/*
* 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.jsonp.runtime;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.net.URLCodec;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.tuscany.sca.assembly.EndpointReference;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
public class JSONPInvoker implements Invoker {
protected Operation operation;
protected EndpointReference endpoint;
protected ObjectMapper mapper; // TODO: share mapper btw invoker and servlet or move to databinding
public JSONPInvoker(Operation operation, EndpointReference endpoint) {
this.operation = operation;
this.endpoint = endpoint;
this.mapper = new ObjectMapper();
}
public Message invoke(Message msg) {
try {
return doInvoke(msg);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public Message doInvoke(Message msg) throws JsonGenerationException, JsonMappingException, IOException, EncoderException {
String uri = endpoint.getBinding().getURI() + "/" + operation.getName();
//String[] jsonArgs = objectsToJSON((Object[])msg.getBody());
String[] jsonArgs = objectsToJSONStrings((Object[])msg.getBody());
String responseJSON = invokeHTTPRequest(uri, jsonArgs);
//Object response = jsonToObjects(responseJSON)[0];
msg.setBody(responseJSON);
return msg;
}
protected String invokeHTTPRequest(String url, String[] jsonArgs) throws IOException, EncoderException {
HttpClient httpclient = new DefaultHttpClient();
URLCodec uc = new URLCodec();
for (int i=0 ; i<jsonArgs.length; i++) {
if (i == 0) {
url += '?';
} else {
url += '&';
}
url += "arg" + i + "=";
url += uc.encode(jsonArgs[i]);
}
HttpGet httpget = new HttpGet(url);
HttpResponse response = httpclient.execute(httpget);
StringBuffer responseJSON = new StringBuffer();
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to worry about connection release
if (entity != null) {
InputStream instream = entity.getContent();
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(instream));
String s = null;
while ((s = reader.readLine()) != null) {
responseJSON.append(s);
}
} catch (IOException ex) {
// In case of an IOException the connection will be released
// back to the connection manager automatically
throw ex;
} catch (RuntimeException ex) {
// In case of an unexpected exception you may want to abort
// the HTTP request in order to shut down the underlying
// connection and release it back to the connection manager.
httpget.abort();
throw ex;
} finally {
// Closing the input stream will trigger connection release
instream.close();
}
// When HttpClient instance is no longer needed,
// shut down the connection manager to ensure
// immediate deallocation of all system resources
httpclient.getConnectionManager().shutdown();
}
return responseJSON.toString();
}
/* Not required now JSON conversion is delegated to databinding
protected String[] objectsToJSON(Object[] msgArgs) throws JsonGenerationException, JsonMappingException, IOException {
String[] jsonArgs = new String[msgArgs.length];
for (int i=0; i<msgArgs.length; i++) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
mapper.writeValue(os , msgArgs[i]);
jsonArgs[i] = os.toString();
}
return jsonArgs;
}
*/
protected String[] objectsToJSONStrings(Object[] msgArgs) throws JsonGenerationException, JsonMappingException, IOException {
String[] jsonArgs = new String[msgArgs.length];
for (int i=0; i<msgArgs.length; i++) {
jsonArgs[i] = msgArgs[i].toString();
}
return jsonArgs;
}
/* Not required now JSON conversion is delegated to databinding
protected Object[] jsonToObjects(String jsonRequest) throws JsonParseException, JsonMappingException, IOException {
Class<?> c = new Object[0].getClass();
Object[] args = (Object[])mapper.readValue("[" + jsonRequest +"]", c);
return args;
}
*/
}