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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();
}
}
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