net.openhft.chronicle.core

Enum Jvm

java.lang.Object

java.lang.Enum<Jvm>

net.openhft.chronicle.core.Jvm

All Implemented Interfaces:

Serializable, Comparable<Jvm>

public enum Jvm
extends Enum<Jvm>

Utility class to access information in the JVM.

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	IS_DEBUG

Method Summary

Modifier and Type	Method and Description
static void	busyWaitMicros(long micros) This method is designed tobe used when the time to be waited is very small, typically under a millisecond.
static Field	getField(Class clazz, String name) Get the Field for a class by name.
static <V> V	getValue(Object obj, String name)
static boolean	isDebug()
static String	lockWithStack(ReentrantLock lock) Log the stack trace of the thread holding a lock.
static void	pause(long millis) Silently pause for milli seconds.
static <T extends Throwable> RuntimeException	rethrow(Throwable throwable) Cast a CheckedException as an unchecked one.
static int	trimLast(int first, StackTraceElement[] stes)
static void	trimStackTrace(StringBuilder sb, StackTraceElement... stes) Append the StackTraceElements to the StringBuilder trimming some internal methods.
static Jvm	valueOf(String name) Returns the enum constant of this type with the specified name.
static Jvm[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Field Detail

IS_DEBUG

public static final boolean IS_DEBUG

Method Detail

values

public static Jvm[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (Jvm c : Jvm.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static Jvm valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

rethrow

public static <T extends Throwable> RuntimeException rethrow(Throwable throwable)
                                                      throws T extends Throwable

Cast a CheckedException as an unchecked one.

Type Parameters:

T - the type of the Throwable

Parameters:

throwable - to cast

Returns:

this method will never return a Throwable instance, it will just throw it.

Throws:

T - the throwable as an unchecked throwable

T extends Throwable

trimStackTrace

public static void trimStackTrace(StringBuilder sb,
                                  StackTraceElement... stes)

Append the StackTraceElements to the StringBuilder trimming some internal methods.

Parameters:

sb - to append to

stes - stack trace elements

trimLast

public static int trimLast(int first,
                           StackTraceElement[] stes)

isDebug

public static boolean isDebug()

Returns:

is the JVM in debug mode.

pause

public static void pause(long millis)

Silently pause for milli seconds.

Parameters:

millis - to sleep for.

busyWaitMicros

public static void busyWaitMicros(long micros)

This method is designed tobe used when the time to be waited is very small, typically under a millisecond.

Parameters:

micros - Time in micros

getField

public static Field getField(Class clazz,
                             String name)

Get the Field for a class by name.

Parameters:

clazz - to get the field for

name - of the field

Returns:

the Field.

getValue

public static <V> V getValue(Object obj,
                             String name)

lockWithStack

public static String lockWithStack(ReentrantLock lock)

Log the stack trace of the thread holding a lock.

Parameters:

lock - to log

Returns:

the lock.toString plus a stack trace.