Package org.apache.bookkeeper.common.util

Class MathUtils

java.lang.Object
org.apache.bookkeeper.common.util.MathUtils
public class MathUtils extends Object
Provides misc math functions that don't come standard.

  • Constructor Summary

    Constructors
    Constructor
    Description
    MathUtils()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static long
    elapsedMicroSec(long startNanoTime)
    Microseconds elapsed since the time specified, the input is nanoTime the only conversion happens when computing the elapsed time.
    static long
    elapsedMSec(long startNanoTime)
    Milliseconds elapsed since the time specified, the input is nanoTime the only conversion happens when computing the elapsed time.
    static long
    elapsedNanos(long startNanoTime)
    Nanoseconds elapsed since the time specified, the input is nanoTime the only conversion happens when computing the elapsed time.
    static int
    findNextPositivePowerOfTwo(int value)
     
    static long
    nowInNano()
    Current time from some arbitrary time base in the past, counting in nanoseconds, and not affected by settimeofday or similar system clock changes.
    static int
    signSafeMod(long dividend, int divisor)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • MathUtils

      public MathUtils()

  • Method Details

    • signSafeMod

      public static int signSafeMod(long dividend, int divisor)

    • findNextPositivePowerOfTwo

      public static int findNextPositivePowerOfTwo(int value)

    • nowInNano

      public static long nowInNano()
      Current time from some arbitrary time base in the past, counting in nanoseconds, and not affected by settimeofday or similar system clock changes. This is appropriate to use when computing how much longer to wait for an interval to expire.

      NOTE: only use it for measuring. http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/System.html#nanoTime%28%29

      Returns:
      current time in nanoseconds.

    • elapsedMSec

      public static long elapsedMSec(long startNanoTime)
      Milliseconds elapsed since the time specified, the input is nanoTime the only conversion happens when computing the elapsed time.
      Parameters:
      startNanoTime - the start of the interval that we are measuring
      Returns:
      elapsed time in milliseconds.

    • elapsedMicroSec

      public static long elapsedMicroSec(long startNanoTime)
      Microseconds elapsed since the time specified, the input is nanoTime the only conversion happens when computing the elapsed time.
      Parameters:
      startNanoTime - the start of the interval that we are measuring
      Returns:
      elapsed time in microseconds.

    • elapsedNanos

      public static long elapsedNanos(long startNanoTime)
      Nanoseconds elapsed since the time specified, the input is nanoTime the only conversion happens when computing the elapsed time.
      Parameters:
      startNanoTime - the start of the interval that we are measuring
      Returns:
      elapsed time in nanoseconds.