| 1 | package de.uka.ipd.sdq.measurement.strategies.system; |
| 2 | |
| 3 | import java.io.File; |
| 4 | import java.lang.management.ManagementFactory; |
| 5 | |
| 6 | import javax.measure.quantity.Duration; |
| 7 | import javax.measure.unit.SI; |
| 8 | |
| 9 | import org.jscience.physics.amount.Amount; |
| 10 | |
| 11 | /** |
| 12 | * Helper class for monitoring system resources. |
| 13 | * |
| 14 | * @author Thomas Zolynski |
| 15 | * |
| 16 | */ |
| 17 | public final class SystemResourcesUtil { |
| 18 | |
| 19 | /** |
| 20 | * Sun's implementation of OperatingSystemMXBean is used. |
| 21 | * Eclipse is not very fond of this import (Forbidden references), so you might have to |
| 22 | * change your preferences (Java -> Compiler -> Errors/Warnings -> Forbidden references) |
| 23 | */ |
| 24 | private static final com.sun.management.OperatingSystemMXBean os = (com.sun.management.OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean(); |
| 25 | |
| 26 | /** |
| 27 | * This systems' temp directory. Due to inconsistencies |
| 28 | * between different systems a file separator is added. |
| 29 | */ |
| 30 | public static final File TEMP_DIR = new File(System.getProperty("java.io.tmpdir") + System.getProperty("file.separator")); |
| 31 | |
| 32 | /** |
| 33 | * Returns the total size of the physical memory in bytes. |
| 34 | * |
| 35 | * @return total memory in bytes |
| 36 | */ |
| 37 | public static long getTotalPhysicalMemorySize() { |
| 38 | return os.getTotalPhysicalMemorySize(); |
| 39 | } |
| 40 | |
| 41 | /** |
| 42 | * Returns the free physical memory in bytes. |
| 43 | * |
| 44 | * @return free memory in bytes |
| 45 | */ |
| 46 | public static long getFreePhysicalMemorySize() { |
| 47 | return os.getFreePhysicalMemorySize(); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Returns the free space of the temp directory |
| 52 | * |
| 53 | * @return free space in bytes |
| 54 | */ |
| 55 | public static long getFreeTempDirectorySize() { |
| 56 | return TEMP_DIR.getUsableSpace(); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Returns the number of CPU cores. |
| 61 | * |
| 62 | * @return CPU cores |
| 63 | */ |
| 64 | public static int getCPUCores() { |
| 65 | return os.getAvailableProcessors(); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Returns the CPU time used by this JVM |
| 70 | * @return CPU usage in nanoseconds |
| 71 | */ |
| 72 | public static double getCPUProcessTimeNS() { |
| 73 | return os.getProcessCpuTime(); |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Returns the CPU time used by this JVM |
| 78 | * @return CPU usage as a JScience object |
| 79 | */ |
| 80 | public static Amount<Duration> getCPUProcessTime() { |
| 81 | return Amount.valueOf(getCPUProcessTimeNS(), SI.NANO(SI.SECOND)); |
| 82 | } |
| 83 | |
| 84 | } |