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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.provider;
import org.apache.tuscany.sca.binding.jsonrpc.JSONRPCBinding;
import org.apache.tuscany.sca.binding.jsonrpc.server.JSONRPCEntryPointServlet;
import org.apache.tuscany.sca.binding.jsonrpc.server.JSONRPCScriptServlet;
import org.apache.tuscany.sca.http.ServletHost;
import org.apache.tuscany.sca.interfacedef.Interface;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
import org.apache.tuscany.sca.provider.ServiceBindingProvider;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
/**
* Implementation of the JSONRPC binding provider.
*
* @version $Rev$ $Date$
*/
public class JSONRPCServiceBindingProvider implements ServiceBindingProvider {
private static int servletRegistrationCount = 0;
private RuntimeComponent component;
private RuntimeComponentService service;
private JSONRPCBinding binding;
private ServletHost servletHost;
// path to the JSONRPC javascript servlet
public static final String SCRIPT_GETTER_SERVICE_MAPPING = "/SCA/scripts";
public static final String JSONRPC_SERVICE_MAPPING_PREFIX = "/";
public JSONRPCServiceBindingProvider(RuntimeComponent component,
RuntimeComponentService service,
JSONRPCBinding binding,
ServletHost servletHost) {
this.component = component;
this.service = service;
this.binding = binding;
this.servletHost = servletHost;
}
public InterfaceContract getBindingInterfaceContract() {
return service.getInterfaceContract();
}
public void start() {
JSONRPCEntryPointServlet servlet;
Class<?> aClass = getTargetJavaClass(service.getInterfaceContract().getInterface());
Object instance = component.createSelfReference(aClass).getService();
servlet = new JSONRPCEntryPointServlet(binding.getName(), aClass, instance);
// register the servlet based on the service name
servletHost.addServletMapping(JSONRPC_SERVICE_MAPPING_PREFIX + binding.getName(), servlet);
// if the script getter servlet is not already registered then register
// it
if (servletRegistrationCount == 0) {
servletHost.addServletMapping(SCRIPT_GETTER_SERVICE_MAPPING, new JSONRPCScriptServlet());
}
// increase the registered servlet count
servletRegistrationCount++;
}
public void stop() {
// Unregister from the servlet mapping
servletHost.removeServletMapping(JSONRPC_SERVICE_MAPPING_PREFIX + binding.getName());
servletRegistrationCount--;
// if we unregistered the last JSONRPC servlet, then unreister the
// script servlet
if (servletRegistrationCount == 0) {
servletHost.removeServletMapping(SCRIPT_GETTER_SERVICE_MAPPING);
}
}
private 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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