1 files changed, 396 insertions, 0 deletions
diff --git a/sandbox/ant/sca/trunk/modules/implementation-node-runtime/src/main/java/org/apache/tuscany/sca/implementation/node/webapp/NodeWebAppServletHost.java b/sandbox/ant/sca/trunk/modules/implementation-node-runtime/src/main/java/org/apache/tuscany/sca/implementation/node/webapp/NodeWebAppServletHost.java
new file mode 100644
index 0000000000..5bf4f188f4
--- /dev/null
+++ b/sandbox/ant/sca/trunk/modules/implementation-node-runtime/src/main/java/org/apache/tuscany/sca/implementation/node/webapp/NodeWebAppServletHost.java
@@ -0,0 +1,396 @@
+/*
+ * 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.implementation.node.webapp;
+
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.net.InetAddress;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URL;
+import java.net.UnknownHostException;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Logger;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterConfig;
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.host.http.ServletHost;
+import org.apache.tuscany.sca.host.http.ServletHostExtensionPoint;
+import org.apache.tuscany.sca.host.http.ServletMappingException;
+import org.apache.tuscany.sca.implementation.node.launcher.NodeImplementationLauncherUtil;
+import org.apache.tuscany.sca.node.Client;
+import org.apache.tuscany.sca.node.Node;
+import org.apache.tuscany.sca.node.NodeFactory;
+
+/**
+ * ServletHost implementation for use in a Webapp Node environment.
+ * 
+ * @version $Rev$ $Date$
+ */
+public class NodeWebAppServletHost implements ServletHost, Filter {
+    private static final Logger logger = Logger.getLogger(NodeWebAppServletHost.class.getName());
+
+    private static final NodeWebAppServletHost servletHost = new NodeWebAppServletHost();
+
+    private Map<String, Servlet> servlets = new HashMap<String, Servlet>();
+    private Node node;
+    
+    private String contextPath = "/";
+    private int defaultPort = 8080;
+
+    /**
+     * Constructs a new NodeWebAppServletHost.
+     */
+    private NodeWebAppServletHost() {
+    }
+
+    /**
+     * Returns the Servlet host for the current Web app.
+     * 
+     * @return
+     */
+    public static NodeWebAppServletHost servletHost() {
+        return servletHost;
+    }
+
+    /**
+     * Initialize the Servlet host.
+     * 
+     * @param filterConfig
+     * @throws ServletException
+     */
+    public void init(final FilterConfig filterConfig) throws ServletException {
+        
+        // Create a Servlet config wrapping the given filter config
+        ServletConfig servletConfig = servletConfig(filterConfig);
+
+        // Get the Servlet context
+        ServletContext servletContext = servletConfig.getServletContext();
+
+        // Initialize the context path
+        contextPath = contextPath(servletContext);
+
+        // Derive the node name from the Webapp context path
+        String nodeName = contextPath;
+        if (nodeName.startsWith("/")) {
+            nodeName = nodeName.substring(1); 
+        }
+        if (nodeName.endsWith("/")) {
+            nodeName = nodeName.substring(0, nodeName.length() - 1); 
+        }
+        
+        // Determine the node configuration URI
+        String nodeConfiguration = NodeImplementationLauncherUtil.nodeConfigurationURI(nodeName);
+        
+        // Create the SCA node
+        NodeFactory nodeFactory = NodeFactory.newInstance();
+        node = nodeFactory.createNode(nodeConfiguration);
+        
+        // Register the Servlet host
+        ServletHostExtensionPoint servletHosts = servletHosts(node);
+        servletHosts.getServletHosts().clear();
+        servletHosts.addServletHost(servletHost);
+
+        // Save the node in the Servlet context 
+        servletContext.setAttribute(Client.class.getName(), node);
+        
+        // Start the node
+        node.start();
+
+        // Initialize the registered Servlets
+        for (Servlet servlet : servlets.values()) {
+            servlet.init(servletConfig);
+        }
+    }
+
+    public void addServletMapping(String suri, Servlet servlet) throws ServletMappingException {
+        URI pathURI = URI.create(suri);
+
+        // Make sure that the path starts with a /
+        suri = pathURI.getPath();
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        if (!suri.startsWith(contextPath)) {
+            suri = contextPath + suri;
+        }
+
+        // In a webapp just use the given path and ignore the host and port
+        // as they are fixed by the Web container
+        servlets.put(suri, servlet);
+
+        logger.info("Added Servlet mapping: " + suri);
+    }
+
+    public Servlet removeServletMapping(String suri) throws ServletMappingException {
+        URI pathURI = URI.create(suri);
+
+        // Make sure that the path starts with a /
+        suri = pathURI.getPath();
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        if (!suri.startsWith(contextPath)) {
+            suri = contextPath + suri;
+        }
+
+        // In a webapp just use the given path and ignore the host and port
+        // as they are fixed by the Web container
+        return servlets.remove(suri);
+    }
+
+    public Servlet getServletMapping(String suri) throws ServletMappingException {
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        if (!suri.startsWith(contextPath)) {
+            suri = contextPath + suri;
+        }
+
+        // Get the Servlet mapped to the given path
+        Servlet servlet = servlets.get(suri);
+        return servlet;
+    }
+
+    public URL getURLMapping(String suri) throws ServletMappingException {
+        URI uri = URI.create(suri);
+
+        // Get the URI scheme and port
+        String scheme = uri.getScheme();
+        if (scheme == null) {
+            scheme = "http";
+        }
+        int portNumber = uri.getPort();
+        if (portNumber == -1) {
+            portNumber = defaultPort;
+        }
+
+        // Get the host
+        String host;
+        try {
+            host = InetAddress.getLocalHost().getHostName();
+        } catch (UnknownHostException e) {
