Add a new module for the implementaion.web client side support which enables browser-side JavaScript to access the web components ComponentContext and being able to invoke references

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@829752 13f79535-47bb-0310-9956-ffa450edef68

8 files changed, 749 insertions, 0 deletions

diff --git a/java/sca/modules/implementation-web-client/LICENSE b/java/sca/modules/implementation-web-client/LICENSE
new file mode 100644
index 0000000000..fa1256bf99
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/LICENSE
@@ -0,0 +1,241 @@
+

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+      any Contribution intentionally submitted for inclusion in the Work

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+      the terms of any separate license agreement you may have executed

+      with Licensor regarding such Contributions.

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+      To apply the Apache License to your work, attach the following

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+   Copyright [yyyy] [name of copyright owner]

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+   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

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+       http://www.apache.org/licenses/LICENSE-2.0

+

+   Unless required by applicable law or agreed to in writing, software

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+===============================================================================

+

+Apache Tuscany SCA for Java Subcomponents

+=========================================: 

+

+The Tuscany SCA for Java release includes a number of subcomponents with

+separate copyright notices and license terms. Your use of the source

+code for the these subcomponents is subject to the terms and

+conditions of the following licenses.

+

+===============================================================================

+This module includes files under the following license:

+

+Permission to copy, display and distribute the Service Component Architecture Specification and/or

+portions thereof, without modification, in any medium without fee or royalty is hereby granted, provided

+that you include the following on ALL copies of the Service Component Architecture Specification, or

+portions thereof, that you make:

+

+1. A link or URL to the Service Component Architecture Specification at this location:

+· http://www.osoa.org/display/Main/Service+Component+Architecture+Specifications

+

+2. The full text of the copyright notice as shown in the Service Component Architecture Specification.

+

+BEA, Cape Clear, IBM, Interface21, IONA, Oracle, Primeton, Progress Software, Red Hat, Rogue Wave,

+SAP, Siemens, Software AG., Sun, Sybase, TIBCO (collectively, the "Authors") agree to grant you a

+royalty-free license, under reasonable, non-discriminatory terms and conditions to patents that they deem

+necessary to implement the Service Component Architecture Specification.

+THE Service Component Architecture SPECIFICATION IS PROVIDED "AS IS," AND THE

+AUTHORS MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED,

+REGARDING THIS SPECIFICATION AND THE IMPLEMENTATION OF ITS CONTENTS,

+INCLUDING, BUT NOT LIMITED TO, WARRANTIES OF MERCHANTABILITY, FITNESS FOR A

+PARTICULAR PURPOSE, NON-INFRINGEMENT OR TITLE.

+THE AUTHORS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL

+OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR RELATING TO ANY USE OR

+DISTRIBUTION OF THE Service Components Architecture SPECIFICATION.

+The name and trademarks of the Authors may NOT be used in any manner, including advertising or

+publicity pertaining to the Service Component Architecture Specification or its contents without specific,

+

diff --git a/java/sca/modules/implementation-web-client/META-INF/MANIFEST.MF b/java/sca/modules/implementation-web-client/META-INF/MANIFEST.MF
new file mode 100644
index 0000000000..abfed62f09
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/META-INF/MANIFEST.MF
@@ -0,0 +1,29 @@
+Manifest-Version: 1.0

+Export-Package: org.apache.tuscany.sca.implementation.web.runtime.utils;ver

+ sion="2.0"

+Tool: Bnd-0.0.255

+Bundle-Name: Apache Tuscany SCA Web Implementation Web Runtime

+Created-By: 1.6.0_07 (Sun Microsystems Inc.)

