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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 org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.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;
+import org.apache.tuscany.sca.spi.ComponentLifecycle;
+
+/**
+ * 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 RuntimeComponent component;
+ private RuntimeComponentService service;
+ private JSONRPCBinding jsonBinding;
+ 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.component = component;
+ this.service = service;
+ this.binding = b;
+ this.jsonBinding = binding;
+ this.servletHost = servletHost;
+ }
+
+ public void start() {
+
+ // Create and register a servlet for this service
+ Class<?> serviceInterface = getTargetJavaClass(service.getInterfaceContract().getInterface());
+ Object instance = component.createSelfReference(serviceInterface).getService();
+ JSONRPCServiceServlet serviceServlet = new JSONRPCServiceServlet(binding.getName(), serviceInterface, instance);
+ if (binding.getURI() != null) {
+ servletHost.addServletMapping(binding.getURI(), serviceServlet);
+ } else {
+ servletHost.addServletMapping(SERVICE_PREFIX + binding.getName(), serviceServlet);
+ }
+
+ // get the ScaDomainScriptServlet, if it doesn't yet exist create one
+ // this uses removeServletMapping / addServletMapping as theres no getServletMapping facility
+ ScaDomainScriptServlet scaDomainServlet = (ScaDomainScriptServlet) servletHost.removeServletMapping(SCA_DOMAIN_SCRIPT);
+ if (scaDomainServlet == null) {
+ scaDomainServlet = new ScaDomainScriptServlet();
+ }
+ servletHost.addServletMapping(SCA_DOMAIN_SCRIPT, scaDomainServlet);
+
+ // Add this service to the scadomain script servlet
+ scaDomainServlet.addService(binding.getName());
+
+ }
+
+ public void stop() {
+
+ // Unregister from the service servlet mapping
+ if (binding.getURI() != null) {
+ servletHost.removeServletMapping(binding.getURI());
+ } else {
+ servletHost.removeServletMapping(SERVICE_PREFIX + binding.getName());
+ }
+
+ // Unregister the service from the scaDomain script servlet
+ // don't unregister the scaDomain script servlet if it still has other service names
+ ScaDomainScriptServlet scaDomainServlet = (ScaDomainScriptServlet) servletHost.removeServletMapping(SCA_DOMAIN_SCRIPT);
+ if (scaDomainServlet != null) {
+ scaDomainServlet.removeService(binding.getName());
+ // put it back if there are still other services registered with the servlet
+ if (scaDomainServlet.getServiceNames().size() > 0) {
+ servletHost.addServletMapping(SCA_DOMAIN_SCRIPT, scaDomainServlet);
+ }
+ }
+ }
+
+ 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();
+ }
+
+}