Tomcat example source code file (ApplicationDispatcher.java)
The Tomcat ApplicationDispatcher.java source code/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.core;
import java.io.IOException;
import java.io.PrintWriter;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.servlet.RequestDispatcher;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestWrapper;
import javax.servlet.ServletResponse;
import javax.servlet.ServletResponseWrapper;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.Context;
import org.apache.catalina.Globals;
import org.apache.catalina.InstanceEvent;
import org.apache.catalina.Wrapper;
import org.apache.catalina.connector.ClientAbortException;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.RequestFacade;
import org.apache.catalina.connector.Response;
import org.apache.catalina.connector.ResponseFacade;
import org.apache.catalina.util.InstanceSupport;
import org.apache.catalina.util.StringManager;
/**
* Standard implementation of <code>RequestDispatcher that allows a
* request to be forwarded to a different resource to create the ultimate
* response, or to include the output of another resource in the response
* from this resource. This implementation allows application level servlets
* to wrap the request and/or response objects that are passed on to the
* called resource, as long as the wrapping classes extend
* <code>javax.servlet.ServletRequestWrapper and
* <code>javax.servlet.ServletResponseWrapper.
*
* @author Craig R. McClanahan
* @version $Revision: 588477 $ $Date: 2007-10-26 04:37:39 +0200 (ven., 26 oct. 2007) $
*/
final class ApplicationDispatcher
implements RequestDispatcher {
protected class PrivilegedForward implements PrivilegedExceptionAction {
private ServletRequest request;
private ServletResponse response;
PrivilegedForward(ServletRequest request, ServletResponse response)
{
this.request = request;
this.response = response;
}
public Object run() throws java.lang.Exception {
doForward(request,response);
return null;
}
}
protected class PrivilegedInclude implements PrivilegedExceptionAction {
private ServletRequest request;
private ServletResponse response;
PrivilegedInclude(ServletRequest request, ServletResponse response)
{
this.request = request;
this.response = response;
}
public Object run() throws ServletException, IOException {
doInclude(request,response);
return null;
}
}
/**
* Used to pass state when the request dispatcher is used. Using instance
* variables causes threading issues and state is too complex to pass and
* return single ServletRequest or ServletResponse objects.
*/
private class State {
State(ServletRequest request, ServletResponse response,
boolean including) {
this.outerRequest = request;
this.outerResponse = response;
this.including = including;
}
/**
* The outermost request that will be passed on to the invoked servlet.
*/
ServletRequest outerRequest = null;
/**
* The outermost response that will be passed on to the invoked servlet.
*/
ServletResponse outerResponse = null;
/**
* The request wrapper we have created and installed (if any).
*/
ServletRequest wrapRequest = null;
/**
* The response wrapper we have created and installed (if any).
*/
ServletResponse wrapResponse = null;
/**
* Are we performing an include() instead of a forward()?
*/
boolean including = false;
/**
* Outer most HttpServletRequest in the chain
*/
HttpServletRequest hrequest = null;
/**
* Outermost HttpServletResponse in the chain
*/
HttpServletResponse hresponse = null;
}
// ----------------------------------------------------------- Constructors
/**
* Construct a new instance of this class, configured according to the
* specified parameters. If both servletPath and pathInfo are
* <code>null, it will be assumed that this RequestDispatcher
* was acquired by name, rather than by path.
*
* @param wrapper The Wrapper associated with the resource that will
* be forwarded to or included (required)
* @param requestURI The request URI to this resource (if any)
* @param servletPath The revised servlet path to this resource (if any)
* @param pathInfo The revised extra path information to this resource
* (if any)
* @param queryString Query string parameters included with this request
* (if any)
* @param name Servlet name (if a named dispatcher was created)
* else <code>null
*/
public ApplicationDispatcher
(Wrapper wrapper, String requestURI, String servletPath,
String pathInfo, String queryString, String name) {
super();
// Save all of our configuration parameters
this.wrapper = wrapper;
this.context = (Context) wrapper.getParent();
this.requestURI = requestURI;
this.servletPath = servletPath;
this.pathInfo = pathInfo;
this.queryString = queryString;
this.name = name;
if (wrapper instanceof StandardWrapper)
this.support = ((StandardWrapper) wrapper).getInstanceSupport();
else
this.support = new InstanceSupport(wrapper);
}
// ----------------------------------------------------- Instance Variables
/**
* The Context this RequestDispatcher is associated with.