+Bundle-Vendor: The Apache Software Foundation

+Bundle-Version: 2.0.0

+Bnd-LastModified: 1225397153500

+Bundle-ManifestVersion: 2

+Bundle-License: http://www.apache.org/licenses/LICENSE-2.0.txt

+Bundle-Description: Apache Tuscany SCA Implementation Web Runtime

+Bundle-SymbolicName: org.apache.tuscany.sca.implementation.web.runtime

+Bundle-DocURL: http://www.apache.org/

+Import-Package: javax.servlet,

+ javax.servlet.jsp,

+ javax.servlet.jsp.tagext,

+ org.apache.tuscany.sca.assembly;version="2.0.0",

+ org.apache.tuscany.sca.core;version="2.0.0",

+ org.apache.tuscany.sca.host.http;version="2.0.0",

+ org.apache.tuscany.sca.implementation.web;version="2.0.0",

+ org.apache.tuscany.sca.interfacedef;version="2.0.0",

+ org.apache.tuscany.sca.invocation;version="2.0.0",

+ org.apache.tuscany.sca.policy;version="2.0.0",

+ org.apache.tuscany.sca.provider;version="2.0.0",

+ org.apache.tuscany.sca.runtime;version="2.0.0",

+ org.oasisopen.sca.annotation;version="2.0.0",

+ org.oasisopen.sca;version="2.0.0"

+Bundle-RequiredExecutionEnvironment: J2SE-1.5,JavaSE-1.6
diff --git a/java/sca/modules/implementation-web-client/NOTICE b/java/sca/modules/implementation-web-client/NOTICE
new file mode 100644
index 0000000000..e158926510
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/NOTICE
@@ -0,0 +1,12 @@
+${pom.name}

+Copyright (c) 2005 - 2009 The Apache Software Foundation

+

+This product includes software developed by

+The Apache Software Foundation (http://www.apache.org/).

+

+This product also includes software under the Service Component Architecture specification license

+(see the LICENSE file contained in this distribution) with the following copyright

+

+(c) Copyright BEA Systems, Inc., Cape Clear Software, International Business Machines Corp, Interface21, IONA

+Technologies, Oracle, Primeton Technologies, Progress Software, Red Hat, Rogue Wave Software, SAP AG., Siemens

+AG., Software AG., Sun Microsystems, Inc., Sybase Inc., TIBCO Software Inc., 2005, 2008. All rights reserved.

diff --git a/java/sca/modules/implementation-web-client/pom.xml b/java/sca/modules/implementation-web-client/pom.xml
new file mode 100644
index 0000000000..1fdb8a5cda
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/pom.xml
@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="UTF-8"?>

+<!--

+ * 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.

+-->

+<project>

+    <modelVersion>4.0.0</modelVersion>

+    <parent>

+        <groupId>org.apache.tuscany.sca</groupId>

+        <artifactId>tuscany-modules</artifactId>

+        <version>2.0-SNAPSHOT</version>

+        <relativePath>../pom.xml</relativePath>

+    </parent>

+

+    <artifactId>tuscany-implementation-web-client</artifactId>

+    <name>Apache Tuscany SCA Web Implementation Client</name>

+

+    <dependencies>

+

+        <dependency>

+            <groupId>org.apache.tuscany.sca</groupId>

+            <artifactId>tuscany-implementation-web-runtime</artifactId>

+            <version>2.0-SNAPSHOT</version>

+        </dependency>

+

+        <dependency>

+            <groupId>org.directwebremoting</groupId>

+            <artifactId>dwr</artifactId>

+            <version>2.0.3</version>

+        </dependency>

+

+        <dependency>

+            <groupId>commons-logging</groupId>

+            <artifactId>commons-logging</artifactId>

+            <version>1.1.1</version>

+        </dependency>

+

+        <dependency>

+            <groupId>javax.servlet</groupId>

+            <artifactId>servlet-api</artifactId>

+            <version>2.5</version>

+            <scope>provided</scope>

+        </dependency>

+

+        <dependency>

+            <groupId>junit</groupId>

+            <artifactId>junit</artifactId>

+            <version>4.5</version>

+            <scope>test</scope>

+        </dependency>

+

+    </dependencies>

+

+</project>

diff --git a/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientImplementationProvider.java b/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientImplementationProvider.java
new file mode 100644
index 0000000000..f688e103cd
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientImplementationProvider.java
@@ -0,0 +1,43 @@
+/*

+ * 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.web.client;

+

+import org.apache.tuscany.sca.interfacedef.Operation;

+import org.apache.tuscany.sca.invocation.Invoker;

+import org.apache.tuscany.sca.provider.ImplementationProvider;

+import org.apache.tuscany.sca.runtime.RuntimeComponentService;

