1 /**
2 This file is part of GoldenGate Project (named also GoldenGate or GG).
3
4 Copyright 2009, Frederic Bregier, and individual contributors by the @author
5 tags. See the COPYRIGHT.txt in the distribution for a full listing of
6 individual contributors.
7
8 All GoldenGate Project is free software: you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as published
10 by the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
12
13 GoldenGate is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GoldenGate . If not, see <http://www.gnu.org/licenses/>.
20 */
21 package goldengate.common.cpu;
22
23 import java.lang.management.ManagementFactory;
24 import java.lang.management.OperatingSystemMXBean;
25
26 /**
27 * @author bregier
28 *
29 */
30 public class CpuManagement implements CpuManagementInterface {
31 OperatingSystemMXBean osBean;
32
33 /**
34 *
35 * @throws UnsupportedOperationException
36 * if System Load Average is not supported
37 */
38 public CpuManagement() throws UnsupportedOperationException {
39 osBean = ManagementFactory.getOperatingSystemMXBean();
40 if (osBean.getSystemLoadAverage() < 0) {
41 osBean = null;
42 throw new UnsupportedOperationException(
43 "System Load Average not supported");
44 }
45 }
46
47 /**
48 *
49 * @return the load average
50 */
51 public double getLoadAverage() {
52 return osBean.getSystemLoadAverage();
53 }
54
55 public static void main(String[] args) {
56 long total = 0;
57 CpuManagement cpuManagement = new CpuManagement();
58 System.err.println("LA: " + cpuManagement.getLoadAverage());
59 for (int i = 0; i < 1000 * 1000 * 1000; i ++) {
60 // keep ourselves busy for a while ...
61 // note: we had to add some "work" into the loop or Java 6
62 // optimizes it away. Thanks to Daniel Einspanjer for
63 // pointing that out.
64 total += i;
65 total *= 10;
66 }
67 System.err.println("LA: " + cpuManagement.getLoadAverage());
68
69 total = 0;
70 for (int i = 0; i < 1000 * 1000 * 1000; i ++) {
71 // keep ourselves busy for a while ...
72 // note: we had to add some "work" into the loop or Java 6
73 // optimizes it away. Thanks to Daniel Einspanjer for
74 // pointing that out.
75 total += i;
76 total *= 10;
77 }
78 System.err.println("LA: " + cpuManagement.getLoadAverage());
79 try {
80 Thread.sleep(10000);
81 } catch (InterruptedException e) {
82 }
83 System.err.println("LA: " + cpuManagement.getLoadAverage());
84
85 total = 0;
86 for (int i = 0; i < 1000 * 1000 * 1000; i ++) {
87 // keep ourselves busy for a while ...
88 // note: we had to add some "work" into the loop or Java 6
89 // optimizes it away. Thanks to Daniel Einspanjer for
90 // pointing that out.
91 total += i;
92 total *= 10;
93 }
94 System.err.println("LA: " + cpuManagement.getLoadAverage());
95 }
96 }