Copying modules from Equinox branch, to start merging the delta changes from 1.x/original trunk

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@718815 13f79535-47bb-0310-9956-ffa450edef68

8 files changed, 867 insertions, 0 deletions

diff --git a/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/TuscanyServletFilter.java b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/TuscanyServletFilter.java
new file mode 100644
index 0000000000..cb4369fc01
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/TuscanyServletFilter.java
@@ -0,0 +1,122 @@
+/*
+ * 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.webapp;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Enumeration;
+import java.util.Map;
+import java.util.WeakHashMap;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterConfig;
+import javax.servlet.RequestDispatcher;
+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.host.http.ServletHost;
+
+/**
+ * A Servlet filter that forwards service requests to the Servlets registered with
+ * the Tuscany ServletHost.
+ *
+ * @version $Rev$ $Date$
+ */
+public class TuscanyServletFilter implements Filter {
+    private static final long serialVersionUID = 1L;
+    //private static final Logger logger = Logger.getLogger(WebAppServletHost.class.getName());
+
+    private static Map<ClassLoader, ServletHost> servletHosts =
+        Collections.synchronizedMap(new WeakHashMap<ClassLoader, ServletHost>());
+
+    // [REVIEW] Assume the filter class is per webapp
+    private static WebAppServletHost servletHost;
+
+    // Test if the servletHost == null to know if the filter is called (webapp)
+    static ServletHost getServletHost() {
+        return servletHosts.get(Thread.currentThread().getContextClassLoader());
+    }
+
+    public void init(final FilterConfig config) throws ServletException {
+        // TODO: must be a better way to get this than using a static
+        servletHost = new WebAppServletHost();
+        servletHosts.put(Thread.currentThread().getContextClassLoader(), servletHost);
+
+        // Initialize the Servlet host
+        servletHost.init(new ServletConfig() {
+            public String getInitParameter(String name) {
+                return config.getInitParameter(name);
+            }
+
+            public Enumeration getInitParameterNames() {
+                return config.getInitParameterNames();
+            }
+
+            public ServletContext getServletContext() {
+                return config.getServletContext();
+            }
+
+            public String getServletName() {
+                return config.getFilterName();
+            }
+        });
+    }
+
+    public void destroy() {
+        if (servletHost != null) {
+            servletHost.destroy();
+            servletHost = null;
+            servletHosts.remove(Thread.currentThread().getContextClassLoader());
+        }
+    }
+
+    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 = servletHost.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);
+
+        }
+    }
+
+}
diff --git a/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppModuleActivator.java b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppModuleActivator.java
new file mode 100644
index 0000000000..88caa33f2a
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppModuleActivator.java
@@ -0,0 +1,52 @@
+/*
+ * 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.webapp;
+
+import java.util.List;
+
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.core.ModuleActivator;
+import org.apache.tuscany.sca.host.http.ServletHost;
+import org.apache.tuscany.sca.host.http.ServletHostExtensionPoint;
+
+/**
+ * Activates the webapp host by registering the webapp ServletHost impl
+ *
+ * @version $Rev$ $Date$
+ */
+public class WebAppModuleActivator implements ModuleActivator {
+
+    public void start(ExtensionPointRegistry extensionPointRegistry) {
+
+        ServletHostExtensionPoint servletHosts =
+            extensionPointRegistry.getExtensionPoint(ServletHostExtensionPoint.class);
+
+        List<ServletHost> hosts = servletHosts.getServletHosts();
+        ServletHost host = TuscanyServletFilter.getServletHost();
+        if (host != null) {
+            hosts.clear();
+            hosts.add(host);
+        }
+    }
+
+    public void stop(ExtensionPointRegistry registry) {
+    }
+
+}
diff --git a/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppRequestDispatcher.java b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppRequestDispatcher.java
new file mode 100644
index 0000000000..f14dfac58b
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppRequestDispatcher.java
@@ -0,0 +1,114 @@
+/*
+ * 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.webapp;
+
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+import javax.servlet.ServletException;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletRequestWrapper;
+
+/**
+ * A Servlet request dispatcher that can be used to delegate requests to a
+ * Servlet registered with the Webapp Servlet host.
+ *
+ * @version $Rev$ $Date$
+ */
+class WebAppRequestDispatcher implements RequestDispatcher {
+    private String servletPath;
+    private Servlet servlet;
+    
+    public WebAppRequestDispatcher(String mapping, Servlet servlet) {
+        if (mapping.endsWith("*")) {
+            mapping = mapping.substring(0, mapping.length()-1);
+        }
+        if (mapping.endsWith("/")) {
+            mapping = mapping.substring(0, mapping.length()-1);
+        }
+        this.servletPath = mapping;
+        this.servlet = servlet;
+    }
+
+    /**
+     * Returns a request wrapper which will return the correct Servlet path
+     * and path info.
+     * 
+     * @param request
+     * @return
+     */
+    private HttpServletRequest createRequestWrapper(ServletRequest request) {
+        HttpServletRequest requestWrapper = new HttpServletRequestWrapper((HttpServletRequest)request) {
+            
+            @Override
+            public String getServletPath() {
+                return servletPath;
+            }
+            
+            @Override
+            public String getPathInfo() {
+                String path = super.getServletPath();
+                if (path.length() == 0) {
+                    path = super.getPathInfo();
+                }
+
+                // TODO: another context path hack, revisit when context path is sorted out
+                path = fiddlePath(path, servletPath);
+
+                return path;
