1 files changed, 198 insertions, 0 deletions
diff --git a/tags/java/sca/2.0-M4-RC2/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java b/tags/java/sca/2.0-M4-RC2/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java
new file mode 100644
index 0000000000..04b2f4c199
--- /dev/null
+++ b/tags/java/sca/2.0-M4-RC2/modules/host-http/src/main/java/org/apache/tuscany/sca/host/http/DefaultServletHostExtensionPoint.java
@@ -0,0 +1,198 @@
+/*
+ * 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.tuscany.sca.host.http;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.LifeCycleListener;
+import org.apache.tuscany.sca.extensibility.ServiceDeclaration;
+import org.apache.tuscany.sca.extensibility.ServiceDiscovery;
+
+/**
+ * Default implementation of a Servlet host extension point.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class DefaultServletHostExtensionPoint implements ServletHostExtensionPoint, LifeCycleListener {
+
+    private List<ServletHost> servletHosts = new ArrayList<ServletHost>();
+    private boolean loaded;
+
+    private ExtensionPointRegistry registry;
+
+    public DefaultServletHostExtensionPoint(ExtensionPointRegistry registry) {
+        this.registry = registry;
+    }
+
+    public void addServletHost(ServletHost servletHost) {
+        servletHosts.add(servletHost);
+        if (servletHost instanceof LifeCycleListener) {
+            ((LifeCycleListener)servletHost).start();
+        }
+    }
+
+    public void removeServletHost(ServletHost servletHost) {
+        servletHosts.remove(servletHost);
+        if (servletHost instanceof LifeCycleListener) {
+            ((LifeCycleListener)servletHost).stop();
+        }
+    }
+
+    public List<ServletHost> getServletHosts() {
+        loadServletHosts();
+        return servletHosts;
+    }
+
+    private synchronized void loadServletHosts() {
+        if (loaded)
+            return;
+
+        // Get the databinding service declarations
+        Collection<ServiceDeclaration> sds;
+        try {
+            sds = registry.getServiceDiscovery().getServiceDeclarations(ServletHost.class, true);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+
+        // Load data bindings
+        for (ServiceDeclaration sd : sds) {
+            // Create a data binding wrapper and register it
+            ServletHost servletHost = new LazyServletHost(sd);
+            addServletHost(servletHost);
+        }
+
+        loaded = true;
+    }
+
+    /**
+     * A data binding facade allowing data bindings to be lazily loaded and
+     * initialized.
+     */
+    public class LazyServletHost implements ServletHost, LifeCycleListener {
+        private ServiceDeclaration sd;
+        private ServletHost host;
+
+        /**
+         * @param sd
+         */
+        public LazyServletHost(ServiceDeclaration sd) {
+            super();
+            this.sd = sd;
+        }
+
+        public synchronized ServletHost getServletHost() {
+            if (host == null) {
+                try {
+                    Class<?> cls = sd.loadClass();
+                    Constructor<?> ctor = null;
+                    try {
+                        ctor = cls.getConstructor(ExtensionPointRegistry.class);
+                        host = (ServletHost)ctor.newInstance(registry);
+                    } catch (NoSuchMethodException e) {
+                        ctor = cls.getConstructor();
+                        host = (ServletHost)ctor.newInstance();
+                    }
+                    if(host instanceof LifeCycleListener) {
+                        ((LifeCycleListener) host).start();
+                    }
+                } catch (Throwable e) {
+                    throw new IllegalStateException(e);
+                }
+            }
+            return host;
+        }
+
+        public void addServletMapping(String uri, Servlet servlet) throws ServletMappingException {
+            getServletHost().addServletMapping(uri, servlet);
+        }
+
+        public String getContextPath() {
+            return getServletHost().getContextPath();
+        }
+
+        public int getDefaultPort() {
+            return getServletHost().getDefaultPort();
+        }
+
+        public RequestDispatcher getRequestDispatcher(String uri) throws ServletMappingException {
+            return getServletHost().getRequestDispatcher(uri);
+        }
+
+        public Servlet getServletMapping(String uri) throws ServletMappingException {
+            return getServletHost().getServletMapping(uri);
+        }
+
+        public URL getURLMapping(String uri) {
+            return getServletHost().getURLMapping(uri);
+        }
+
+        public Servlet removeServletMapping(String uri) throws ServletMappingException {
+            return getServletHost().removeServletMapping(uri);
+        }
+
+        public void setAttribute(String name, Object value) {
+            getServletHost().setAttribute(name, value);
+        }
+
+        public void setContextPath(String path) {
+            getServletHost().setContextPath(path);
+        }
+
+        public void setDefaultPort(int port) {
+            getServletHost().setDefaultPort(port);
+        }
+        
+        public String getName() {
+            return sd.getAttributes().get("name");
+        }
+
+        public void start() {
+        }
+
+        public void stop() {
+            if (host instanceof LifeCycleListener) {
+                ((LifeCycleListener)host).stop();
+            }
+        }
+    }
+
+    public void start() {
+    }
+
+    public void stop() {
+        for (ServletHost host : servletHosts) {
+            if (host instanceof LifeCycleListener) {
+                ((LifeCycleListener)host).stop();
+            }
+        }
+        servletHosts.clear();
+        registry = null;
+    }
+}