+

+public class ClientImplementationProvider implements ImplementationProvider {

+

+    public Invoker createInvoker(RuntimeComponentService arg0, Operation arg1) {

+        return null;

+    }

+

+    public void start() {

+    }

+

+    public void stop() {

+    }

+

+    public boolean supportsOneWayInvocation() {

+        return false;

+    }

+

+}

diff --git a/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientProviderFactory.java b/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientProviderFactory.java
new file mode 100644
index 0000000000..efddb002c1
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientProviderFactory.java
@@ -0,0 +1,62 @@
+/*

+ * 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.web.client;

+

+import java.util.List;

+

+import org.apache.tuscany.sca.assembly.ComponentReference;

+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.implementation.web.WebImplementation;

+import org.apache.tuscany.sca.implementation.web.runtime.WebImplementationProviderFactory;

+import org.apache.tuscany.sca.provider.ImplementationProvider;

+import org.apache.tuscany.sca.runtime.RuntimeComponent;

+

+public class ClientProviderFactory extends WebImplementationProviderFactory {

+

+    private ServletHost servletHost;

+

+    public ClientProviderFactory(ExtensionPointRegistry extensionPoints) {

+        super(extensionPoints);

+        ServletHostExtensionPoint servletHosts = extensionPoints.getExtensionPoint(ServletHostExtensionPoint.class);

+        List<ServletHost> hosts = servletHosts.getServletHosts();

+        if (!hosts.isEmpty()) {

+            this.servletHost = hosts.get(0);

+        }

+    }

+

+    public ImplementationProvider createImplementationProvider(RuntimeComponent component, WebImplementation implementation) {

+

+        ClientServlet clientServlet = new ClientServlet();

+        servletHost.addServletMapping(ClientServlet.SCRIPT_PATH, clientServlet);

+        servletHost.addServletMapping(ClientServlet.SCRIPT_PATH + "/" + component.getName() + "/*", clientServlet);

+

+        if (component.getReferences().size() > 0) {

+            for (ComponentReference cr : component.getReferences()) {

+                clientServlet.addService(cr, component);

+            }

+        }

+

+        servletHost.setAttribute("org.apache.tuscany.sca.implementation.web.RuntimeComponent", component);

+

+        return new ClientImplementationProvider();

+    }

+

+}

diff --git a/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientServlet.java b/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientServlet.java
new file mode 100644
index 0000000000..0917804d65
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientServlet.java
@@ -0,0 +1,273 @@
+/*

+ * 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.web.client;

+

+import java.io.IOException;

+import java.io.PrintWriter;

+import java.util.Arrays;

+import java.util.Collection;

+import java.util.Collections;

+import java.util.Enumeration;

+import java.util.HashMap;

+import java.util.Map;

+

+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 javax.servlet.http.HttpServletResponse;

+

+import org.apache.tuscany.sca.assembly.ComponentReference;

+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;

+import org.apache.tuscany.sca.runtime.RuntimeComponent;

+import org.directwebremoting.Container;

+import org.directwebremoting.create.AbstractCreator;

+import org.directwebremoting.extend.CreatorManager;

+import org.directwebremoting.extend.Handler;

+import org.directwebremoting.extend.Remoter;

+import org.directwebremoting.servlet.DwrServlet;

+import org.directwebremoting.servlet.EngineHandler;

+import org.directwebremoting.servlet.PathConstants;

+import org.directwebremoting.servlet.UrlProcessor;

+

+/**

+ * Tuscany customized DWR Servlet to implement support for the DWR binding

+ * 

+ * Handles requests for SCA services and references that use <binding.dwr>

+ */

+public class ClientServlet extends DwrServlet {

+    private static final long serialVersionUID = 1L;

+

+    private transient Map<String, ServiceHolder> services;

+//    private transient List<String> referenceNames;

+    private transient boolean initialized;

+    private transient Map<String, String> initParams;

+

+    public static final String SCRIPT_PATH = "/org.oasisopen.sca.componentContext.js";

+

+    public ClientServlet() {

+        this.services = new HashMap<String, ServiceHolder>();

+//        this.referenceNames = new ArrayList<String>();

+

+        this.initParams = new HashMap<String, String>();

+        // maybe use <binding.dwr> attributes to define the init params

+        initParams.put("activeReverseAjaxEnabled", "true");

+    }

+

+    @Override

+    public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException {

+        super.service(req, res);

+    }

+

+    /**

+     * Initialize the Servlet

+     * There is a single instance of this Servlet which is registered

+     * for multiple path mappings, but the init should only run once.

