/bench/kilim/bench/ThreadPipePingPong.java

 1/* Copyright (c) 2006, Sriram Srinivasan
 2 *
 3 * You may distribute this software under the terms of the license 
 4 * specified in the file "License"
 5 */
 6
 7package kilim.bench;
 8
 9import java.io.PipedInputStream;
10import java.io.PipedOutputStream;
11
12
13// Create two threads, have a message ping pong between them using pipes.
14public class ThreadPipePingPong {
15    public static void main(String args[]) throws Exception {
16        int ntimes = args.length == 0 ? 1000 : Integer.parseInt(args[0]);
17        PipedInputStream  pi_in = new PipedInputStream();
18        PipedOutputStream pi_out = new PipedOutputStream();
19        PipedInputStream  po_in = new PipedInputStream(pi_out);
20        PipedOutputStream po_out = new PipedOutputStream(pi_in);
21        
22        PongThread po = new PongThread(po_in, po_out);
23        PingThread pi = new PingThread(ntimes, pi_in, pi_out);
24        po.start();
25        pi.start();
26    }
27}
28
29class PingThread extends Thread {
30    int ntimes;
31    PipedInputStream in;
32    PipedOutputStream out;
33    PingThread(int n, PipedInputStream i, PipedOutputStream o) {
34        ntimes = n;
35        in  = i;
36        out = o;
37    }
38    public void run() {
39        try {
40            long begin = System.currentTimeMillis();
41            for (int i = 0; i < ntimes; i++) {
42                out.write(100); out.flush(); //ping
43                in.read(); // wait for pong
44            }
45            System.out.println("Elapsed (" + ntimes + " iters) : " + 
46                    (System.currentTimeMillis() - begin) + " millis");
47            System.exit(0);
48        } catch (Exception e) {
49            e.printStackTrace();
50        }
51    }
52}
53
54class PongThread extends Thread {
55    PipedInputStream in;
56    PipedOutputStream out;
57
58    PongThread(PipedInputStream i, PipedOutputStream o) {
59        in = i;
60        out = o;
61    }
62    public void run() {
63        try {
64            while (true) {
65                in.read();
66                out.write(200); out.flush();
67            }
68        } catch (Exception e) {
69            e.printStackTrace();
70        }
71    }
72}