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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.
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//   The contents of this file are subject to the Mozilla Public License
//   Version 1.1 (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.mozilla.org/MPL/
//
//   Software distributed under the License is distributed on an "AS IS"
//   basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
//   License for the specific language governing rights and limitations
//   under the License.
//
//   The Original Code is RabbitMQ.
//
//   The Initial Developers of the Original Code are LShift Ltd,
//   Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
//
//   Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
//   Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
//   are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
//   Technologies LLC, and Rabbit Technologies Ltd.
//
//   Portions created by LShift Ltd are Copyright (C) 2007-2010 LShift
//   Ltd. Portions created by Cohesive Financial Technologies LLC are
//   Copyright (C) 2007-2010 Cohesive Financial Technologies
//   LLC. Portions created by Rabbit Technologies Ltd are Copyright
//   (C) 2007-2010 Rabbit Technologies Ltd.
//
//   All Rights Reserved.
//
//   Contributor(s): ______________________________________.
//

package com.rabbitmq.client;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
 * Subclass of RpcServer which accepts UTF-8 string requests.
 */
public class StringRpcServer extends RpcServer {
    public StringRpcServer(Channel channel) throws IOException
    { super(channel); }

    public StringRpcServer(Channel channel, String queueName) throws IOException
    { super(channel, queueName); }

    /**
     * Overridden to do UTF-8 processing, and delegate to
     * handleStringCall. If UTF-8 is not understood by this JVM, falls
     * back to the platform default.
     */
    public byte[] handleCall(byte[] requestBody, AMQP.BasicProperties replyProperties)
    {
        String request;
        try {
            request = new String(requestBody, "UTF-8");
        } catch (UnsupportedEncodingException uee) {
            request = new String(requestBody);
        }
        String reply = handleStringCall(request, replyProperties);
        try {
            return reply.getBytes("UTF-8");
        } catch (UnsupportedEncodingException uee) {
            return reply.getBytes();
        }
    }

    /**
     * Delegates to handleStringCall(String).
     */
    public String handleStringCall(String request, AMQP.BasicProperties replyProperties)
    {
        return handleStringCall(request);
    }

    /**
     * Default implementation - override in subclasses. Returns the empty string.
     */
    public String handleStringCall(String request)
    {
        return "";
    }

    /**
     * Overridden to do UTF-8 processing, and delegate to
     * handleStringCast. If UTF-8 is not understood by this JVM, falls
     * back to the platform default.
     */
    public void handleCast(byte[] requestBody)
    {
        try {
            handleStringCast(new String(requestBody, "UTF-8"));
        } catch (UnsupportedEncodingException uee) {
            handleStringCast(new String(requestBody));
        }
    }

    /**
     * Default implementation - override in subclasses. Does nothing.
     */
    public void handleStringCast(String requestBody) {
        // Do nothing.
    }
}