*/
private Context context = null;
/**
* Descriptive information about this implementation.
*/
private static final String info =
"org.apache.catalina.core.ApplicationDispatcher/1.0";
/**
* The servlet name for a named dispatcher.
*/
private String name = null;
/**
* The extra path information for this RequestDispatcher.
*/
private String pathInfo = null;
/**
* The query string parameters for this RequestDispatcher.
*/
private String queryString = null;
/**
* The request URI for this RequestDispatcher.
*/
private String requestURI = null;
/**
* The servlet path for this RequestDispatcher.
*/
private String servletPath = null;
/**
* The StringManager for this package.
*/
private static final StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The InstanceSupport instance associated with our Wrapper (used to
* send "before dispatch" and "after dispatch" events.
*/
private InstanceSupport support = null;
/**
* The Wrapper associated with the resource that will be forwarded to
* or included.
*/
private Wrapper wrapper = null;
// ------------------------------------------------------------- Properties
/**
* Return the descriptive information about this implementation.
*/
public String getInfo() {
return (info);
}
// --------------------------------------------------------- Public Methods
/**
* Forward this request and response to another resource for processing.
* Any runtime exception, IOException, or ServletException thrown by the
* called servlet will be propogated to the caller.
*
* @param request The servlet request to be forwarded
* @param response The servlet response to be forwarded
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet exception occurs
*/
public void forward(ServletRequest request, ServletResponse response)
throws ServletException, IOException
{
if (Globals.IS_SECURITY_ENABLED) {
try {
PrivilegedForward dp = new PrivilegedForward(request,response);
AccessController.doPrivileged(dp);
} catch (PrivilegedActionException pe) {
Exception e = pe.getException();
if (e instanceof ServletException)
throw (ServletException) e;
throw (IOException) e;
}
} else {
doForward(request,response);
}
}
private void doForward(ServletRequest request, ServletResponse response)
throws ServletException, IOException
{
// Reset any output that has been buffered, but keep headers/cookies
if (response.isCommitted()) {
throw new IllegalStateException
(sm.getString("applicationDispatcher.forward.ise"));
}
try {
response.resetBuffer();
} catch (IllegalStateException e) {
throw e;
}
// Set up to handle the specified request and response
State state = new State(request, response, false);
if (Globals.STRICT_SERVLET_COMPLIANCE) {
// Check SRV.8.2 / SRV.14.2.5.1 compliance
checkSameObjects(request, response);
}
wrapResponse(state);
// Handle an HTTP named dispatcher forward
if ((servletPath == null) && (pathInfo == null)) {
ApplicationHttpRequest wrequest =
(ApplicationHttpRequest) wrapRequest(state);
HttpServletRequest hrequest = state.hrequest;
wrequest.setRequestURI(hrequest.getRequestURI());
wrequest.setContextPath(hrequest.getContextPath());
wrequest.setServletPath(hrequest.getServletPath());
wrequest.setPathInfo(hrequest.getPathInfo());
wrequest.setQueryString(hrequest.getQueryString());
processRequest(request,response,state);
}
// Handle an HTTP path-based forward
else {
ApplicationHttpRequest wrequest =
(ApplicationHttpRequest) wrapRequest(state);
String contextPath = context.getPath();
HttpServletRequest hrequest = state.hrequest;
if (hrequest.getAttribute(Globals.FORWARD_REQUEST_URI_ATTR) == null) {
wrequest.setAttribute(Globals.FORWARD_REQUEST_URI_ATTR,
hrequest.getRequestURI());
wrequest.setAttribute(Globals.FORWARD_CONTEXT_PATH_ATTR,
hrequest.getContextPath());
wrequest.setAttribute(Globals.FORWARD_SERVLET_PATH_ATTR,
hrequest.getServletPath());
wrequest.setAttribute(Globals.FORWARD_PATH_INFO_ATTR,
hrequest.getPathInfo());
wrequest.setAttribute(Globals.FORWARD_QUERY_STRING_ATTR,
hrequest.getQueryString());
}
wrequest.setContextPath(contextPath);
wrequest.setRequestURI(requestURI);
wrequest.setServletPath(servletPath);
wrequest.setPathInfo(pathInfo);
if (queryString != null) {
wrequest.setQueryString(queryString);
wrequest.setQueryParams(queryString);
}
processRequest(request,response,state);
}
// This is not a real close in order to support error processing
if (wrapper.getLogger().isDebugEnabled() )
wrapper.getLogger().debug(" Disabling the response for futher output");
if (response instanceof ResponseFacade) {
((ResponseFacade) response).finish();
} else {
// Servlet SRV.6.2.2. The Resquest/Response may have been wrapped
// and may no longer be instance of RequestFacade
if (wrapper.getLogger().isDebugEnabled()){
wrapper.getLogger().debug( " The Response is vehiculed using a wrapper: "
+ response.getClass().getName() );
}
// Close anyway
try {
PrintWriter writer = response.getWriter();
writer.close();
} catch (IllegalStateException e) {
try {
ServletOutputStream stream = response.getOutputStream();
stream.close();
} catch (IllegalStateException f) {
;
} catch (IOException f) {
;
}
} catch (IOException e) {
;
}
}
}
/**
* Prepare the request based on the filter configuration.