+            }
+        };
+        return requestWrapper;
+    }
+
+    /**
+     * Remove any path suffix thats part of the Servlet context path
+     */
+    protected String fiddlePath(String path, String servletPath) {
+        StringTokenizer st = new StringTokenizer(path, "/");
+        if (st.countTokens() == 1) {
+            return path;
+        }
+        String root = "";
+        while (st.hasMoreTokens()){
+                String s = st.nextToken();
+                if (servletPath.endsWith((root + "/" + s))) {
+                        root += "/" + s;
+                } else {
+                        break;
+                }
+        }
+        String fiddlePath = path.substring(root.length());
+        return fiddlePath;
+    }
+
+    public void forward(ServletRequest request, ServletResponse response) throws ServletException, IOException {
+        servlet.service(createRequestWrapper(request), response);
+    }
+    
+    public void include(ServletRequest request, ServletResponse response) throws ServletException, IOException {
+        servlet.service(createRequestWrapper(request), response);
+    }
+}
+
diff --git a/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppServletHost.java b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppServletHost.java
new file mode 100644
index 0000000000..729810b0fb
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/WebAppServletHost.java
@@ -0,0 +1,336 @@
+/*
+ * 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.webapp;
+
+import java.io.File;
+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.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Logger;
+
+import javax.naming.InitialContext;
+import javax.naming.NamingException;
+import javax.servlet.RequestDispatcher;
+import javax.servlet.Servlet;
+import javax.servlet.ServletConfig;
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+
+import org.apache.tuscany.sca.host.http.ServletHost;
+import org.apache.tuscany.sca.host.http.ServletMappingException;
+import org.apache.tuscany.sca.node.Contribution;
+import org.apache.tuscany.sca.node.Node;
+import org.apache.tuscany.sca.node.NodeFactory;
+
+/**
+ * ServletHost implementation for use in a webapp environment.
+ * 
+ * FIXME: using a static singleton seems a big hack but how should it be shared?
+ * Need some way for TuscanyServlet to pull it out.
+ *
+ * @version $Rev$ $Date$
+ */
+public class WebAppServletHost implements ServletHost {
+    private static final Logger logger = Logger.getLogger(WebAppServletHost.class.getName());
+
+    public static final String SCA_NODE_ATTRIBUTE = Node.class.getName();
+
+    private static final WebAppServletHost instance = new WebAppServletHost();
+
+    private Map<String, Servlet> servlets;
+    private Node node;
+    private String contextPath = "/";
+    private int defaultPortNumber = 8080;
+    private String contributionRoot;
+
+    private ServletContext servletContext;
+
+    WebAppServletHost() {
+        servlets = new HashMap<String, Servlet>();
+    }
+
+    public void setDefaultPort(int port) {
+        defaultPortNumber = port;
+    }
+
+    public int getDefaultPort() {
+        return defaultPortNumber;
+    }
+
+    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 = defaultPortNumber;
+        }
+
+        // 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 WebAppRequestDispatcher(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)) {
+                    // entry key is contextPath/servletPath, WebAppRequestDispatcher only wants servletPath
+                    return new WebAppRequestDispatcher(entry.getKey().substring(contextPath.length()), entry.getValue());
+                } else {
+                    if ((suri + "/").startsWith(servletPath)) {
+                        return new WebAppRequestDispatcher(entry.getKey().substring(contextPath.length()), entry.getValue());
+                    }
+                }
+            }
+        }
+
+        // No Servlet found
+        return null;
+    }
+
+    public static WebAppServletHost getInstance() {
+        return instance;
+    }
+
+    public void init(ServletConfig config) throws ServletException {
+
+        servletContext = config.getServletContext();
+        if (servletContext.getAttribute(SCA_NODE_ATTRIBUTE) == null) {
+            initContextPath(config);
+            contributionRoot = getContributionRoot(servletContext);
+            NodeFactory factory = NodeFactory.newInstance();
+            node = factory.createNode(null, new Contribution(contributionRoot, contributionRoot));
+            node.start();
+            servletContext.setAttribute(SCA_NODE_ATTRIBUTE, node);
+        }
+
+        // Initialize the registered Servlets
+        for (Servlet servlet : servlets.values()) {
+            servlet.init(config);
+        }
+        
+    }
+
+    protected String getContributionRoot(ServletContext servletContext) {
+        String contributionRoot = null;
+        try {
+
+            InitialContext ic = new InitialContext();
+            URL repoURL = (URL)ic.lookup("java:comp/env/url/contributions");
+
+            contributionRoot = repoURL.toString();
+
+        } catch (NamingException e) {
+
+            // ignore exception and use default location
+
+            try {
+                
+                String root = servletContext.getInitParameter("contributionRoot");
+                if (root == null || root.length() < 1) {
+                    root = "/";
+                }
+                URL rootURL = servletContext.getResource(root);
+                if (rootURL.getProtocol().equals("jndi")) {
+                    //this is Tomcat case, we should use getRealPath
+                    File warRootFile = new File(servletContext.getRealPath(root));
+                    contributionRoot = warRootFile.toURI().toString();
+                } else {
+                    //this is Jetty case
+                    contributionRoot = rootURL.toString();
+                }
+
+            } catch (MalformedURLException mf) {
+                //ignore, pass null
+            }
+        }
+
+        return contributionRoot;
+    }
+
+    /**
+     * Initializes the contextPath
+     * The 2.5 Servlet API has a getter for this, for pre 2.5 Servlet
+     * containers use an init parameter.
+     */
+    @SuppressWarnings("unchecked")
+    public void initContextPath(ServletConfig config) {
+        
+        if (Collections.list(config.getInitParameterNames()).contains("contextPath")) {
