Package org.eclipse.rdf4j.workbench.proxy

Class CacheFilter

  • All Implemented Interfaces:
    javax.servlet.Filter
    public class CacheFilter
extends Object
implements javax.servlet.Filter
    Resource cache expiry filter for Tomcat 6, based on code authored by Saket Kumar.
    Author:
    Dale Visser
    See Also:
    Enable Caching in Tomcat 6

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static long MAX_EXPIRY
      Maximum allowed expiry lifetime in seconds, set to one year according to the advice in RFC 2616.
      static long MIN_EXPIRY
      Minimum allowed expiry lifetime, zero, which corresponds to not caching at all.

    • Constructor Summary

      Constructors 
      Constructor Description
      CacheFilter()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void destroy()
      Make stored references available for garbage collection.
      void doFilter​(javax.servlet.ServletRequest req, javax.servlet.ServletResponse res, javax.servlet.FilterChain chain)
      Set a maximum expiry Cache-Control header applicable to the client and to intermediate caching servers.
      void init​(javax.servlet.FilterConfig config)
      Parse the Cache-Control configuration parameter as a long integer, and set the filter expiry value, modulo the minimum and maximum expiry constraints.

    • Field Detail

      • MAX_EXPIRY

        public static final long MAX_EXPIRY
        Maximum allowed expiry lifetime in seconds, set to one year according to the advice in RFC 2616.
        See Also:
        RFC 2616: HTTP/1.1, Constant Field Values

      • MIN_EXPIRY

        public static final long MIN_EXPIRY
        Minimum allowed expiry lifetime, zero, which corresponds to not caching at all.
        See Also:
        Constant Field Values

    • Constructor Detail

      • CacheFilter

        public CacheFilter()

    • Method Detail

      • doFilter

        public void doFilter​(javax.servlet.ServletRequest req,
                     javax.servlet.ServletResponse res,
                     javax.servlet.FilterChain chain)
              throws IOException,
                     javax.servlet.ServletException
        Set a maximum expiry Cache-Control header applicable to the client and to intermediate caching servers.
        Specified by:
        doFilter in interface javax.servlet.Filter
        Throws:
        IOException
        javax.servlet.ServletException

      • init

        public void init​(javax.servlet.FilterConfig config)
          throws javax.servlet.ServletException
        Parse the Cache-Control configuration parameter as a long integer, and set the filter expiry value, modulo the minimum and maximum expiry constraints. If the configuration parameter is not present, or not a valid long integer value, then no Cache-Control headers will be applied by the filter.
        Specified by:
        init in interface javax.servlet.Filter
        Throws:
        javax.servlet.ServletException
        See Also:
        MIN_EXPIRY, MAX_EXPIRY

      • destroy

        public void destroy()
        Make stored references available for garbage collection.
        Specified by:
        destroy in interface javax.servlet.Filter