* @param request The servlet request we are processing
* @param response The servlet response we are creating
* @param state The RD state
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
private void processRequest(ServletRequest request,
ServletResponse response,
State state)
throws IOException, ServletException {
Integer disInt = (Integer) request.getAttribute
(ApplicationFilterFactory.DISPATCHER_TYPE_ATTR);
if (disInt != null) {
if (disInt.intValue() != ApplicationFilterFactory.ERROR) {
state.outerRequest.setAttribute
(ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
servletPath);
state.outerRequest.setAttribute
(ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
Integer.valueOf(ApplicationFilterFactory.FORWARD));
invoke(state.outerRequest, response, state);
} else {
invoke(state.outerRequest, response, state);
}
}
}
/**
* Include the response from another resource in the current response.
* Any runtime exception, IOException, or ServletException thrown by the
* called servlet will be propogated to the caller.
*
* @param request The servlet request that is including this one
* @param response The servlet response to be appended to
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet exception occurs
*/
public void include(ServletRequest request, ServletResponse response)
throws ServletException, IOException
{
if (Globals.IS_SECURITY_ENABLED) {
try {
PrivilegedInclude dp = new PrivilegedInclude(request,response);
AccessController.doPrivileged(dp);
} catch (PrivilegedActionException pe) {
Exception e = pe.getException();
if (e instanceof ServletException)
throw (ServletException) e;
throw (IOException) e;
}
} else {
doInclude(request,response);
}
}
private void doInclude(ServletRequest request, ServletResponse response)
throws ServletException, IOException
{
// Set up to handle the specified request and response
State state = new State(request, response, true);
if (Globals.STRICT_SERVLET_COMPLIANCE) {
// Check SRV.8.2 / SRV.14.2.5.1 compliance
checkSameObjects(request, response);
}
// Create a wrapped response to use for this request
wrapResponse(state);
// Handle an HTTP named dispatcher include
if (name != null) {
ApplicationHttpRequest wrequest =
(ApplicationHttpRequest) wrapRequest(state);
wrequest.setAttribute(Globals.NAMED_DISPATCHER_ATTR, name);
if (servletPath != null)
wrequest.setServletPath(servletPath);
wrequest.setAttribute(ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
Integer.valueOf(ApplicationFilterFactory.INCLUDE));
wrequest.setAttribute(
ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
servletPath);
invoke(state.outerRequest, state.outerResponse, state);
}
// Handle an HTTP path based include
else {
ApplicationHttpRequest wrequest =
(ApplicationHttpRequest) wrapRequest(state);
String contextPath = context.getPath();
if (requestURI != null)
wrequest.setAttribute(Globals.INCLUDE_REQUEST_URI_ATTR,
requestURI);
if (contextPath != null)
wrequest.setAttribute(Globals.INCLUDE_CONTEXT_PATH_ATTR,
contextPath);
if (servletPath != null)
wrequest.setAttribute(Globals.INCLUDE_SERVLET_PATH_ATTR,
servletPath);
if (pathInfo != null)
wrequest.setAttribute(Globals.INCLUDE_PATH_INFO_ATTR,
pathInfo);
if (queryString != null) {
wrequest.setAttribute(Globals.INCLUDE_QUERY_STRING_ATTR,
queryString);
wrequest.setQueryParams(queryString);
}
wrequest.setAttribute(ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
Integer.valueOf(ApplicationFilterFactory.INCLUDE));
wrequest.setAttribute(
ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
servletPath);
invoke(state.outerRequest, state.outerResponse, state);
}
}
// -------------------------------------------------------- Private Methods
/**
* Ask the resource represented by this RequestDispatcher to process
* the associated request, and create (or append to) the associated
* response.