+            contextPath = config.getInitParameter("contextPath");
+        } else {
+            // The getContextPath() is introduced since Servlet 2.5
+            ServletContext context = config.getServletContext();
+            try {
+                // Try to get the method anyway since some ServletContext impl has this method even before 2.5
+                Method m = context.getClass().getMethod("getContextPath", new Class[] {});
+                contextPath = (String)m.invoke(context, new Object[] {});
+            } catch (Exception e) {
+                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);
+    }
+
+    void destroy() {
+
+        // Destroy the registered Servlets
+        for (Servlet servlet : servlets.values()) {
+            servlet.destroy();
+        }
+
+        // Close the SCA domain
+        if (node != null) {
+            node.stop();
+        }
+    }
+
+    public String getContextPath() {
+        return contextPath;
+    }
+
+    public void setContextPath(String path) {
+        //        if (!contextPath.equals(path)) {
+        //            throw new IllegalArgumentException("invalid context path for webapp, existing context path: " + contextPath + " new contextPath: " + path);
+        //        }
+    }
+
+    /**
+     * TODO: How context paths work is still up in the air so for now
+     *    this hacks in a path that gets some samples working
+     *    can't use setContextPath as NodeImpl calls that later
+     */
+    public void setContextPath2(String path) {
+        if (path != null && path.length() > 0) {
+            this.contextPath = path;
+        }
+    }
+
+    public String getContributionRoot() {
+        return contributionRoot;
+    }
+
+    public void setAttribute(String name, Object value) {
+        servletContext.setAttribute(name, value);
+    }
+}
diff --git a/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/jsp/ReferenceTEI.java b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/jsp/ReferenceTEI.java
new file mode 100644
index 0000000000..6e1b187a48
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/jsp/ReferenceTEI.java
@@ -0,0 +1,45 @@
+/*
+ * 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.webapp.jsp;
+
+import javax.servlet.jsp.tagext.TagData;
+import javax.servlet.jsp.tagext.TagExtraInfo;
+import javax.servlet.jsp.tagext.VariableInfo;
+
+/**
+ * TagExtraInfo class for the SCA reference tags
+ * <sca:reference name="service" type="test.MyService" scope="1" />
+ *
+ * @version $Rev$ $Date$
+ */
+public class ReferenceTEI extends TagExtraInfo {
+
+    @Override
+    public VariableInfo[] getVariableInfo(TagData data) {
+        VariableInfo info1
+           = new VariableInfo(
+              data.getAttributeString("name"),
+              data.getAttributeString("type"),
+              true,
+              VariableInfo.AT_END);
+        VariableInfo[] info = { info1 } ;
+        return info;
+     }
+}
diff --git a/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/jsp/ReferenceTag.java b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/jsp/ReferenceTag.java
new file mode 100644
index 0000000000..704f45b706
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/java/org/apache/tuscany/sca/host/webapp/jsp/ReferenceTag.java
@@ -0,0 +1,118 @@
+/*
+ * 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.webapp.jsp;
+
+import javax.servlet.ServletContext;
+import javax.servlet.ServletException;
+import javax.servlet.jsp.JspException;
+import javax.servlet.jsp.PageContext;
+import javax.servlet.jsp.tagext.TagSupport;
+
+import org.apache.tuscany.sca.host.webapp.WebAppServletHost;
+import org.apache.tuscany.sca.node.Node;
+import org.osoa.sca.ComponentContext;
+
+/**
+ * Tag to handle SCA references
+ * <sca:reference name="service" type="test.MyService" scope="1" />
+ *
+ * @version $Rev$ $Date$
+ */
+public class ReferenceTag extends TagSupport {
+    private static final long serialVersionUID = 1L;
+
+    protected String name;
+    protected String type;
+    protected Integer scope = PageContext.PAGE_SCOPE;
+
+    @Override
+    public int doStartTag() throws JspException {
+        return SKIP_BODY;
+    }
+
+    @Override
+    public int doEndTag() throws JspException {
+
+        try {
+            WebAppServletHost.getInstance().init(pageContext.getServletConfig());
+        } catch (ServletException e) {
+            throw new JspException("Exception initializing Tuscany webapp: " + e, e);
+        }
+ 
+        ServletContext servletContext = pageContext.getServletContext();
+        ComponentContext componentContext = (ComponentContext)servletContext.getAttribute("org.osoa.sca.ComponentContext");
+        Node scaDomain = null;
+        if (componentContext == null) {
+            scaDomain = (Node)servletContext.getAttribute(WebAppServletHost.SCA_NODE_ATTRIBUTE);
+            if (scaDomain == null) {
+                throw new JspException("SCADomain is null. Check Tuscany configuration in web.xml");
+            }
+        }
+
+        Class<?> typeClass;
+        try {
+            typeClass = Class.forName(type, true, Thread.currentThread().getContextClassLoader());
+        } catch (ClassNotFoundException e) {
+            throw new JspException("Reference '" + name + "' type class not found: " + type);
+        }
+
+        Object o;
+        try {
+            if (componentContext != null) {
+                o = componentContext.getService(typeClass, name);
+            } else {
+                o = scaDomain.getService(typeClass, name);
+            }
+        } catch (Exception e) {
+            throw new JspException("Exception getting service for reference'" + name + "': " + e, e);
+        }
+        if (o == null) {
+            throw new JspException("Reference '" + name + "' not found");
+        }
+
+        pageContext.setAttribute(name, o, scope);
+
+        return EVAL_PAGE;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Integer getScope() {
+        return scope;
+    }
+
+    public void setScope(Integer scope) {
+        this.scope = scope;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+}
diff --git a/java/sca/modules/host-webapp/src/main/resources/META-INF/sca.tld b/java/sca/modules/host-webapp/src/main/resources/META-INF/sca.tld
new file mode 100644
index 0000000000..089cdc1607
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/resources/META-INF/sca.tld
@@ -0,0 +1,62 @@
+<?xml version = '1.0' encoding = 'ISO-8859-1'?>

