FELIX-1962 Provide a ProxyListener analogous to the ProxyServlet to be called by the actual listener registered with the servlet container and to forward the events to the registered listeners.
git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1057094 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/http/proxy/src/main/java/org/apache/felix/http/proxy/DispatcherTracker.java b/http/proxy/src/main/java/org/apache/felix/http/proxy/DispatcherTracker.java
index 7552dc9..9901575 100644
--- a/http/proxy/src/main/java/org/apache/felix/http/proxy/DispatcherTracker.java
+++ b/http/proxy/src/main/java/org/apache/felix/http/proxy/DispatcherTracker.java
@@ -27,11 +27,11 @@
public final class DispatcherTracker
extends ServiceTracker
{
- private final static String DEFAULT_FILTER = "(http.felix.dispatcher=*)";
+ final static String DEFAULT_FILTER = "(http.felix.dispatcher=*)";
private final ServletConfig config;
private HttpServlet dispatcher;
-
+
public DispatcherTracker(BundleContext context, String filter, ServletConfig config)
throws Exception
{
diff --git a/http/proxy/src/main/java/org/apache/felix/http/proxy/ProxyListener.java b/http/proxy/src/main/java/org/apache/felix/http/proxy/ProxyListener.java
new file mode 100644
index 0000000..95b7760
--- /dev/null
+++ b/http/proxy/src/main/java/org/apache/felix/http/proxy/ProxyListener.java
@@ -0,0 +1,192 @@
+/*
+ * 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.felix.http.proxy;
+
+import java.util.EventListener;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+import javax.servlet.http.HttpSessionAttributeListener;
+import javax.servlet.http.HttpSessionBindingEvent;
+import javax.servlet.http.HttpSessionEvent;
+import javax.servlet.http.HttpSessionListener;
+
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.Constants;
+import org.osgi.framework.Filter;
+import org.osgi.framework.InvalidSyntaxException;
+import org.osgi.framework.ServiceReference;
+import org.osgi.util.tracker.ServiceTracker;
+
+/**
+ * The <code>ProxyListener</code> implements a Servlet API listener for HTTP
+ * Session related events. These events are provided by the servlet container
+ * and forwarded to the event dispatcher.
+ */
+public class ProxyListener implements HttpSessionAttributeListener, HttpSessionListener, ServletContextListener
+{
+
+ private ServletContext servletContext;
+
+ private ServiceTracker eventDispatcherTracker;
+
+ private HttpSessionListener sessionDispatcher;
+
+ private HttpSessionAttributeListener attributeDispatcher;
+
+ // ---------- ServletContextListener
+
+ public void contextInitialized(final ServletContextEvent sce)
+ {
+ this.servletContext = sce.getServletContext();
+ }
+
+ public void contextDestroyed(final ServletContextEvent sce)
+ {
+ if (this.eventDispatcherTracker != null)
+ {
+ this.eventDispatcherTracker.close();
+ this.eventDispatcherTracker = null;
+ }
+ this.servletContext = null;
+ }
+
+ // ---------- HttpSessionListener
+
+ public void sessionCreated(final HttpSessionEvent se)
+ {
+ final HttpSessionListener sessionDispatcher = getSessionDispatcher();
+ if (sessionDispatcher != null)
+ {
+ sessionDispatcher.sessionCreated(se);
+ }
+ }
+
+ public void sessionDestroyed(final HttpSessionEvent se)
+ {
+ final HttpSessionListener sessionDispatcher = getSessionDispatcher();
+ if (sessionDispatcher != null)
+ {
+ sessionDispatcher.sessionDestroyed(se);
+ }
+ }
+
+ // ---------- HttpSessionAttributeListener
+
+ public void attributeAdded(final HttpSessionBindingEvent se)
+ {
+ final HttpSessionAttributeListener attributeDispatcher = getAttributeDispatcher();
+ if (attributeDispatcher != null)
+ {
+ attributeDispatcher.attributeAdded(se);
+ }
+ }
+
+ public void attributeRemoved(final HttpSessionBindingEvent se)
+ {
+ final HttpSessionAttributeListener attributeDispatcher = getAttributeDispatcher();
+ if (attributeDispatcher != null)
+ {
+ attributeDispatcher.attributeRemoved(se);
+ }
+ }
+
+ public void attributeReplaced(final HttpSessionBindingEvent se)
+ {
+ final HttpSessionAttributeListener attributeDispatcher = getAttributeDispatcher();
+ if (attributeDispatcher != null)
+ {
+ attributeDispatcher.attributeReplaced(se);
+ }
+ }
+
+ // ---------- internal
+
+ private Object getDispatcher()
+ {
+ if (this.eventDispatcherTracker == null)
+ {
+ // the bundle context may or may not be already provided;
+ // if not we cannot access the dispatcher yet
+ Object bundleContextAttr = this.servletContext.getAttribute(BundleContext.class.getName());
+ if (!(bundleContextAttr instanceof BundleContext))
+ {
+ return null;
+ }
+
+ try
+ {
+ BundleContext bundleContext = (BundleContext) bundleContextAttr;
+ Filter filter = createFilter(bundleContext, null);
+ this.eventDispatcherTracker = new ServiceTracker(bundleContext, filter, null)
+ {
+ public void removedService(ServiceReference reference, Object service)
+ {
+ ProxyListener.this.sessionDispatcher = null;
+ ProxyListener.this.attributeDispatcher = null;
+ super.removedService(reference, service);
+ }
+ };
+ this.eventDispatcherTracker.open();
+ }
+ catch (InvalidSyntaxException e)
+ {
+ // not expected for our simple filter
+ }
+
+ }
+ return this.eventDispatcherTracker.getService();
+ }
+
+ private HttpSessionListener getSessionDispatcher()
+ {
+ if (this.sessionDispatcher == null)
+ {
+ final Object dispatcher = getDispatcher();
+ if (dispatcher instanceof HttpSessionListener)
+ {
+ this.sessionDispatcher = (HttpSessionListener) dispatcher;
+ }
+ }
+ return this.sessionDispatcher;
+ }
+
+ private HttpSessionAttributeListener getAttributeDispatcher()
+ {
+ if (this.attributeDispatcher == null)
+ {
+ final Object dispatcher = getDispatcher();
+ if (dispatcher instanceof HttpSessionAttributeListener)
+ {
+ this.attributeDispatcher = (HttpSessionAttributeListener) dispatcher;
+ }
+ }
+ return this.attributeDispatcher;
+ }
+
+ private static Filter createFilter(BundleContext context, String filter) throws InvalidSyntaxException
+ {
+ StringBuffer str = new StringBuffer();
+ str.append("(&(").append(Constants.OBJECTCLASS).append("=");
+ str.append(EventListener.class.getName()).append(")");
+ str.append(filter != null ? filter : DispatcherTracker.DEFAULT_FILTER).append(")");
+ return context.createFilter(str.toString());
+ }
+}