tachyon.util

Class CommonUtils

java.lang.Object

tachyon.util.CommonUtils

public final class CommonUtils
extends Object

Common utilities shared by all components in Tachyon.

Method Summary

Methods

Modifier and Type	Method and Description
static <T> T	createNewClassInstance(Class<T> cls, Class<?>[] ctorClassArgs, Object[] ctorArgs) Creates new instance of a class by calling a constructor that receives ctorClassArgs arguments.
static long	getCurrentMs()
static <T> String	listToString(List<T> list) Converts a list of objects to a string.
static void	sleepMs(org.slf4j.Logger logger, long timeMs) Sleeps for the given number of milliseconds, reporting interruptions using the given logger.
static void	sleepMs(org.slf4j.Logger logger, long timeMs, boolean shouldInterrupt) Sleeps for the given number of milliseconds, reporting interruptions using the given logger, and optionally pass the interruption to the caller.
static void	sleepMs(long timeMs) Sleeps for the given number of milliseconds.
static String[]	toStringArray(ArrayList<String> src) Parses ArrayList<String> into String[].
static void	warmUpLoop() Common empty loop utility that serves the purpose of warming up the JVM before performance microbenchmarks.

Methods inherited from class java.lang.Object

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

Method Detail

getCurrentMs

public static long getCurrentMs()

Returns:

current time in milliseconds

listToString

public static <T> String listToString(List<T> list)

Converts a list of objects to a string.

Type Parameters:

T - type of the objects

Parameters:

list - list of objects

Returns:

space-separated concatenation of the string representation returned by Object#toString of the individual objects

toStringArray

public static String[] toStringArray(ArrayList<String> src)

Parses ArrayList<String> into String[].

Parameters:

src - is the ArrayList of strings

Returns:

an array of strings

sleepMs

public static void sleepMs(long timeMs)

Sleeps for the given number of milliseconds.

Parameters:

timeMs - sleep duration in milliseconds

sleepMs

public static void sleepMs(org.slf4j.Logger logger,
           long timeMs)

Sleeps for the given number of milliseconds, reporting interruptions using the given logger.

Parameters:

logger - logger for reporting interruptions

timeMs - sleep duration in milliseconds

sleepMs

public static void sleepMs(org.slf4j.Logger logger,
           long timeMs,
           boolean shouldInterrupt)

Sleeps for the given number of milliseconds, reporting interruptions using the given logger, and optionally pass the interruption to the caller.

Parameters:

logger - logger for reporting interruptions

timeMs - sleep duration in milliseconds

shouldInterrupt - determines if interruption should be passed to the caller

warmUpLoop

public static void warmUpLoop()

Common empty loop utility that serves the purpose of warming up the JVM before performance microbenchmarks.

createNewClassInstance

public static <T> T createNewClassInstance(Class<T> cls,
                           Class<?>[] ctorClassArgs,
                           Object[] ctorArgs)
                                throws InstantiationException,
                                       IllegalAccessException,
                                       NoSuchMethodException,
                                       SecurityException,
                                       InvocationTargetException

Creates new instance of a class by calling a constructor that receives ctorClassArgs arguments.

Parameters:

cls - the class to create

ctorClassArgs - parameters type list of the constructor to initiate, if null default constructor will be called

ctorArgs - the arguments to pass the constructor

Returns:

new class object or null if not successful

Throws:

InstantiationException - if the instantiation fails

IllegalAccessException - if the constructor cannot be accessed

NoSuchMethodException - if the constructor does not exist

SecurityException - if security violation has occurred

InvocationTargetException - if the constructor invocation results in an exception