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package com.sun.grizzly.samples.udpecho;

import java.io.IOException;
import java.util.Arrays;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.logging.Logger;
import com.sun.grizzly.Connection;
import com.sun.grizzly.StandaloneProcessor;
import com.sun.grizzly.TransportFactory;
import com.sun.grizzly.nio.transport.UDPNIOTransport;
import com.sun.grizzly.streams.StreamReader;
import com.sun.grizzly.streams.StreamWriter;

/**
 * The simple client, which sends a message to the echo server
 * and waits for response
 * @author Alexey Stashok
 */
public class EchoClient {
    private static final Logger logger = Logger.getLogger(EchoClient.class.getName());

    public static void main(String[] args) throws IOException,
            ExecutionException, InterruptedException, TimeoutException {

        Connection connection = null;
        StreamReader reader = null;
        StreamWriter writer = null;
        
        // Create the UDP transport
        UDPNIOTransport transport = TransportFactory.getInstance().
                createUDPTransport();

        try {
            // start the transport
            transport.start();

            // perform async. connect to the server
            Future<Connection> future = transport.connect(EchoServer.HOST,
                    EchoServer.PORT);
            // wait for connect operation to complete
            connection = future.get(10, TimeUnit.SECONDS);

            assert connection != null;

            connection.configureStandalone(true);
            
            writer = StandaloneProcessor.INSTANCE.getStreamWriter(connection);
            String message = "Echo test";
            byte[] sendBytes = message.getBytes();

            // sync. write the complete message using
            // temporary selectors if required
            writer.writeByteArray(sendBytes);
            Future<Integer> writeFuture = writer.flush();
            writeFuture.get();

            assert writeFuture.isDone();

            reader = StandaloneProcessor.INSTANCE.getStreamReader(connection);
            // allocate the buffer for receiving bytes
            byte[] receiveBytes = new byte[sendBytes.length];
            Future readFuture = reader.notifyAvailable(receiveBytes.length);

            readFuture.get();

            reader.readByteArray(receiveBytes);

            // check the result
            final boolean isEqual = Arrays.equals(sendBytes, receiveBytes);
            assert isEqual;
            logger.info("Echo came successfully");
        } finally {
            // close the client connection
            if (connection != null) {
                connection.close();
            }

            // stop the transport
            transport.stop();
            // release TransportManager resources like ThreadPool etc.
            TransportFactory.getInstance().close();
        }
    }
}