* <p>
* <strong>IMPLEMENTATION NOTE: This implementation assumes
* that no filters are applied to a forwarded or included resource,
* because they were already done for the original request.
*
* @param request The servlet request we are processing
* @param response The servlet response we are creating
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
private void invoke(ServletRequest request, ServletResponse response,
State state) throws IOException, ServletException {
// Checking to see if the context classloader is the current context
// classloader. If it's not, we're saving it, and setting the context
// classloader to the Context classloader
ClassLoader oldCCL = Thread.currentThread().getContextClassLoader();
ClassLoader contextClassLoader = context.getLoader().getClassLoader();
if (oldCCL != contextClassLoader) {
Thread.currentThread().setContextClassLoader(contextClassLoader);
} else {
oldCCL = null;
}
// Initialize local variables we may need
HttpServletResponse hresponse = state.hresponse;
Servlet servlet = null;
IOException ioException = null;
ServletException servletException = null;
RuntimeException runtimeException = null;
boolean unavailable = false;
// Check for the servlet being marked unavailable
if (wrapper.isUnavailable()) {
wrapper.getLogger().warn(
sm.getString("applicationDispatcher.isUnavailable",
wrapper.getName()));
long available = wrapper.getAvailable();
if ((available > 0L) && (available < Long.MAX_VALUE))
hresponse.setDateHeader("Retry-After", available);
hresponse.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, sm
.getString("applicationDispatcher.isUnavailable", wrapper
.getName()));
unavailable = true;
}
// Allocate a servlet instance to process this request
try {
if (!unavailable) {
servlet = wrapper.allocate();
}
} catch (ServletException e) {
wrapper.getLogger().error(sm.getString("applicationDispatcher.allocateException",
wrapper.getName()), StandardWrapper.getRootCause(e));
servletException = e;
servlet = null;
} catch (Throwable e) {
wrapper.getLogger().error(sm.getString("applicationDispatcher.allocateException",
wrapper.getName()), e);
servletException = new ServletException
(sm.getString("applicationDispatcher.allocateException",
wrapper.getName()), e);
servlet = null;
}
// Get the FilterChain Here
ApplicationFilterFactory factory = ApplicationFilterFactory.getInstance();
ApplicationFilterChain filterChain = factory.createFilterChain(request,
wrapper,servlet);
// Call the service() method for the allocated servlet instance
try {
String jspFile = wrapper.getJspFile();
if (jspFile != null)
request.setAttribute(Globals.JSP_FILE_ATTR, jspFile);
else
request.removeAttribute(Globals.JSP_FILE_ATTR);
support.fireInstanceEvent(InstanceEvent.BEFORE_DISPATCH_EVENT,
servlet, request, response);
// for includes/forwards
if ((servlet != null) && (filterChain != null)) {
filterChain.doFilter(request, response);
}
// Servlet Service Method is called by the FilterChain
request.removeAttribute(Globals.JSP_FILE_ATTR);
support.fireInstanceEvent(InstanceEvent.AFTER_DISPATCH_EVENT,
servlet, request, response);
} catch (ClientAbortException e) {
request.removeAttribute(Globals.JSP_FILE_ATTR);
support.fireInstanceEvent(InstanceEvent.AFTER_DISPATCH_EVENT,
servlet, request, response);
ioException = e;
} catch (IOException e) {
request.removeAttribute(Globals.JSP_FILE_ATTR);
support.fireInstanceEvent(InstanceEvent.AFTER_DISPATCH_EVENT,
servlet, request, response);
wrapper.getLogger().error(sm.getString("applicationDispatcher.serviceException",
wrapper.getName()), e);
ioException = e;
} catch (UnavailableException e) {
request.removeAttribute(Globals.JSP_FILE_ATTR);
support.fireInstanceEvent(InstanceEvent.AFTER_DISPATCH_EVENT,
servlet, request, response);
wrapper.getLogger().error(sm.getString("applicationDispatcher.serviceException",
wrapper.getName()), e);
servletException = e;
wrapper.unavailable(e);
} catch (ServletException e) {
request.removeAttribute(Globals.JSP_FILE_ATTR);
