/*
 *  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.mina.example.tcp.perf;

import java.net.InetSocketAddress;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.future.ConnectFuture;
import org.apache.mina.core.service.IoConnector;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IdleStatus;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.transport.socket.nio.NioSocketConnector;

/**
 * An UDP client taht just send thousands of small messages to a UdpServer. 
 * 
 * This class is used for performance test purposes. It does nothing at all, but send a message
 * repetitly to a server.
 * 
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class TcpClient extends IoHandlerAdapter {
    /** The connector */
    private IoConnector connector;

    /** The session */
    private static IoSession session;
    
    /** The buffer containing the message to send */
    private IoBuffer buffer = IoBuffer.allocate(8);
    
    /** Timers **/
    private long t0;
    private long t1;

    /** the counter used for the sent messages */
    private CountDownLatch counter;
    
    /**
     * Create the UdpClient's instance
     */
    public TcpClient() {
        connector = new NioSocketConnector();

        connector.setHandler(this);
        ConnectFuture connFuture = connector.connect(new InetSocketAddress("localhost", TcpServer.PORT));

        connFuture.awaitUninterruptibly();

        session = connFuture.getSession();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void exceptionCaught(IoSession session, Throwable cause) throws Exception {
        cause.printStackTrace();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void messageReceived(IoSession session, Object message) throws Exception {
        long received = ((IoBuffer)message).getLong();
        
        if (received != counter.getCount()) {
            System.out.println("Error !");
            session.closeNow();
        } else {
            if (counter.getCount() == 0L) {
                t1 = System.currentTimeMillis();
                
                System.out.println("------------->  end " + (t1 - t0));
                session.closeNow();
            } else {
                counter.countDown();
                
                buffer.flip();
                buffer.putLong(counter.getCount());
                buffer.flip();
                session.write(buffer);
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void messageSent(IoSession session, Object message) throws Exception {
        if (counter.getCount() % 10000 == 0) {
            System.out.println("Sent " + counter + " messages");
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void sessionClosed(IoSession session) throws Exception {
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void sessionCreated(IoSession session) throws Exception {
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void sessionIdle(IoSession session, IdleStatus status) throws Exception {
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void sessionOpened(IoSession session) throws Exception {
    }

    /**
     * The main method : instanciates a client, and send N messages. We sleep 
     * between each K messages sent, to avoid the server saturation.
     * @param args The arguments
     * @throws Exception If something went wrong
     */
    public static void main(String[] args) throws Exception {
        TcpClient client = new TcpClient();

        client.t0 = System.currentTimeMillis();
        client.counter = new CountDownLatch(TcpServer.MAX_RECEIVED);
        client.buffer.putLong(client.counter.getCount());
        client.buffer.flip();
        session.write(client.buffer);
        int nbSeconds = 0;

        while ((client.counter.getCount() > 0) && (nbSeconds < 120)) {
            // Wait for one second
            client.counter.await(1, TimeUnit.SECONDS);
            nbSeconds++;
        }

        client.connector.dispose(true);
    }
}
