/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * 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.apache.qpid.flow;

import org.apache.qpid.client.AMQConnection;
import org.apache.qpid.client.AMQDestination;
import org.apache.qpid.client.AMQQueue;
import org.apache.qpid.client.AMQSession;

import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.MessageProducer;

public class ChannelFlowTest implements MessageListener
{
    private int sent;
    private int received;

    ChannelFlowTest(String broker) throws Exception
    {
        this(new AMQConnection(broker, "guest", "guest", randomize("Client"), "/test_path"));
    }

    ChannelFlowTest(AMQConnection connection) throws Exception
    {
        this(connection, new AMQQueue(randomize("ChannelFlowTest"), true));
    }

    ChannelFlowTest(AMQConnection connection, AMQDestination destination) throws Exception
    {
        AMQSession session = (AMQSession) connection.createSession(false, AMQSession.NO_ACKNOWLEDGE, 50,25);

        //set up a slow consumer
        session.createConsumer(destination).setMessageListener(this);
        connection.start();

        //create a publisher
        MessageProducer producer = session.createProducer(destination);
        Message msg = session.createTextMessage("Message");

        //publish in bursts that are fast enough to cause channel flow control
        for(int i = 0; i < 10; i++)
        {
            for(int j = 0; j < 100; j++)
            {
                producer.send(msg);
                sent++;
            }
            waitUntilReceived(sent - 40);
        }

        waitUntilReceived(sent);

        session.close();
        connection.close();
    }


    private synchronized void waitUntilReceived(int count) throws InterruptedException
    {
        while(received <count)
        {
            wait();
        }
    }

    public synchronized void onMessage(Message message)
    {
        try
        {
            Thread.sleep(50);

            received++;
            notify();
        }
        catch (InterruptedException e)
        {
            e.printStackTrace();
        }
    }

    private static String randomize(String in)
    {
        return in + System.currentTimeMillis();
    }

    public static void main(String[] argv) throws Exception
    {
        new ChannelFlowTest(argv.length == 0 ? "localhost:5672" : argv[0]);
    }

}
