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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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
* 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.tuscany.core.webapp;
import org.apache.tuscany.core.context.CompositeContext;
import org.apache.tuscany.core.context.event.HttpSessionBound;
import org.apache.tuscany.core.context.event.RequestStart;
import org.apache.tuscany.core.context.event.RequestEnd;
import org.osoa.sca.CurrentModuleContext;
import org.osoa.sca.ModuleContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.Filter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.FilterConfig;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import javax.servlet.ServletRequest;
import java.io.IOException;
/**
* Notifies the {@link org.apache.tuscany.core.context.CompositeContext} of web request start and end events as well as setting up the
* current session context. The latter is done using lazy Servlet-based session retrieval. The filter fires a session
* start event, passing a <tt>LazyServletSessionId</tt> as the session id. The <tt>LazyServletSessionId</tt> is a
* wrapper for the servlet request which may be called by the <tt>ModuleContext</tt> to retrieve the session id
* lazily.
*
* @version $Rev: 379957 $ $Date: 2006-02-22 14:58:24 -0800 (Wed, 22 Feb 2006) $
*/
public class TuscanyRequestFilter implements Filter {
private CompositeContext moduleContext;
public TuscanyRequestFilter() {
}
public void init(FilterConfig filterConfig) throws ServletException {
ServletContext servletContext = filterConfig.getServletContext();
moduleContext = (CompositeContext) servletContext.getAttribute(TuscanyServletListener.MODULE_COMPONENT_NAME);
}
public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws ServletException, IOException {
ModuleContext oldContext = CurrentModuleContext.getContext();
try {
// Set the current module context
ContextBinder.BINDER.setContext((ModuleContext) moduleContext);
// Handle a request
if (request instanceof HttpServletRequest) {
if (((HttpServletRequest) request).getSession(false) != null) {
// A session is already active
moduleContext.publish(new HttpSessionBound(this, ((HttpServletRequest) request).getSession(true)));
} else {
// Create a lazy wrapper since a session is not yet active
moduleContext.publish(new HttpSessionBound(this, new LazyHTTPSessionId((HttpServletRequest) request)));
}
} else {
moduleContext.publish(new HttpSessionBound(this, request));
}
// Start processing the request
moduleContext.publish(new RequestStart(this, request));
// Dispatch to the next filter
filterChain.doFilter(request, response);
} catch (Exception e) {
throw new ServletException(e);
} finally {
try {
// End processing the request
moduleContext.publish(new RequestEnd(this, request));
} catch (Exception e) {
throw new ServletException(e);
}
ContextBinder.BINDER.setContext(oldContext);
}
}
}
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