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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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*
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*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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package org.glassfish.web.valve;
import org.apache.catalina.Request;
import org.apache.catalina.Response;
import javax.servlet.ServletException;
import java.io.IOException;
/**
* A Valve is a request processing component associated with a
* particular Container. A series of Valves are generally associated with
* each other into a Pipeline. The detailed contract for a Valve is included
* in the description of the invoke()
method below.
*
* HISTORICAL NOTE: The "Valve" name was assigned to this concept
* because a valve is what you use in a real world pipeline to control and/or
* modify flows through it.
*
* @author Craig R. McClanahan
* @author Gunnar Rjnning
* @author Peter Donald
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:27:21 $
*/
public interface GlassFishValve {
// ----------------------------------------------------- Manifest Constants
/**
* A valve returns this value to indicate (to the pipeline) that the next
* valve in the pipeline can be invoked.
*/
public static final int INVOKE_NEXT = 1;
/**
* A valve returns this value to indicate that no further processing
* of the request should take place (along the rest of the pipeline).
* All valves that are function as 'basic' valves return this value
* as they are the 'last' valve in the pipeline. A valve (such as an
* authenticator) may return this value to stop a request from being
* processed further because the user/password could not be verified.
*/
public static final int END_PIPELINE = 2;
//-------------------------------------------------------------- Properties
/**
* Return descriptive information about this Valve implementation.
*/
public String getInfo();
//---------------------------------------------------------- Public Methods
/**
* Perform request processing as required by this Valve.
*
* An individual Valve MAY perform the following actions, in
* the specified order:
*
* - Examine and/or modify the properties of the specified Request and
* Response.
*
- Examine the properties of the specified Request, completely generate
* the corresponding Response, and return control to the caller.
*
- Examine the properties of the specified Request and Response, wrap
* either or both of these objects to supplement their functionality,
* and pass them on.
*
- If the corresponding Response was not generated (and control was not
* returned, call the next Valve in the pipeline (if there is one) by
* executing
context.invokeNext()
.
* - Examine, but not modify, the properties of the resulting Response
* (which was created by a subsequently invoked Valve or Container).
*
*
* A Valve MUST NOT do any of the following things:
*
* - Change request properties that have already been used to direct
* the flow of processing control for this request (for instance,
* trying to change the virtual host to which a Request should be
* sent from a pipeline attached to a Host or Context in the
* standard implementation).
*
- Create a completed Response AND pass this
* Request and Response on to the next Valve in the pipeline.
*
- Consume bytes from the input stream associated with the Request,
* unless it is completely generating the response, or wrapping the
* request before passing it on.
*
- Modify the HTTP headers included with the Response after the
*
invokeNext()
method has returned.
* - Perform any actions on the output stream associated with the
* specified Response after the
invokeNext()
method has
* returned.
*
*
* @param request The servlet request to be processed
* @param response The servlet response to be created
*
* @exception IOException if an input/output error occurs, or is thrown
* by a subsequently invoked Valve, Filter, or Servlet
* @exception ServletException if a servlet error occurs, or is thrown
* by a subsequently invoked Valve, Filter, or Servlet
*
* @return INVOKE_NEXT
or END_PIPELINE
*/
public int invoke(Request request, Response response)
throws IOException, ServletException;
/**
* Perform post-request processing as required by this Valve.
*
* @param request The servlet request to be processed
* @param response The servlet response to be created
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
public void postInvoke(Request request, Response response)
throws IOException, ServletException;
}