SystemVersion (Javadocs [I2P+ 2.11.0+]

java.lang.Object
- net.i2p.util.SystemVersion

public abstract class SystemVersion
extends Object

Methods to find out what system we are running on

Field Summary

Fields
Modifier and Type Field and Description

static String DAEMON_USER

static boolean DEFAULT_OVERRIDE_IS_SLOW

static String GENTOO_USER

static String PROP_OVERRIDE_IS_SLOW

Fields
Modifier and Type	Field and Description
`static String`	`DAEMON_USER`
`static boolean`	`DEFAULT_OVERRIDE_IS_SLOW`
`static String`	`GENTOO_USER`
`static String`	`PROP_OVERRIDE_IS_SLOW`

Constructor Summary

Constructors
Constructor and Description

SystemVersion()

Constructors
Constructor and Description
`SystemVersion()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static int`	`getActiveThreads()` Returns the current number of active (live) threads in the JVM.
`static int`	`getAndroidVersion()` Identical to android.os.Build.VERSION.SDK_INT.
`static String`	`getArch()` returns the architecture of the system running I2P as a string for reference in clients.config and plugin.config files.
`static int`	`getCores()` Runtime.getRuntime().availableProcssors()
`static int`	`getCPULoad()` Retrieve CPU Load of the JVM.
`static int`	`getCPULoadAvg()` Retrieve CPU Load Average of the JVM.
`static long`	`getMaxMemory()` Runtime.getRuntime().maxMemory() but check for bogus values
`static String`	`getOS()` returns the OS of the system running I2P as a lower-case string for reference in clients.config and plugin.config files.
`static int`	`getSystemLoad()` Retrieve System Load as percentage (100% equals full system load)
`static TimeZone`	`getSystemTimeZone()` The system's time zone, which is probably different from the JVM time zone, because Router changes the JVM default to GMT.
`static TimeZone`	`getSystemTimeZone(I2PAppContext ctx)` The system's time zone, which is probably different from the JVM time zone, because Router changes the JVM default to GMT.
`static int`	`getTunnelBuildSuccess()` Retrieve Tunnel build success as a percentage.
`static boolean`	`hasWrapper()` Is the wrapper present? Same as I2PAppContext.hasWrapper()
`static boolean`	`is64Bit()` This isn't always correct.
`static boolean`	`isAndroid()`
`static boolean`	`isApache()` Apache Harmony JVM, or Android
`static boolean`	`isARM()`
`static boolean`	`isGentoo()`
`static boolean`	`isGNU()` gij or JamVM with GNU Classpath
`static boolean`	`isJava(int minVersion)` Handles Android also
`static boolean`	`isJava(String minVersion)` Handles Android, and minVersions in both forms (e.g.
`static boolean`	`isJava10()`
`static boolean`	`isJava11()`
`static boolean`	`isJava12()`
`static boolean`	`isJava13()`
`static boolean`	`isJava14()`
`static boolean`	`isJava15()`
`static boolean`	`isJava16()`
`static boolean`	`isJava17()`
`static boolean`	`isJava18()`
`static boolean`	`isJava19()`
`static boolean`	`isJava20()`
`static boolean`	`isJava21()`
`static boolean`	`isJava22()`
`static boolean`	`isJava6()` Better than (new VersionComparator()).compare(System.getProperty("java.version"), "1.6") >= 0 as it handles Android also, where java.version = "0".
`static boolean`	`isJava7()` Better than (new VersionComparator()).compare(System.getProperty("java.version"), "1.7") >= 0 as it handles Android also, where java.version = "0".
`static boolean`	`isJava8()`
`static boolean`	`isJava9()`
`static boolean`	`isLinuxService()`
`static boolean`	`isMac()`
`static boolean`	`isOpenJDK()`
`static boolean`	`isService()`
`static boolean`	`isSlow()` Our best guess on whether this is a slow architecture / OS / JVM, using some simple heuristics.
`static boolean`	`isWindows()`
`static boolean`	`isWindowsService()`
`static boolean`	`isX86()`
`static boolean`	`isZeroVM()` Is this a very slow interpreted mode VM?
`static void`	`main(String[] args)`
`static int`	`usableCores()` calculate how many (virtual) cores should be actually used by a thread pool

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - DAEMON_USER
```
public static final String DAEMON_USER
```
    See Also:
    