+            host = "localhost";
+        }
+
+        // Construct the URL
+        String path = uri.getPath();
+        if (!path.startsWith("/")) {
+            path = '/' + path;
+        }
+
+        if (contextPath != null && !path.startsWith(contextPath)) {
+            path = contextPath + path;
+        }
+
+        URL url;
+        try {
+            url = new URL(scheme, host, portNumber, path);
+        } catch (MalformedURLException e) {
+            throw new ServletMappingException(e);
+        }
+        return url;
+    }
+
+    public RequestDispatcher getRequestDispatcher(String suri) throws ServletMappingException {
+
+        // Make sure that the path starts with a /
+        if (!suri.startsWith("/")) {
+            suri = '/' + suri;
+        }
+
+        suri = contextPath + suri;
+
+        // Get the Servlet mapped to the given path
+        Servlet servlet = servlets.get(suri);
+        if (servlet != null) {
+            return new NodeWebAppRequestDispatcher(suri, servlet);
+        }
+
+        for (Map.Entry<String, Servlet> entry : servlets.entrySet()) {
+            String servletPath = entry.getKey();
+            if (servletPath.endsWith("*")) {
+                servletPath = servletPath.substring(0, servletPath.length() - 1);
+                if (suri.startsWith(servletPath)) {
+                    return new NodeWebAppRequestDispatcher(entry.getKey(), entry.getValue());
+                } else {
+                    if ((suri + "/").startsWith(servletPath)) {
+                        return new NodeWebAppRequestDispatcher(entry.getKey(), entry.getValue());
+                    }
+                }
+            }
+        }
+
+        // No Servlet found
+        return null;
+    }
+
+    /**
+     * Destroy the Servlet host.
+     * 
+     * @throws ServletException
+     */
+    public void destroy() {
+
+        // Destroy the registered Servlets
+        for (Servlet servlet : servlets.values()) {
+            servlet.destroy();
+        }
+
+        // Stop the node
+        if (node != null) {
+            node.stop();
+        }
+    }
+
+    public void doFilter(ServletRequest request, ServletResponse response, javax.servlet.FilterChain chain)
+        throws IOException, ServletException {
+
+        // Get the Servlet path
+        HttpServletRequest httpRequest = (HttpServletRequest)request;
+        String path = httpRequest.getPathInfo();
+        if (path == null) {
+            path = httpRequest.getServletPath();
+        }
+        if (path == null) {
+            path = "/";
+        }
+
+        // Get a request dispatcher for the Servlet mapped to that path
+        RequestDispatcher dispatcher = getRequestDispatcher(path);
+        if (dispatcher != null) {
+
+            // Let the dispatcher forward the request to the Servlet
+            dispatcher.forward(request, response);
+
+        } else {
+
+            // Proceed down the filter chain
+            chain.doFilter(request, response);
+        }
+    }
+
+    public void setDefaultPort(int port) {
+        defaultPort = port;
+    }
+
+    public int getDefaultPort() {
+        return defaultPort;
+    }
+
+    public String getContextPath() {
+        return contextPath;
+    }
+
+    public void setContextPath(String path) {
+        //this.contextPath = path;
+    }
+
+    /**
+     * Initializes the contextPath
+     * The 2.5 Servlet API has a getter for this, for pre 2.5 Servlet
+     * containers use an init parameter.
+     */
+    private static String contextPath(ServletContext context) {
+        String contextPath = "/";
+
+        // The getContextPath() is introduced since Servlet 2.5
+        Method m;
+        try {
+            // Try to get the method anyway since some ServletContext impl has this method even before 2.5
+            m = context.getClass().getMethod("getContextPath", new Class[] {});
+            contextPath = (String)m.invoke(context, new Object[] {});
+        } catch (Exception e) {
+            contextPath = context.getInitParameter("contextPath");
+            if (contextPath == null) {
+                logger.warning("Servlet level is: " + context.getMajorVersion() + "." + context.getMinorVersion());
+                throw new IllegalStateException(
+                                                "'contextPath' init parameter must be set for pre-2.5 servlet container");
+            }
+        }
+
+        logger.info("ContextPath: " + contextPath);
+        return contextPath;
+    }
+
+    /**
+     * Returns the Servlet host extension point used by the given node.
+     * 
+     * @return
+     */
+    private static ServletHostExtensionPoint servletHosts(Node node) {
+        //FIXME Need a clean way to get the extension point registry
+        // from the node
+        ExtensionPointRegistry registry;
+        try {
+            registry = (ExtensionPointRegistry)node.getClass().getMethod("getExtensionPointRegistry").invoke(node);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+        ServletHostExtensionPoint servletHosts = registry.getExtensionPoint(ServletHostExtensionPoint.class);
+        return servletHosts;
+    }
+
+    /**
+     * Returns a Servlet config wrapping a filter config.
+     * 
+     * @param filterConfig
+     * @return
+     */
+    private static ServletConfig servletConfig(final FilterConfig filterConfig) {
+        ServletConfig servletConfig = new ServletConfig() {
+            public String getInitParameter(String name) {
+                return filterConfig.getInitParameter(name);
+            }
+
+            public Enumeration getInitParameterNames() {
+                return filterConfig.getInitParameterNames();
+            }
+
+            public ServletContext getServletContext() {
+                return filterConfig.getServletContext();
+            }
+
+            public String getServletName() {
+                return filterConfig.getFilterName();
+            }
+        };
+        return servletConfig;
+    }
+
+    public void setAttribute(String name, Object value) {
+        // TODO Auto-generated method stub
+    }
+}