All Known Implementing Classes:
    StandardValveContext

A ValveContext is the mechanism by which a Valve can trigger the execution of the next Valve in a Pipeline, without having to know anything about the internal implementation mechanisms. An instance of a class implementing this interface is passed as a parameter to the Valve.invoke() method of each executed Valve.

IMPLEMENTATION NOTE: It is up to the implementation of ValveContext to ensure that simultaneous requests being processed (by separate threads) through the same Pipeline do not interfere with each other's flow of control.

author: Craig - R. McClanahan

author: Gunnar - Rjnning

author: Peter - Donald

version: $ - Revision: 1.3 $ $Date: 2007/05/05 05:31:52 $

 public String getInfo()
Return descriptive information about this ValveContext implementation.

 public  void invokeNext(Request request,
    Response response) throws IOException, ServletException
Cause the invoke() method of the next Valve that is part of
the Pipeline currently being processed (if any) to be executed, passing
on the specified request and response objects plus this
ValveContext instance. Exceptions thrown by a subsequently
executed Valve (or a Filter or Servlet at the application level) will be
passed on to our caller.

If there are no more Valves to be executed, an appropriate
ServletException will be thrown by this ValveContext.