/*
* 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.http.operationselector.jsonrpc.provider;
import java.io.CharArrayWriter;
import java.util.List;
import org.apache.tuscany.sca.binding.http.HTTPBinding;
import org.apache.tuscany.sca.binding.http.HTTPBindingContext;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Interceptor;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.MessageFactory;
import org.apache.tuscany.sca.runtime.RuntimeWire;
import org.json.JSONObject;
import com.metaparadigm.jsonrpc.JSONRPCResult;
/**
* JSON-RPC Operation Selector Interceptor
*
* @version $Rev: 776580 $ $Date: 2009-05-20 07:22:42 +0100 (Wed, 20 May 2009) $
*/
public class JSONRPCOperationSelectorInterceptor implements Interceptor {
private Invoker next;
private RuntimeWire runtimeWire;
private HTTPBinding binding;
private MessageFactory messageFactory;
public JSONRPCOperationSelectorInterceptor(HTTPBinding binding, RuntimeWire runtimeWire, MessageFactory messageFactory) {
this.binding = binding;
this.runtimeWire = runtimeWire;
this.messageFactory = messageFactory;
}
public Invoker getNext() {
return this.next;
}
public void setNext(Invoker next) {
this.next = next;
}
public Message invoke(Message msg) {
HTTPBindingContext bindingContext = msg.getBindingContext();
if ("smd".equals(bindingContext.getHttpRequest().getQueryString())) {
return getNext().invoke(msg);
}
JSONObject jsonReq = null;
String method = null;
try {
Object[] args = msg.getBody();
CharArrayWriter data = (CharArrayWriter) args[0];
jsonReq = new JSONObject(data.toString());
method = jsonReq.getString("method");
} catch (Exception e) {
Throwable exception = new RuntimeException("Unable to parse request", e);
}
Operation jsonOperation = findOperation(method);
msg.setOperation(jsonOperation);
msg.setBody(jsonReq);
return getNext().invoke(msg);
}
/**
* Find the operation from the component service contract
* @param componentService
* @param method
* @return
*/
private Operation findOperation(String method) {
if (method.contains(".")) {
method = method.substring(method.lastIndexOf(".") + 1);
}
List<Operation> operations = runtimeWire.getTarget().getInterfaceContract().getInterface().getOperations();
Operation result = null;
for (Operation o : operations) {
if (o.getName().equalsIgnoreCase(method)) {
result = o;
break;
}
}
return result;
}
/**
* Create a Fault Message with a JSON representation of the current exception
* @param throwable
* @return
*/
private Message createJSONFaultMessage(Throwable throwable) {
Message jsonFaultMessage = messageFactory.createMessage();
JSONRPCResult jsonFault = new JSONRPCResult(JSONRPCResult.CODE_REMOTE_EXCEPTION, null, throwable);
jsonFaultMessage.setBody(jsonFault);
return jsonFaultMessage;
}
}