    Constant Field Values
  - DEFAULT_OVERRIDE_IS_SLOW
```
public static final boolean DEFAULT_OVERRIDE_IS_SLOW
```
    See Also:
    
    Constant Field Values
  - GENTOO_USER
```
public static final String GENTOO_USER
```
    See Also:
    
    Constant Field Values
  - PROP_OVERRIDE_IS_SLOW
```
public static final String PROP_OVERRIDE_IS_SLOW
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - SystemVersion
```
public SystemVersion()
```
- Method Detail
  - getActiveThreads
```
public static int getActiveThreads()
```
    Returns the current number of active (live) threads in the JVM. This includes both daemon and non-daemon threads.
    
    Returns:
    
    the estimated number of active threads, or 0 if context or stat manager is unavailable
  - getAndroidVersion
```
public static int getAndroidVersion()
```
    Identical to android.os.Build.VERSION.SDK_INT. For use outside of Android code.
    
    Returns:
    
    The SDK (API) version, e.g. 8 for Froyo, 0 if unknown
  - getArch
```
public static String getArch()
```
    returns the architecture of the system running I2P as a string for reference in clients.config and plugin.config files. matches the conventions of the Go cross compiler
    
    Returns:
    
    the architecture of the system running I2P as a string
  - getCores
```
public static int getCores()
```
    Runtime.getRuntime().availableProcssors()
    
    Returns:
    
    never smaller than 1
  - getCPULoad
```
public static int getCPULoad()
```
    Retrieve CPU Load of the JVM.
  - getCPULoadAvg
```
public static int getCPULoadAvg()
```
    Retrieve CPU Load Average of the JVM.
  - getMaxMemory
```
public static long getMaxMemory()
```
    Runtime.getRuntime().maxMemory() but check for bogus values
  - getOS
```
public static String getOS()
```
    returns the OS of the system running I2P as a lower-case string for reference in clients.config and plugin.config files. matches the conventions of the Go cross compiler
    
    Returns:
    
    the OS of the system running I2P as a lower-case string
  - getSystemLoad
```
public static int getSystemLoad()
```
    Retrieve System Load as percentage (100% equals full system load)
  - getSystemTimeZone
```
public static TimeZone getSystemTimeZone()
```
    The system's time zone, which is probably different from the JVM time zone, because Router changes the JVM default to GMT. It saves the old default in the context properties where we can get it. Use this to format a time in local time zone with DateFormat.setTimeZone().
    
    Returns:
    
    non-null
  - getSystemTimeZone
```
public static TimeZone getSystemTimeZone(I2PAppContext ctx)
```
    The system's time zone, which is probably different from the JVM time zone, because Router changes the JVM default to GMT. It saves the old default in the context properties where we can get it. Use this to format a time in local time zone with DateFormat.setTimeZone().
    
    Returns:
    
    non-null
  - getTunnelBuildSuccess
```
public static int getTunnelBuildSuccess()
```
    Retrieve Tunnel build success as a percentage.
  - hasWrapper
```
public static boolean hasWrapper()
```
    Is the wrapper present? Same as I2PAppContext.hasWrapper()
  - is64Bit
```
public static boolean is64Bit()
```
    This isn't always correct. http://stackoverflow.com/questions/807263/how-do-i-detect-which-kind-of-jre-is-installed-32bit-vs-64bit http://mark.koli.ch/2009/10/javas-osarch-system-property-is-the-bitness-of-the-jre-not-the-operating-system.html http://mark.koli.ch/2009/10/reliably-checking-os-bitness-32-or-64-bit-on-windows-with-a-tiny-c-app.html sun.arch.data.model not on all JVMs sun.arch.data.model == 64 => 64 bit processor sun.arch.data.model == 32 => A 32 bit JVM but could be either 32 or 64 bit processor or libs os.arch contains "64" could be 32 or 64 bit libs
  - isAndroid
```
public static boolean isAndroid()
```
  - isApache
```
public static boolean isApache()
```
    Apache Harmony JVM, or Android
  - isARM
```
public static boolean isARM()
```
  - isGentoo
```
public static boolean isGentoo()
```
  - isGNU
```
public static boolean isGNU()
```
    gij or JamVM with GNU Classpath
  - isJava
```
public static boolean isJava(int minVersion)
```
    Handles Android also
    
    Parameters:
    
    minVersion - e.g. 11
    
