| A Comet filter, similar to regular filters, performs filtering tasks on either
the request to a resource (a Comet servlet), or on the response from a resource, or both.
Filters perform filtering in the doFilterEvent method. Every Filter has access to
a FilterConfig object from which it can obtain its initialization parameters, a
reference to the ServletContext which it can use, for example, to load resources
needed for filtering tasks.
Filters are configured in the deployment descriptor of a web application
Examples that have been identified for this design are
1) Authentication Filters
2) Logging and Auditing Filters
3) Image conversion Filters
4) Data compression Filters
5) Encryption Filters
6) Tokenizing Filters
7) Filters that trigger resource access events
8) XSL/T filters
9) Mime-type chain Filter
author:
Remy Maucherat
author:
Filip Hanik |