1 /*
2 * This file is part of Waarp Project (named also Waarp or GG).
3 *
4 * Copyright (c) 2019, Waarp SAS, 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 Waarp Project is free software: you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation, either version 3 of the License, or (at your
11 * option) any later version.
12 *
13 * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY
14 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
15 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along with
18 * Waarp . If not, see <http://www.gnu.org/licenses/>.
19 */
20 package org.waarp.common.cpu;
21
22 import com.jezhumble.javasysmon.CpuTimes;
23 import com.jezhumble.javasysmon.JavaSysMon;
24
25 /**
26 *
27 */
28 class CpuManagementSysmon implements CpuManagementInterface {
29 public static final long DELAY = 1000;
30
31 final JavaSysMon sysMon;
32
33 CpuTimes cpuTimesOld;
34 CpuTimes cpuTimesOldNext;
35 long time;
36
37 /**
38 * @throws UnsupportedOperationException if System Load Average is
39 * not
40 * supported
41 */
42 public CpuManagementSysmon() throws UnsupportedOperationException {
43 sysMon = new JavaSysMon();
44 cpuTimesOld = sysMon.cpuTimes();
45 cpuTimesOldNext = cpuTimesOld;
46 time = System.currentTimeMillis();
47 }
48
49 /**
50 * @return the load average
51 */
52 @Override
53 public final double getLoadAverage() {
54 final long newTime = System.currentTimeMillis();
55 final CpuTimes cpuTimes = sysMon.cpuTimes();
56 final double rate = cpuTimes.getCpuUsage(cpuTimesOld);
57 final long delta = newTime - time;
58 if (delta > DELAY) {
59 if (delta > 10 * DELAY) {
60 time = newTime;
61 cpuTimesOldNext = cpuTimes;
62 cpuTimesOld = cpuTimes;
63 } else {
64 time = newTime;
65 cpuTimesOldNext = cpuTimes;
66 cpuTimesOld = cpuTimesOldNext;
67 }
68 }
69 return rate;
70 }
71
72 }