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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.http.wireformat.jsonrpc.provider;
import org.apache.tuscany.sca.binding.http.HTTPBinding;
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.JSONArray;
import org.json.JSONObject;
import org.osoa.sca.ServiceRuntimeException;
import com.metaparadigm.jsonrpc.JSONRPCResult;
public class JSONRPCWireFormatInterceptor implements Interceptor {
private Invoker next;
private RuntimeWire runtimeWire;
private HTTPBinding binding;
private MessageFactory messageFactory;
public JSONRPCWireFormatInterceptor(HTTPBinding binding, RuntimeWire runtimeWire, MessageFactory messageFactory) {
this.binding = binding;
this.runtimeWire = runtimeWire;
this.messageFactory = messageFactory;
}
public Invoker getNext() {
return next;
}
public void setNext(Invoker next) {
this.next = next;
}
public Message invoke(Message msg) {
JSONObject jsonReq = (JSONObject) msg.getBody();
String method = null;
Object[] args = null;
Object id = null;
try {
// Extract the method
method = jsonReq.getString("method");
if ((method != null) && (method.indexOf('.') < 0)) {
jsonReq.putOpt("method", "Service" + "." + method);
}
// Extract the arguments
JSONArray array = jsonReq.getJSONArray("params");
args = new Object[array.length()];
for (int i = 0; i < args.length; i++) {
args[i] = array.get(i);
}
id = jsonReq.get("id");
} catch (Exception e) {
throw new RuntimeException("Unable to find json method name", e);
}
Message responseMessage = null;
try {
msg.setBody(args);
responseMessage = runtimeWire.getInvocationChain(msg.getOperation()).getHeadInvoker().invoke(msg);
} catch (RuntimeException re) {
Throwable exception = new RuntimeException("Error invoking service :" + re.getMessage(), re);
return createJSONFaultMessage(re);
}
Object result = null;
if (!responseMessage.isFault()) {
//successful execution of the invocation
try {
result = responseMessage.getBody();
JSONObject jsonResponse = new JSONObject();
jsonResponse.put("result", result);
jsonResponse.putOpt("id", id);
//get response to send to client
responseMessage.setBody(jsonResponse);
return responseMessage;
} catch (Exception e) {
throw new ServiceRuntimeException("Unable to create JSON response", e);
}
} else {
//exception thrown while executing the invocation
Throwable exception = (Throwable)responseMessage.getBody();
return createJSONFaultMessage(exception);
}
}
private Message createJSONFaultMessage(Throwable throwable) {
Message jsonFaultMessage = messageFactory.createMessage();
JSONRPCResult jsonFault = new JSONRPCResult(JSONRPCResult.CODE_REMOTE_EXCEPTION, null, throwable);
jsonFaultMessage.setBody(jsonFault);
return jsonFaultMessage;
}
}
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