+<!--

+ * 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.    

+ -->

+

+<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd">

+

+<taglib version="2.1">

+

+  <tlib-version>1.0</tlib-version>

+  <short-name>SCA-JSP</short-name>

+  <uri>http://www.osoa.org/sca/sca_jsp.tld</uri>

+  <description>A tag library for integrating sca components with jsp</description>

+

+  <tag>

+

+    <name>reference</name>

+

+    <tag-class>org.apache.tuscany.sca.host.webapp.jsp.ReferenceTag</tag-class>

+    <tei-class>org.apache.tuscany.sca.host.webapp.jsp.ReferenceTEI</tei-class>

+    

+    <attribute>

+      <name>name</name>

+      <required>true</required>

+      <rtexprvalue>false</rtexprvalue>

+      <type>java.lang.String</type>

+    </attribute>

+

+    <attribute>

+      <name>type</name>

+      <required>true</required>

+      <rtexprvalue>false</rtexprvalue>

+      <type>java.lang.String</type>

+    </attribute>

+

+    <attribute>

+      <name>scope</name>

+      <required>false</required>

+      <rtexprvalue>false</rtexprvalue>

+      <type>java.lang.Integer</type>

+    </attribute>

+

+    <body-content>empty</body-content>

+

+  </tag>

+

+</taglib>

diff --git a/java/sca/modules/host-webapp/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivator b/java/sca/modules/host-webapp/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivator
new file mode 100644
index 0000000000..d99fdf257e
--- /dev/null
+++ b/java/sca/modules/host-webapp/src/main/resources/META-INF/services/org.apache.tuscany.sca.core.ModuleActivator
@@ -0,0 +1,18 @@
+# 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.

+# Implementation class for the ModuleActivator

+org.apache.tuscany.sca.host.webapp.WebAppModuleActivator