Coverage Report

Coverage Report - sk.baka.webvm.analyzer.CpuUsage

Classes in this File

Line Coverage

Branch Coverage

Complexity

CpuUsage

64%

16/25

50%

4/8

 /**
  * Copyright 2009 Martin Vysny.
  *
  * This file is part of WebVM.
  *
  * WebVM is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * WebVM is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with WebVM.  If not, see <http://www.gnu.org/licenses/>.
  */
 package sk.baka.webvm.analyzer;
 
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import sk.baka.webvm.analyzer.hostos.Cpu;
 
 /**
  * Provides a CPU measurement support.
  * @author Martin Vysny
  */
 public final class CpuUsage {
 
     private static final Logger LOG = Logger.getLogger(Cpu.class.getName());
     /**
      * The CPU usage measurer.
      */
     private final ICpuUsageMeasure cpuUsage;
 
     /**
      * Creates a new CPU usage measurer.
      * @param usage retrieve usage data from this object.
      */
     public CpuUsage(final ICpuUsageMeasure usage) {
         if (usage.supported()) {
             cpuUsage = usage;
         } else {
             cpuUsage = null;
         }
     }
 
     /**
      * Checks if this measurement is supported.
      * @return true if supported, false if {@link #getCpuUsage()} will always return -1.
      */
     public boolean supported() {
         return cpuUsage != null;
     }
 
     /**
      * Returns an average CPU usage in a time slice starting at the previous call of this method.
      * @return average overall CPU usage or -1 if CPU sampling is unsupported or error occurred.
      */
     public int getCpuUsage() {
         if (cpuUsage == null) {
             return -1;
         }
         if (cpuMeasurement == null) {
             try {
                 cpuMeasurement = cpuUsage.measure();
             } catch (Exception ex) {
                 LOG.log(Level.SEVERE, "Failed to measure a CPU usage", ex);
                 return -1;
             }
             return 0;
         }
         final Object newMeasurement;
         try {
             newMeasurement = cpuUsage.measure();
         } catch (Exception ex) {
             LOG.log(Level.SEVERE, "Failed to measure a CPU usage", ex);
             return -1;
         }
         final int result = cpuUsage.getAvgCpuUsage(cpuMeasurement, newMeasurement);
         cpuMeasurement = newMeasurement;
         return result;
     }
     private Object cpuMeasurement = null;
 }

1		/**
2		* Copyright 2009 Martin Vysny.
3		*
4		* This file is part of WebVM.
5		*
6		* WebVM is free software: you can redistribute it and/or modify
7		* it under the terms of the GNU General Public License as published by
8		* the Free Software Foundation, either version 3 of the License, or
9		* (at your option) any later version.
10		*
11		* WebVM is distributed in the hope that it will be useful,
12		* but WITHOUT ANY WARRANTY; without even the implied warranty of
13		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14		* GNU General Public License for more details.
15		*
16		* You should have received a copy of the GNU General Public License
17		* along with WebVM. If not, see <http://www.gnu.org/licenses/>.
18		*/
19		package sk.baka.webvm.analyzer;
20
21		import java.util.logging.Level;
22		import java.util.logging.Logger;
23		import sk.baka.webvm.analyzer.hostos.Cpu;
24
25		/**
26		* Provides a CPU measurement support.
27		* @author Martin Vysny
28		*/
29		public final class CpuUsage {
30
31	1	private static final Logger LOG = Logger.getLogger(Cpu.class.getName());
32		/**
33		* The CPU usage measurer.
34		*/
35		private final ICpuUsageMeasure cpuUsage;
36
37		/**
38		* Creates a new CPU usage measurer.
39		* @param usage retrieve usage data from this object.
40		*/
41	11	public CpuUsage(final ICpuUsageMeasure usage) {
42	11	if (usage.supported()) {
43	11	cpuUsage = usage;
44		} else {
45	0	cpuUsage = null;
46		}
47	11	}
48
49		/**
50		* Checks if this measurement is supported.
51		* @return true if supported, false if {@link #getCpuUsage()} will always return -1.
52		*/
53		public boolean supported() {
54	0	return cpuUsage != null;
55		}
56
57		/**
58		* Returns an average CPU usage in a time slice starting at the previous call of this method.
59		* @return average overall CPU usage or -1 if CPU sampling is unsupported or error occurred.
60		*/
61		public int getCpuUsage() {
62	8	if (cpuUsage == null) {
63	0	return -1;
64		}
65	8	if (cpuMeasurement == null) {
66		try {
67	4	cpuMeasurement = cpuUsage.measure();
68	0	} catch (Exception ex) {
69	0	LOG.log(Level.SEVERE, "Failed to measure a CPU usage", ex);
70	0	return -1;
71	4	}
72	4	return 0;
73		}
74		final Object newMeasurement;
75		try {
76	4	newMeasurement = cpuUsage.measure();
77	0	} catch (Exception ex) {
78	0	LOG.log(Level.SEVERE, "Failed to measure a CPU usage", ex);
79	0	return -1;
80	4	}
81	4	final int result = cpuUsage.getAvgCpuUsage(cpuMeasurement, newMeasurement);
82	4	cpuMeasurement = newMeasurement;
83	4	return result;
84		}
85	11	private Object cpuMeasurement = null;
86		}