+     */

+    @Override

+    public void init(ServletConfig servletConfig) throws ServletException {

+        if (!initialized) {

+            super.init(patchConfig(servletConfig));

+            addScriptHandler();

+            initServices();

+            initialized = true;

+        }

+    }

+

+    /**

+     * Add in the handler to process the HTTP get for /sca/scaDomain.js

+     * 

+     * This wrappers the DWR Engine handler which returns the DWR engine.js script,

+     * this wrappers that handler so as to add Tuscany specific header and footer code

+     * to the DWR engine.js to define the Tuscany SCADomain control functions and

+     * functions for each SCA service and reference that use <binding.dwr>.

+     */

+    private void addScriptHandler() {

+

+        UrlProcessor urlProcessor = (UrlProcessor)getContainer().getBean(UrlProcessor.class.getName());

+

+        final EngineHandler engineHandler =

+            (EngineHandler)getContainer().getBean(PathConstants.URL_PREFIX + "/engine.js");

+

+        final Handler scaDomainScriptHandler = new Handler() {

+            public void handle(HttpServletRequest request, HttpServletResponse response) throws IOException {

+                PrintWriter out = response.getWriter();

+                out.println("/** Apache Tuscany componentContext.js Header */");

+

+                engineHandler.handle(request, response);

+

+                tuscanyFooter(request, out);

+            }

+

+        };

+

+        // add the scaDomainScriptHandler to the urlProcessor

+        // bit of a hack, there's probably cleaner way to get it registered

+        urlProcessor.afterContainerSetup(new Container() {

+            public Object getBean(String name) {

+                return scaDomainScriptHandler;

+            }

+            public Collection<?> getBeanNames() {

+                return Arrays.asList(new String[] {PathConstants.URL_PREFIX + SCRIPT_PATH});

+            }

+        });

+    }

+

+    /**

+     * Adds the JavaScript defining SCADomain, its control functions,

+     * and functions for all the available SCA services and references.

+     */

+    private void tuscanyFooter(HttpServletRequest request, PrintWriter out) {

+        out.println("if (SCA == undefined) var SCA = new Object();");

+        out.println("if (SCA.componentContext == undefined) {");

+        out.println("   SCA.componentContext = new Object();");

+        out.println("   SCA.componentContext.serviceNames = [];");

+        out.println("   SCA.componentContext.serviceProxys = [];");

+        out.println("   SCA.componentContext.getService = function(serviceName){");

+        out.println("      var i = SCA.componentContext.serviceNames.indexOf(serviceName);");

+        out.println("      return SCA.componentContext.serviceProxys[i];");

+        out.println("   };");

+        out.println("   if (componentContext == undefined) var componentContext = SCA.componentContext;");

+        out.println("}");

+

+//        out.println("/** Apache Tuscany scaDomain.js Footer */");

+//        out.println();

+//        out.println("function scaDomain() { }");

+//        out.println();

+//        out.println("// SCA services");

+

+        // Use the DWR remoter to generate the JavaScipt function for each SCA service        

+        Remoter remoter = (Remoter)getContainer().getBean(Remoter.class.getName());

+

+

+        for (String serviceName : services.keySet()) {

+            String path = request.getServletPath() + "/" + services.get(serviceName).c.getName();

+            String serviceScript = remoter.generateInterfaceScript(serviceName, path);

+            out.println(serviceScript);

+            out.println("SCA.componentContext.serviceNames.push('" + serviceName + "');");

+            out.println("SCA.componentContext.serviceProxys.push(" + serviceName + ");");

+//            ServiceHolder s = services.get(serviceName);

+//            final Class<?> iface = ((JavaInterface)s.cr.getInterfaceContract().getInterface()).getJavaClass();

