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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.context.webapp;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.tuscany.core.context.AggregateContext;
import org.apache.tuscany.core.context.EventContext;
/**
* Notifies the {@link org.apache.tuscany.core.context.AggregateContext} 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 $Rev$ $Date$
*/
public class TuscanyRequestFilter implements Filter {
private TuscanyWebAppRuntime tuscanyRuntime;
// ----------------------------------
// Constructors
// ----------------------------------
public TuscanyRequestFilter() {
}
// ----------------------------------
// Methods
// ----------------------------------
public void init(FilterConfig filterConfig) throws ServletException {
// Get the Tuscany runtime from the servlet context
tuscanyRuntime = (TuscanyWebAppRuntime) filterConfig.getServletContext().getAttribute(
TuscanyWebAppRuntime.class.getName());
}
public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws ServletException,
IOException {
// Get the module component context from the tuscany runtime
AggregateContext context = tuscanyRuntime.getModuleComponentContext();
try {
// Start the SCA implementation
tuscanyRuntime.start();
// Handle a request
if (request instanceof HttpServletRequest) {
if (((HttpServletRequest) request).getSession(false) != null) {
// A session is already active
context.fireEvent(EventContext.SESSION_NOTIFY, ((HttpServletRequest) request).getSession(true));
} else {
// Create a lazy wrapper since a session is not yet active
context.fireEvent(EventContext.SESSION_NOTIFY, new LazyHTTPSessionId((HttpServletRequest) request));
}
} else {
context.fireEvent(EventContext.SESSION_NOTIFY, request);
}
// Start processing the request
context.fireEvent(EventContext.REQUEST_START, request);
// Dispatch to the next filter
filterChain.doFilter(request, response);
} catch (Exception e) {
throw new ServletException(e);
} finally {
try {
// End processing the request
context.fireEvent(EventContext.REQUEST_END, request);
// Stop the SCA implementation
tuscanyRuntime.stop();
} catch (Exception e) {
throw new ServletException(e);
}
}
}
}
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