diff options
Diffstat (limited to 'branches/sca-java-2.0-M4/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientServlet.java')
-rw-r--r-- | branches/sca-java-2.0-M4/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientServlet.java | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/branches/sca-java-2.0-M4/modules/implementation-web-client/src/main/java/org/apache/tuscany/sca/implementation/web/client/ClientServlet.java b/branches/sca-java-2.0-M4/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/branches/sca-java-2.0-M4/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;
+ }
+
+}
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