+//            for (Method m : iface.getMethods()) {

+//                out.println("if (" + serviceName + " == null) var " + serviceName + " = {};");

+//                out.println("SCA.componentContext.serviceNames.push('" + serviceName + "');");

+////                out.println("SCA.componentContext.serviceProxys.push(new JSONRpcClient('" + serviceName + "').Service);");

+//                out.println(serviceName + "." + m.getName() + " = function(p0, callback) {");

+//                out.println("    dwr.engine._execute(" + serviceName + "._path, '" + serviceName + "', '" + m.getName() + "', p0, callback);");

+//                out.println("  }");

+//            }

+        }

+        

+//        if (referenceNames.size() > 0) {

+//

+//            out.println("// SCA reverse ajax control functions");

+//            out.println();

+//            out.println("scaDomain.open = function() { dwr.engine.setActiveReverseAjax(true); };");

+//            out.println("scaDomain.close = function() { dwr.engine.setActiveReverseAjax(false); };");

+//

+//            out.println();

+//            out.println("// SCA references");

+//            out.println();

+//           

+//            // the JavaScript function for SCA references has an 

+//            // empty impl as it uses DWR severside "push" 

+//            for (String referenceName : referenceNames) {

+//                out.println("function " + referenceName + "() { }");

+//            }

+//        }

+

+        out.println();

+        out.println("/** End of Apache Tuscany componentContext.js */");

+        out.println();

+    }

+

+//    /**

+//     * Add an SCA reference to be added to the DWR runtime 

+//     */

+//    public void addReference(String name) {

+//        referenceNames.add(name);

+//    }

+

+    /**

+     * Add an SCA service to be added to the DWR runtime

+     */

+    public void addService(ComponentReference cr, RuntimeComponent c) {

+        ServiceHolder holder = new ServiceHolder();

+        holder.name = cr.getName();

+        holder.cr = cr;

+        holder.c = c;

+        services.put(cr.getName(), holder);

+    }

+

+    /**

+     * Defines each SCA service proxy instance to DWR 

+     */

+    private void initServices() {

+        CreatorManager creatorManager = (CreatorManager)getContainer().getBean(CreatorManager.class.getName());

+

+        for (final ServiceHolder service : services.values()) {

+

+            final Class<?> iface = ((JavaInterface)service.cr.getInterfaceContract().getInterface()).getJavaClass();

+            final Object instance = service.c.getComponentContext().getServiceReference(iface, service.cr.getName()).getService();

+            

+            creatorManager.addCreator(service.cr.getName(), new AbstractCreator() {

+                public Class<?> getType() {

+                    return iface;

+                }

+

+                public Object getInstance() throws InstantiationException {

+                    return instance;

+                }

+            });

+        }

+    }

+

+    // utility class to aid passing around services

+    private class ServiceHolder {

+        String name;

+        ComponentReference cr;

+        RuntimeComponent c;

+    }

+

+    /**

+     * Patch the ServletConfig to enable setting init params for DWR

+     * and so DWR can't see the Tuscany servlet's init params.

+     */

+    private ServletConfig patchConfig(final ServletConfig servletConfig) {

+        ServletConfig patchedContext = new ServletConfig() {

+            public String getInitParameter(String name) {

+                return initParams.get(name);

+            }

+            public Enumeration<?> getInitParameterNames() {

+                return Collections.enumeration(initParams.keySet());

+            }

+            public ServletContext getServletContext() {

+                return servletConfig.getServletContext();

+            }

+            public String getServletName() {

+                return servletConfig.getServletName();

+            }

+        };

+        return patchedContext;

+    }

+

+}

diff --git a/java/sca/modules/implementation-web-client/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory b/java/sca/modules/implementation-web-client/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory
new file mode 100644
index 0000000000..bef66366fe
--- /dev/null
+++ b/java/sca/modules/implementation-web-client/src/main/resources/META-INF/services/org.apache.tuscany.sca.provider.ImplementationProviderFactory
@@ -0,0 +1,21 @@
+# 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 implementation extension

+org.apache.tuscany.sca.implementation.web.client.ClientProviderFactory;model=org.apache.tuscany.sca.implementation.web.WebImplementation;ranking=1234

+

+