1 files changed, 107 insertions, 0 deletions
diff --git a/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/webapp/TuscanyRequestFilter.java b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/webapp/TuscanyRequestFilter.java
new file mode 100644
index 0000000000..8e92c9ebd4
--- /dev/null
+++ b/sca-java-1.x/tags/java-stable-20060304/sca/core/src/main/java/org/apache/tuscany/core/context/webapp/TuscanyRequestFilter.java
@@ -0,0 +1,107 @@
+/**
+ *
+ *  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);
+            }
+        }
+
+    }
+
+}