1/*
2 * Copyright (c) 1999, 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/*
25 *
26 */
27
28package bench.serial;
29
30import bench.Benchmark;
31import java.io.ObjectInputStream;
32import java.io.ObjectOutputStream;
33import java.util.Random;
34
35/**
36 * Benchmark for testing speed of string reads/writes.
37 */
38public class Strings implements Benchmark {
39
40    /**
41     * Write and read strings to/from a stream.  The benchmark is run in
42     * batches: each "batch" consists of a fixed number of read/write cycles,
43     * and the stream is flushed (and underlying stream buffer cleared) in
44     * between each batch.
45     * Arguments: <string length> <# batches> <# cycles per batch>
46     */
47    public long run(String[] args) throws Exception {
48        int slen = Integer.parseInt(args[0]);
49        int nbatches = Integer.parseInt(args[1]);
50        int ncycles = Integer.parseInt(args[2]);
51        String[] strs = genStrings(slen, ncycles);
52        StreamBuffer sbuf = new StreamBuffer();
53        ObjectOutputStream oout =
54            new ObjectOutputStream(sbuf.getOutputStream());
55        ObjectInputStream oin =
56            new ObjectInputStream(sbuf.getInputStream());
57
58        doReps(oout, oin, sbuf, strs, 1, ncycles);      // warmup
59
60        long start = System.currentTimeMillis();
61        doReps(oout, oin, sbuf, strs, nbatches, ncycles);
62        return System.currentTimeMillis() - start;
63    }
64
65    /**
66     * Generate nstrings random strings, each of length len.
67     */
68    String[] genStrings(int len, int nstrings) {
69        String[] strs = new String[nstrings];
70        char[] ca = new char[len];
71        Random rand = new Random(System.currentTimeMillis());
72        for (int i = 0; i < nstrings; i++) {
73            for (int j = 0; j < len; j++) {
74                ca[j] = (char) rand.nextInt();
75            }
76            strs[i] = new String(ca);
77        }
78        return strs;
79    }
80
81    /**
82     * Run benchmark for given number of batches, with given number of cycles
83     * for each batch.
84     */
85    void doReps(ObjectOutputStream oout, ObjectInputStream oin,
86                StreamBuffer sbuf, String[] strs, int nbatches, int ncycles)
87        throws Exception
88    {
89        for (int i = 0; i < nbatches; i++) {
90            sbuf.reset();
91            oout.reset();
92            for (int j = 0; j < ncycles; j++) {
93                oout.writeObject(strs[j]);
94            }
95            oout.flush();
96            for (int j = 0; j < ncycles; j++) {
97                oin.readObject();
98            }
99        }
100    }
101}
102