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java-design-patterns/intercepting-filter/index.md
Markus fdb9be1e76 Work towards #56: Add permalink to every pattern 
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layout, title, folder, permalink, categories, tags
layout title folder permalink categories tags
pattern Intercepting Filter intercepting-filter /patterns/intercepting-filter/ pattern_cat pattern_tag

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

alt text

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