support.fireInstanceEvent(InstanceEvent.AFTER_DISPATCH_EVENT,
servlet, request, response);
Throwable rootCause = StandardWrapper.getRootCause(e);
if (!(rootCause instanceof ClientAbortException)) {
wrapper.getLogger().error(sm.getString("applicationDispatcher.serviceException",
wrapper.getName()), rootCause);
}
servletException = e;
} catch (RuntimeException e) {
request.removeAttribute(Globals.JSP_FILE_ATTR);
support.fireInstanceEvent(InstanceEvent.AFTER_DISPATCH_EVENT,
servlet, request, response);
wrapper.getLogger().error(sm.getString("applicationDispatcher.serviceException",
wrapper.getName()), e);
runtimeException = e;
}
// Release the filter chain (if any) for this request
try {
if (filterChain != null)
filterChain.release();
} catch (Throwable e) {
wrapper.getLogger().error(sm.getString("standardWrapper.releaseFilters",
wrapper.getName()), e);
// FIXME: Exception handling needs to be simpiler to what is in the StandardWrapperValue
}
// Deallocate the allocated servlet instance
try {
if (servlet != null) {
wrapper.deallocate(servlet);
}
} catch (ServletException e) {
wrapper.getLogger().error(sm.getString("applicationDispatcher.deallocateException",
wrapper.getName()), e);
servletException = e;
} catch (Throwable e) {
wrapper.getLogger().error(sm.getString("applicationDispatcher.deallocateException",
wrapper.getName()), e);
servletException = new ServletException
(sm.getString("applicationDispatcher.deallocateException",
wrapper.getName()), e);
}
// Reset the old context class loader
if (oldCCL != null)
Thread.currentThread().setContextClassLoader(oldCCL);
// Unwrap request/response if needed
// See Bugzilla 30949
unwrapRequest(state);
unwrapResponse(state);
// Recycle request if necessary (also BZ 30949)
recycleRequestWrapper(state);
// Rethrow an exception if one was thrown by the invoked servlet
if (ioException != null)
throw ioException;
if (servletException != null)
throw servletException;
if (runtimeException != null)
throw runtimeException;
}
/**
* Unwrap the request if we have wrapped it.
*/
private void unwrapRequest(State state) {
if (state.wrapRequest == null)
return;
ServletRequest previous = null;
ServletRequest current = state.outerRequest;
while (current != null) {
// If we run into the container request we are done
if ((current instanceof Request)
|| (current instanceof RequestFacade))
break;
// Remove the current request if it is our wrapper
if (current == state.wrapRequest) {
ServletRequest next =
((ServletRequestWrapper) current).getRequest();
if (previous == null)
state.outerRequest = next;
else
((ServletRequestWrapper) previous).setRequest(next);
break;
}
// Advance to the next request in the chain
previous = current;
current = ((ServletRequestWrapper) current).getRequest();
}
}
/**
* Unwrap the response if we have wrapped it.
*/
private void unwrapResponse(State state) {
if (state.wrapResponse == null)
return;
ServletResponse previous = null;
ServletResponse current = state.outerResponse;
while (current != null) {
// If we run into the container response we are done
if ((current instanceof Response)
|| (current instanceof ResponseFacade))
break;
// Remove the current response if it is our wrapper
if (current == state.wrapResponse) {
ServletResponse next =
((ServletResponseWrapper) current).getResponse();
if (previous == null)
state.outerResponse = next;
else
((ServletResponseWrapper) previous).setResponse(next);
break;
}
// Advance to the next response in the chain
previous = current;
current = ((ServletResponseWrapper) current).getResponse();
}
}
/**
* Create and return a request wrapper that has been inserted in the
* appropriate spot in the request chain.
*/
private ServletRequest wrapRequest(State state) {
// Locate the request we should insert in front of
ServletRequest previous = null;
ServletRequest current = state.outerRequest;
while (current != null) {
if(state.hrequest == null && (current instanceof HttpServletRequest))
state.hrequest = (HttpServletRequest)current;
if ("org.apache.catalina.servlets.InvokerHttpRequest".
