediator-pattern/diagrams/Mediator%20pattern%20sequence%20diagram.png "Diagram")

![Diagram](https://github.com/premaseem/DesignPatternsJava9/blob/mediator-pattern/diagrams/aircraft.jpg "Diagram")

# When to use Mediator Design Pattern 
* when the communication logic between objects is complex, we can have a central point of communication using Mediator object. 
* JMS- Java Message Service uses mediator pattern underneath. 

### Learn Design Patterns with Java by Aseem Jain
This repository contains working project code used in video Course by Packt Publication with title "Learn Design Patterns with Java " authored by "Aseem Jain".

### Course link: 
https://www.packtpub.com/application-development/learn-design-patterns-java-9-video

### ![ http://in.linkedin.com/in/premaseem](https://github.com/premaseem/DesignPatternsJava9/blob/master/linkedin.png "http://in.linkedin.com/in/premaseem") Profile:  http://in.linkedin.com/in/premaseem

### Authors blog on design patterns:
https://premaseem.wordpress.com/category/computers/design-patterns/

### Software Design pattern community face book page:
https://www.facebook.com/DesignPatternGuru/

### Note: 
* This code base will work on Java 9 and above versions. 
* `diagrams` folders carry UML diagrams.
* `pattern` folder has code of primary example. 
* `patternBonus` folder has code of secondary or bonus example.