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/*
 * Copyright (c) 2011.  Peter Lawrey
 *
 * "THE BEER-WARE LICENSE" (Revision 128)
 * As long as you retain this notice you can do whatever you want with this stuff.
 * If we meet some day, and you think this stuff is worth it, you can buy me a beer in return
 * There is no warranty.
 */

package com.google.code.java.core.socket;

import org.junit.Test;

import java.io.Closeable;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedByInterruptException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Arrays;

public class PingTest {
    @Test
    public void testSocketWriteReadLatency() throws IOException, InterruptedException {
        EchoService es = new EchoService(9999);

        SocketChannel sc = SocketChannel.open(new InetSocketAddress("localhost", 9999));

        ByteBuffer bb = ByteBuffer.allocateDirect(1 * 1024);

        long times[] = new long[1000 * 1000];
        for (int i = -11000; i < times.length; i++) {
            long start = System.nanoTime();
            bb.position(0);
            bb.limit(1024);
            sc.write(bb);

            bb.clear();
            sc.read(bb);
            long end = System.nanoTime();
            long err = System.nanoTime() - end;
            long time = end - start - err;
            if (i >= 0)
                times[i] = time;
        }

        es.stop();
        close(sc);
        Arrays.sort(times);
        System.out.printf("Socket latency was 1/50/99%%tile %.1f/%.1f/%.1f us%n",
                times[times.length / 100] / 1e3,
                times[times.length / 2] / 1e3,
                times[times.length - times.length / 100 - 1] / 1e3
        );
    }

    @Test
    public void testSocketWriteReadThroughput() throws IOException, InterruptedException {
        final ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.socket().bind(new InetSocketAddress("localhost", 9999));

        SocketChannel sc = SocketChannel.open(new InetSocketAddress("localhost", 9999));
        configure(sc);
        SocketChannel sc2 = ssc.accept();
        configure(sc2);
        close(ssc);

        ByteBuffer bb = ByteBuffer.allocateDirect(4096);
        ByteBuffer bb2 = ByteBuffer.allocateDirect(4096);

        long start = System.nanoTime();
        int runs = 1000 * 1000;
        for (int i = 0; i < runs; i++) {
            bb.position(0);
            bb.limit(1024);
            sc.write(bb);

            bb2.clear();
            sc2.read(bb2);
            bb2.flip();
            sc2.write(bb2);

            bb.clear();
            sc.read(bb);
        }
        long time = System.nanoTime() - start;

        close(sc);
        close(sc2);
        System.out.printf("Socket Throughput was %,d K/s%n", runs * 1000000L / time);
    }

    @Test
    public void testSocketLatency() throws IOException, InterruptedException {
        final ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.socket().bind(new InetSocketAddress("localhost", 9999));
        Thread server = new Thread(new Runnable() {
            public void run() {
                SocketChannel sc2 = null;
                try {
                    sc2 = ssc.accept();
                    configure(sc2);
                    sc2.configureBlocking(false);
                    close(ssc);
                    ByteBuffer bb2 = ByteBuffer.allocateDirect(4096);
                    while (!Thread.interrupted()) {
                        bb2.clear();
                        do {
                            sc2.read(bb2);
                        } while (bb2.position() == 0);
                        bb2.flip();
                        sc2.write(bb2);
                    }
                } catch (ClosedByInterruptException ignored) {
                } catch (ClosedChannelException ignored) {
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    close(sc2);
                }
            }
        });
        server.start();
        SocketChannel sc = SocketChannel.open(new InetSocketAddress("localhost", 9999));
        configure(sc);
        ByteBuffer bb = ByteBuffer.allocateDirect(4096);
        long times[] = new long[1000 * 1000];
        for (int i = -10000; i < times.length; i++) {
            long start = System.nanoTime();
            bb.position(0);
            bb.limit(32);
            sc.write(bb);


            bb.clear();
            sc.read(bb);
            long end = System.nanoTime();
            long err = System.nanoTime() - end;
            long time = end - start - err;
            if (i >= 0)
                times[i] = time;
        }
        server.interrupt();
        close(sc);
        Arrays.sort(times);
        System.out.printf("Threaded Socket Latency for 1/50/99%%tile %.1f/%.1f/%.1f us%n",
                times[times.length / 100] / 1e3,
                times[times.length / 2] / 1e3,
                times[times.length - times.length / 100 - 1] / 1e3
        );
    }

    @Test
    public void testSocketThreadedThroughput() throws IOException, InterruptedException {
        final ServerSocketChannel ssc = ServerSocketChannel.open();
        ssc.socket().bind(new InetSocketAddress("localhost", 9999));

        Thread server = new Thread(new Runnable() {
            @Override
            public void run() {
                SocketChannel sc2 = null;
                try {
                    sc2 = ssc.accept();
                    configure(sc2);
                    close(ssc);
                    ByteBuffer bb2 = ByteBuffer.allocateDirect(4096);
                    while (!Thread.interrupted()) {
                        bb2.clear();
                        sc2.read(bb2);
                        bb2.flip();
                        sc2.write(bb2);
                    }
                } catch (ClosedByInterruptException ignored) {
                } catch (ClosedChannelException ignored) {
                } catch (IOException e) {
                    e.printStackTrace();
                } finally {
                    close(sc2);
                }
            }
        });
        server.start();
        SocketChannel sc = SocketChannel.open(new InetSocketAddress("localhost", 9999));
        configure(sc);

        ByteBuffer bb = ByteBuffer.allocateDirect(4096);

        long start = System.nanoTime();
        int runs = 1000 * 1000;
        for (int i = 0; i < runs; i += 2) {
            bb.position(0);
            bb.limit(1024);
            sc.write(bb);

            bb.position(0);
            bb.limit(1024);
            sc.write(bb);

            bb.clear();
            sc.read(bb);
        }
        server.interrupt();
        server.join();
        long time = System.nanoTime() - start;
        close(sc);
        System.out.printf("Threaded Socket Throughput was %,d K/s%n", runs * 1000000L / time);
    }

    static void close(Closeable sc2) {
        if (sc2 != null) try {
            sc2.close();
        } catch (IOException ignored) {
        }
    }


    static void configure(SocketChannel sc) throws SocketException {
        sc.socket().setTcpNoDelay(true);
    }
}