equals(current.getClass().getName()))
break; // KLUDGE - Make nested RD.forward() using invoker work
if (!(current instanceof ServletRequestWrapper))
break;
if (current instanceof ApplicationHttpRequest)
break;
if (current instanceof ApplicationRequest)
break;
if (current instanceof Request)
break;
previous = current;
current = ((ServletRequestWrapper) current).getRequest();
}
// Instantiate a new wrapper at this point and insert it in the chain
ServletRequest wrapper = null;
if ((current instanceof ApplicationHttpRequest) ||
(current instanceof Request) ||
(current instanceof HttpServletRequest)) {
// Compute a crossContext flag
HttpServletRequest hcurrent = (HttpServletRequest) current;
boolean crossContext = false;
if ((state.outerRequest instanceof ApplicationHttpRequest) ||
(state.outerRequest instanceof Request) ||
(state.outerRequest instanceof HttpServletRequest)) {
HttpServletRequest houterRequest =
(HttpServletRequest) state.outerRequest;
Object contextPath = houterRequest.getAttribute
(Globals.INCLUDE_CONTEXT_PATH_ATTR);
if (contextPath == null) {
// Forward
contextPath = houterRequest.getContextPath();
}
crossContext = !(context.getPath().equals(contextPath));
}
wrapper = new ApplicationHttpRequest
(hcurrent, context, crossContext);
} else {
wrapper = new ApplicationRequest(current);
}
if (previous == null)
state.outerRequest = wrapper;
else
((ServletRequestWrapper) previous).setRequest(wrapper);
state.wrapRequest = wrapper;
return (wrapper);
}
/**
* Create and return a response wrapper that has been inserted in the
* appropriate spot in the response chain.
*/
private ServletResponse wrapResponse(State state) {
// Locate the response we should insert in front of
ServletResponse previous = null;
ServletResponse current = state.outerResponse;
while (current != null) {
if(state.hresponse == null && (current instanceof HttpServletResponse)) {
state.hresponse = (HttpServletResponse)current;
if(!state.including) // Forward only needs hresponse
return null;
}
if (!(current instanceof ServletResponseWrapper))
break;
if (current instanceof ApplicationHttpResponse)
break;
if (current instanceof ApplicationResponse)
break;
if (current instanceof Response)
break;
previous = current;
current = ((ServletResponseWrapper) current).getResponse();
}
// Instantiate a new wrapper at this point and insert it in the chain
ServletResponse wrapper = null;
if ((current instanceof ApplicationHttpResponse) ||
(current instanceof Response) ||
(current instanceof HttpServletResponse))
wrapper =
new ApplicationHttpResponse((HttpServletResponse) current,
state.including);
else
wrapper = new ApplicationResponse(current, state.including);
if (previous == null)
state.outerResponse = wrapper;
else
((ServletResponseWrapper) previous).setResponse(wrapper);
state.wrapResponse = wrapper;
return (wrapper);
}
private void checkSameObjects(ServletRequest appRequest,
ServletResponse appResponse) throws ServletException {
ServletRequest originalRequest =
ApplicationFilterChain.getLastServicedRequest();
ServletResponse originalResponse =
ApplicationFilterChain.getLastServicedResponse();
// Some forwards, eg from valves will not set original values
if (originalRequest == null || originalResponse == null) {
return;
}
boolean same = false;
ServletRequest dispatchedRequest = appRequest;
//find the request that was passed into the service method
while (originalRequest instanceof ServletRequestWrapper &&
((ServletRequestWrapper) originalRequest).getRequest()!=null ) {
originalRequest =
((ServletRequestWrapper) originalRequest).getRequest();
}
//compare with the dispatched request
while (!same) {
if (originalRequest.equals(dispatchedRequest)) {
same = true;
}
if (!same && dispatchedRequest instanceof ServletRequestWrapper) {
dispatchedRequest =
((ServletRequestWrapper) dispatchedRequest).getRequest();
} else {
break;
}
}
if (!same) {
throw new ServletException(sm.getString(
"applicationDispatcher.specViolation.request"));
}
same = false;
ServletResponse dispatchedResponse = appResponse;
//find the response that was passed into the service method
while (originalResponse instanceof ServletResponseWrapper &&
((ServletResponseWrapper) originalResponse).getResponse() !=
null ) {
originalResponse =
((ServletResponseWrapper) originalResponse).getResponse();
}
//compare with the dispatched response
while (!same) {
if (originalResponse.equals(dispatchedResponse)) {
same = true;
}
if (!same && dispatchedResponse instanceof ServletResponseWrapper) {
dispatchedResponse =
((ServletResponseWrapper) dispatchedResponse).getResponse();
} else {
break;
}
}
if (!same) {
throw new ServletException(sm.getString(
"applicationDispatcher.specViolation.response"));
}
}
private void recycleRequestWrapper(State state) {
if (state.wrapRequest instanceof ApplicationHttpRequest) {
((ApplicationHttpRequest) state.wrapRequest).recycle(); }
}
}
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