org.jabsorb.ng.client.URLConnectionSession.java Source code

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Here is the source code for org.jabsorb.ng.client.URLConnectionSession.java

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/*
 * jabsorb - a Java to JavaScript Advanced Object Request Broker
 * http://www.jabsorb.org
 *
 * Copyright 2007-2008 The jabsorb team
 *
 * based on original code from
 * JSON-RPC-Client, a Java client extension to JSON-RPC-Java
 * (C) Copyright CodeBistro 2007, Sasha Ovsankin <sasha at codebistro dot com>
 *
 * Licensed 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.jabsorb.ng.client;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.net.URL;
import java.net.URLConnection;

import org.json.JSONException;
import org.json.JSONObject;
import org.json.JSONTokener;

/**
 * Transport based on URLConnection
 * 
 */
public class URLConnectionSession implements ISession {

    URL url;

    /**
     * Create a URLConnection transport
     * 
     * @param url
     */
    URLConnectionSession(URL url) {

        this.url = url;
    }

    public void close() {

    }

    public JSONObject sendAndReceive(JSONObject message) {

        try {
            URLConnection connection = url.openConnection();
            connection.setDoOutput(true);
            // As per
            // http://java.sun.com/docs/books/tutorial/networking/urls/readingWriting.html
            Writer request = new OutputStreamWriter(connection.getOutputStream());
            request.write(message.toString());
            request.close();
            // TODO the following sequence of reading a string out of output
            // stream is too complicated
            // there must be a simpler way
            StringBuffer builder = new StringBuffer(1024);
            char[] buffer = new char[1024];
            Reader reader = new InputStreamReader(connection.getInputStream());
            while (true) {
                int bytesRead = reader.read(buffer);
                if (bytesRead < 0)
                    break;
                builder.append(buffer, 0, bytesRead);
            }
            reader.close();
            JSONTokener tokener = new JSONTokener(builder.toString());
            Object rawResponseMessage = tokener.nextValue();
            JSONObject responseMessage = (JSONObject) rawResponseMessage;
            if (responseMessage == null)
                throw new ClientError("Invalid response type - " + rawResponseMessage.getClass());
            return responseMessage;
        } catch (IOException ex) {
            throw new ClientError(ex);
        } catch (JSONException ex) {
            throw new ClientError(ex);
        }
    }

}