Timing.java revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 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 */
24package com.sun.hotspot.igv.hierarchicallayout;
25
26/**
27 *
28 * @author Thomas Wuerthinger
29 */
30public class Timing {
31
32    private long lastValue;
33    private long sum;
34    private String name;
35
36    public Timing(String name) {
37        this.name = name;
38    }
39
40    @Override
41    public String toString() {
42        long val = sum;
43        if (lastValue != 0) {
44            // Timer running
45            long newValue = System.nanoTime();
46            val += (newValue - lastValue);
47        }
48        return "Timing for " + name + " is: " + val / 1000000 + " ms";
49    }
50
51    public void print() {
52        System.out.println(toString());
53    }
54
55    public void start() {
56        lastValue = System.nanoTime();
57    }
58
59    public void stop() {
60        if (lastValue == 0) {
61            throw new IllegalStateException("You must call start before stop");
62        }
63        long newValue = System.nanoTime();
64        sum += newValue - lastValue;
65        lastValue = 0;
66    }
67}
68