TCPLatencyBenchmark.java

/*
 * Minha.pt: middleware testing platform.
 * Copyright (c) 2011-2014, Universidade do Minho.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package pt.minha.calibration;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.management.ManagementFactory;
import java.net.ServerSocket;
import java.net.Socket;

public class TCPLatencyBenchmark extends AbstractBenchmark {
	
	@Override
	public Object client() throws IOException {
		Socket s = new Socket(srv.getAddress(), srv.getPort());
		OutputStream out = s.getOutputStream();
		InputStream in = s.getInputStream();
		byte[] buffer = new byte[payload];

		for (int i = 0; i < 10; i++) {
			out.write(buffer);
			if (!readFully(in, buffer))
				break;
			System.nanoTime();
			ManagementFactory.getThreadMXBean().getCurrentThreadCpuTime();
		}

		start();
		long prev = System.nanoTime();
		for (int i = 0; i < samples; i++) {
			out.write(buffer);
			if (!readFully(in, buffer))
				break;
			long time = System.nanoTime();
			add(payload, time-prev);
			prev = time;
		}
		Result r = stop(false);
		
		s.close();
		
		return r;
	}

	@Override
	public Object server() throws IOException {
		ServerSocket ss = new ServerSocket(srv.getPort());
		Socket s = ss.accept();
		OutputStream out = s.getOutputStream();
		InputStream in = s.getInputStream();
		byte[] buffer = new byte[payload];

		for (int i = 0; i < 10; i++) {
			if (!readFully(in, buffer))
				break;
			out.write(buffer);
			System.nanoTime();
			ManagementFactory.getThreadMXBean().getCurrentThreadCpuTime();
		}
		
		start();
		long prev = -1;
		for (int i = 0; i < samples; i++) {
			if (!readFully(in, buffer))
				break;
			long time = System.nanoTime();
			if (prev>0)
				add(payload, time-prev);
			
			prev = time;
			out.write(buffer);
		}
		Result r = stop(false);
		
		s.close();
		ss.close();

		return r;
	}

	public String toString() {
		return "TCP round-trip "+super.toString();
	}
}