Package org.openjdk.jmh.util

Class Utils

java.lang.Object

org.openjdk.jmh.util.Utils

public class Utils
extends Object

Method Summary

Modifier and Type	Method	Description
static <T> Iterable<T>	adaptForLoop(Iterator<T> it)	Adapts Iterator for Iterable.
static void	check(Class<?> klass, String fieldName)
static void	check(Class<?> klass, String... fieldNames)
static String[]	concat(String[] t1, String[] t2)
static int	figureOutHotCPUs()	Warm up the CPU schedulers, bring all the CPUs online to get the reasonable estimate of the system capacity.
static String	getCurrentJvm()
static String	getCurrentJvmVersion()
static String	getCurrentOSVersion()
static long	getOffset(Class<?> klass, String fieldName)
static long	getPid()	Gets PID of the current JVM.
static long	getPid(Process process)	Gets the PID of the target process.
static Properties	getRecordedSystemProperties()	We don't access the complete system properties via System.getProperties() because this would require read/write permissions to the properties.
static Charset	guessConsoleEncoding()
static boolean	isWindows()
static String	join(String[] src, String delim)
static String	join(Collection<String> src, String delim)
static String	marshalIntArray(int[] arr)
static <T extends Comparable<T>> T	max(Collection<T> ts)
static <T extends Comparable<T>> T	min(Collection<T> ts)
static Properties	readPropertiesFromCommand(List<String> cmd)
static void	reflow(PrintWriter pw, String src, int width, int indent)
static Collection<String>	rewrap(String lines)
static int	roundUp(int v, int quant)
static Process	runAsync(String... cmd)
static Collection<String>	runWith(List<String> cmd)
static Collection<String>	splitQuotedEscape(String src)
static int	sum(int[] arr)
static String	throwableToString(Throwable t)
static Collection<String>	tryWith(String... cmd)
static int[]	unmarshalIntArray(String src)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

min

public static <T extends Comparable<T>> T min(Collection<T> ts)

max

public static <T extends Comparable<T>> T max(Collection<T> ts)

concat

public static String[] concat(String[] t1,
                              String[] t2)

join

public static String join(Collection<String> src,
                          String delim)

join

public static String join(String[] src,
                          String delim)

splitQuotedEscape

public static Collection<String> splitQuotedEscape(String src)

sum

public static int sum(int[] arr)

roundUp

public static int roundUp(int v,
                          int quant)

throwableToString

public static String throwableToString(Throwable t)

unmarshalIntArray

public static int[] unmarshalIntArray(String src)

marshalIntArray

public static String marshalIntArray(int[] arr)

figureOutHotCPUs

public static int figureOutHotCPUs()

Warm up the CPU schedulers, bring all the CPUs online to get the reasonable estimate of the system capacity. Some systems, notably embedded Linuxes, power down the idle CPUs and so availableProcessors() may report lower CPU count than would be present after the load-up.

Returns:

max CPU count

guessConsoleEncoding

public static Charset guessConsoleEncoding()

reflow

public static void reflow(PrintWriter pw,
                          String src,
                          int width,
                          int indent)

rewrap

public static Collection<String> rewrap(String lines)

check

public static void check(Class<?> klass,
                         String... fieldNames)

check

public static void check(Class<?> klass,
                         String fieldName)

getOffset

public static long getOffset(Class<?> klass,
                             String fieldName)

isWindows

public static boolean isWindows()

getCurrentJvm

public static String getCurrentJvm()

getCurrentJvmVersion

public static String getCurrentJvmVersion()

getCurrentOSVersion

public static String getCurrentOSVersion()

getPid

public static long getPid()

Gets PID of the current JVM.

Returns:

PID.

getPid

public static long getPid(Process process)

Gets the PID of the target process.

Parameters:

process - to poll

Returns:

PID, or zero if no PID is found

tryWith

public static Collection<String> tryWith(String... cmd)

runAsync

public static Process runAsync(String... cmd)

runWith

public static Collection<String> runWith(List<String> cmd)

getRecordedSystemProperties

public static Properties getRecordedSystemProperties()

We don't access the complete system properties via System.getProperties() because this would require read/write permissions to the properties. Just copy the properties we want to record in the result.

Returns:

Copy of system properties we want to record in the results.

readPropertiesFromCommand

public static Properties readPropertiesFromCommand(List<String> cmd)

adaptForLoop

public static <T> Iterable<T> adaptForLoop(Iterator<T> it)

Adapts Iterator for Iterable. Can be iterated only once!

Type Parameters:

T - element type

Parameters:

it - iterator

Returns:

iterable for given iterator