layout	pattern
title	Intercepting Filter
folder	intercepting-filter
permalink	/patterns/intercepting-filter/
pumlid	RSfB3i8m303Hgy014k-vZN5DQkIuaJ_q-fGzkz7JtCL8Q-DolUsPAnu0ZcSVadizAzZfi6JBJiS4qJenqU6D7smRXmnh2pFPBM1YN05o_KwyKcoqb-ZFEEcVz_BPLqtz0W00
categories	Behavioral
tags	Java Difficulty-Intermediate

Intent

Provide pluggable filters to conduct necessary pre-processing and post-processing to requests from a client to a target

Applicability

Use the Intercepting Filter pattern when

• a system uses pre-processing or post-processing requests
• a system should do the authentication/ authorization/ logging or tracking of request and then pass the requests to corresponding handlers
• you want a modular approach to configuring pre-processing and post-processing schemes

Real world examples

• javax.servlet.FilterChain and javax.servlet.Filter
• Struts 2 - Interceptors

Credits

• TutorialsPoint - Intercepting Filter
• Presentation Tier Patterns