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+/*
+ * 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.binding.jsonrpc;
+
+import java.net.URI;
+
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.core.invocation.JDKProxyFactory;
+import org.apache.tuscany.sca.core.invocation.ProxyFactory;
+import org.apache.tuscany.sca.extension.helper.ComponentLifecycle;
+import org.apache.tuscany.sca.host.http.ServletHost;
+import org.apache.tuscany.sca.interfacedef.Interface;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+import org.apache.tuscany.sca.runtime.RuntimeComponent;
+import org.apache.tuscany.sca.runtime.RuntimeComponentService;
+
+/**
+ * Implementation of the JSONRPC binding provider.
+ *
+ * There are multiple servlets used to support the JSON-RPC binidng.
+ * One servlet to handle requests for the scaDomain script and seperate
+ * servlets for each SCA <service> which uses <binding.jsonrpc>.
+ */
+public class JSONRPCService implements ComponentLifecycle {
+
+ private RuntimeComponentService service;
+ private ServletHost servletHost;
+ private Binding binding;
+
+ public static final String SERVICE_PREFIX = "/SCADomain/";
+
+ // path to the scaDomain.js script
+ // Note: this is the same as the Ajax binding to keep the client code
+ // the same for clients using either the ajax or jsonrpc binding
+ public static final String SCA_DOMAIN_SCRIPT = SERVICE_PREFIX + "scaDomain.js";
+
+
+ public JSONRPCService(RuntimeComponent component,
+ RuntimeComponentService service,
+ Binding b,
+ JSONRPCBinding binding,
+ ServletHost servletHost) {
+ this.service = service;
+ this.binding = b;
+ this.servletHost = servletHost;
+ }
+
+ public void start() {
+
+ // Determine the service business interface
+ Class<?> serviceInterface = getTargetJavaClass(service.getInterfaceContract().getInterface());
+
+ // Create a Java proxy to the target service
+ ProxyFactory proxyFactory = new JDKProxyFactory();
+ Object proxy = proxyFactory.createProxy(serviceInterface, service.getRuntimeWire(binding));
+
+ // Create and register a servlet for this service
+ JSONRPCServiceServlet serviceServlet = new JSONRPCServiceServlet(binding.getName(), serviceInterface, proxy);
+ int port;
+ servletHost.addServletMapping(binding.getURI(), serviceServlet);
+ URI uri = URI.create(binding.getURI());
+ port = uri.getPort();
+ if (port == -1)
+ port = 8080;
+
+ // get the ScaDomainScriptServlet, if it doesn't yet exist create one
+ // this uses removeServletMapping / addServletMapping as theres no getServletMapping facility
+ URI domainURI = URI.create("http://localhost:" + port + SCA_DOMAIN_SCRIPT);
+ ScaDomainScriptServlet scaDomainServlet = (ScaDomainScriptServlet) servletHost.getServletMapping(domainURI.toString());
+ if (scaDomainServlet == null) {
+ scaDomainServlet = new ScaDomainScriptServlet();
+ servletHost.addServletMapping(domainURI.toString(), scaDomainServlet);
+ }
+
+ // Add this service to the scadomain script servlet
+ scaDomainServlet.addService(binding.getName());
+
+ }
+
+ public void stop() {
+
+ // Unregister from the service servlet mapping
+ int port;
+ servletHost.removeServletMapping(binding.getURI());
+ URI uri = URI.create(binding.getURI());
+ port = uri.getPort();
+ if (port == -1)
+ port = 8080;
+
+ // Unregister the service from the scaDomain script servlet
+ URI domainURI = URI.create("http://localhost:" + port + SCA_DOMAIN_SCRIPT);
+ ScaDomainScriptServlet scaDomainServlet = (ScaDomainScriptServlet) servletHost.getServletMapping(domainURI.toString());
+ if (scaDomainServlet != null) {
+ scaDomainServlet.removeService(binding.getName());
+
+ // Remove the servlet if there's no more registered services
+ if (scaDomainServlet.getServiceNames().isEmpty()) {
+ servletHost.removeServletMapping(domainURI.toString());
+ }
+ }
+ }
+
+ protected Class<?> getTargetJavaClass(Interface targetInterface) {
+ // TODO: right now assume that the target is always a Java
+ // Implementation. Need to figure out how to generate Java
+ // Interface in cases where the target is not a Java Implementation
+ return ((JavaInterface)targetInterface).getJavaClass();
+ }
+
+}