    Returns:
    
    true if greater than or equal to minVersion
  - isJava
```
public static boolean isJava(String minVersion)
```
    Handles Android, and minVersions in both forms (e.g. 11 or 1.11)
    
    Parameters:
    
    minVersion - either 1.x or x form works
    
    Returns:
    
    true if greater than or equal to minVersion
  - isJava10
```
public static boolean isJava10()
```
    Returns:
    
    true if Java 10 or higher, false for Android.
  - isJava11
```
public static boolean isJava11()
```
    Returns:
    
    true if Java 11 or higher, false for Android.
  - isJava12
```
public static boolean isJava12()
```
    Returns:
    
    true if Java 12 or higher, false for Android.
  - isJava13
```
public static boolean isJava13()
```
    Returns:
    
    true if Java 13 or higher, false for Android.
  - isJava14
```
public static boolean isJava14()
```
    Returns:
    
    true if Java 14 or higher, false for Android.
  - isJava15
```
public static boolean isJava15()
```
    Returns:
    
    true if Java 15 or higher, false for Android.
  - isJava16
```
public static boolean isJava16()
```
    Returns:
    
    true if Java 16 or higher, false for Android.
  - isJava17
```
public static boolean isJava17()
```
    Returns:
    
    true if Java 17 or higher, false for Android.
  - isJava18
```
public static boolean isJava18()
```
    Returns:
    
    true if Java 18 or higher, false for Android.
  - isJava19
```
public static boolean isJava19()
```
    Returns:
    
    true if Java 19 or higher, false for Android.
  - isJava20
```
public static boolean isJava20()
```
    Returns:
    
    true if Java 20 or higher, false for Android.
  - isJava21
```
public static boolean isJava21()
```
    Returns:
    
    true if Java 21 or higher, false for Android.
  - isJava22
```
public static boolean isJava22()
```
    Returns:
    
    true if Java 21 or higher, false for Android.
  - isJava6
```
public static boolean isJava6()
```
    Better than (new VersionComparator()).compare(System.getProperty("java.version"), "1.6") >= 0 as it handles Android also, where java.version = "0".
    
    Returns:
    
    true if Java 1.6 or higher, or Android API 9 or higher
  - isJava7
```
public static boolean isJava7()
```
    Better than (new VersionComparator()).compare(System.getProperty("java.version"), "1.7") >= 0 as it handles Android also, where java.version = "0".
    
    Returns:
    
    true if Java 1.7 or higher, or Android API 19 or higher
  - isJava8
```
public static boolean isJava8()
```
    Returns:
    
    true if Java 1.8 or higher, false for Android.
  - isJava9
```
public static boolean isJava9()
```
    Returns:
    
    true if Java 9 or higher, false for Android.
  - isLinuxService
```
public static boolean isLinuxService()
```
  - isMac
```
public static boolean isMac()
```
  - isOpenJDK
```
public static boolean isOpenJDK()
```
  - isService
```
public static boolean isService()
```
  - isSlow
```
public static boolean isSlow()
```
    Our best guess on whether this is a slow architecture / OS / JVM, using some simple heuristics.
  - isWindows
```
public static boolean isWindows()
```
  - isWindowsService
```
public static boolean isWindowsService()
```
  - isX86
```
public static boolean isX86()
```
  - isZeroVM
```
public static boolean isZeroVM()
```
    Is this a very slow interpreted mode VM?
  - main
```
public static void main(String[] args)
```
  - usableCores
```
public static int usableCores()
```
    calculate how many (virtual) cores should be actually used by a thread pool

Class SystemVersion

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DAEMON_USER

DEFAULT_OVERRIDE_IS_SLOW

GENTOO_USER

PROP_OVERRIDE_IS_SLOW

Constructor Detail

SystemVersion

Method Detail

getActiveThreads

getAndroidVersion

getArch

getCores

getCPULoad

getCPULoadAvg

getMaxMemory

getOS

getSystemLoad

getSystemTimeZone

getSystemTimeZone

getTunnelBuildSuccess

hasWrapper

is64Bit

isAndroid

isApache

isARM

isGentoo

isGNU

isJava

isJava

isJava10

isJava11

isJava12

isJava13

isJava14

isJava15

isJava16

isJava17

isJava18

isJava19

isJava20

isJava21

isJava22

isJava6

isJava7

isJava8

isJava9

isLinuxService

isMac

isOpenJDK

isService

isSlow

isWindows

isWindowsService

isX86

isZeroVM

main

usableCores