2015-08-13 23:54:40 +02:00
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---
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layout: pattern
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title: Front Controller
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folder: front-controller
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2015-08-15 18:03:05 +02:00
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permalink: /patterns/front-controller/
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2015-08-20 21:40:07 +02:00
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categories: Presentation Tier
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2015-12-28 15:52:44 +02:00
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tags:
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- Java
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- Difficulty-Intermediate
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2015-08-13 23:54:40 +02:00
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---
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2016-01-03 21:14:30 +01:00
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## Intent
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Introduce a common handler for all requests for a web site. This
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2015-08-13 23:54:40 +02:00
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way we can encapsulate common functionality such as security,
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internationalization, routing and logging in a single place.
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2016-01-03 21:14:30 +01:00
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## Applicability
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Use the Front Controller pattern when
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2015-08-13 23:54:40 +02:00
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* you want to encapsulate common request handling functionality in single place
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* you want to implements dynamic request handling i.e. change routing without modifying code
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* make web server configuration portable, you only need to register the handler web server specific way
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2016-01-03 21:14:30 +01:00
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## Real world examples
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2015-08-13 23:54:40 +02:00
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2015-08-15 18:03:05 +02:00
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* [Apache Struts](https://struts.apache.org/)
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2015-09-24 12:23:02 +05:30
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2016-01-03 21:14:30 +01:00
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## Credits
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2015-09-24 12:23:02 +05:30
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* [J2EE Design Patterns](http://www.amazon.com/J2EE-Design-Patterns-William-Crawford/dp/0596004273/ref=sr_1_2)
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* [Presentation Tier Patterns](http://www.javagyan.com/tutorials/corej2eepatterns/presentation-tier-patterns)
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* [Patterns of Enterprise Application Architecture](http://www.amazon.com/Patterns-Enterprise-Application-Architecture-Martin/dp/0321127420)
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