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java-design-patterns/front-controller/README.md

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pattern Front Controller front-controller /patterns/front-controller/ PSlB3OGm303HLfO24j-t6nCC13bEvC_IFk6yjz6JPgbIE3OAvS_fFkmBe7Zde_ePQnXfwU8adajlK3bkT5Iuy8Tf8wk7f87kf6BGq6R0hlD8xwQTUG9v-SCSslA8nWy0 Presentation Tier
Java
Difficulty-Intermediate

Intent

Introduce a common handler for all requests for a web site. This way we can encapsulate common functionality such as security, internationalization, routing and logging in a single place.

alt text

Applicability

Use the Front Controller pattern when

  • you want to encapsulate common request handling functionality in single place
  • you want to implements dynamic request handling i.e. change routing without modifying code
  • make web server configuration portable, you only need to register the handler web server specific way

Real world examples

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