Class ThreadLocalRandom

java.lang.Object
java.util.Random
com.codahale.metrics.ThreadLocalRandom
All Implemented Interfaces:
Serializable, RandomGenerator

class ThreadLocalRandom extends Random
Copied directly from the JSR-166 project.
  • Field Details

    • multiplier

      private static final long multiplier
      See Also:
    • addend

      private static final long addend
      See Also:
    • mask

      private static final long mask
      See Also:
    • rnd

      private long rnd
      The random seed. We can't use super.seed.
    • initialized

      boolean initialized
      Initialization flag to permit calls to setSeed to succeed only while executing the Random constructor. We can't allow others since it would cause setting seed in one part of a program to unintentionally impact other usages by the thread.
    • pad0

      private long pad0
    • pad1

      private long pad1
    • pad2

      private long pad2
    • pad3

      private long pad3
    • pad4

      private long pad4
    • pad5

      private long pad5
    • pad6

      private long pad6
    • pad7

      private long pad7
    • localRandom

      private static final ThreadLocal<ThreadLocalRandom> localRandom
      The actual ThreadLocal
    • serialVersionUID

      private static final long serialVersionUID
      See Also:
  • Constructor Details

    • ThreadLocalRandom

      ThreadLocalRandom()
      Constructor called only by localRandom.initialValue.
  • Method Details

    • current

      public static ThreadLocalRandom current()
      Returns the current thread's ThreadLocalRandom.
      Returns:
      the current thread's ThreadLocalRandom
    • setSeed

      public void setSeed(long seed)
      Throws UnsupportedOperationException. Setting seeds in this generator is not supported.
      Overrides:
      setSeed in class Random
      Throws:
      UnsupportedOperationException - always
    • next

      protected int next(int bits)
      Overrides:
      next in class Random
    • nextInt

      public int nextInt(int least, int bound)
      Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
      Parameters:
      least - the least value returned
      bound - the upper bound (exclusive)
      Returns:
      the next value
      Throws:
      IllegalArgumentException - if least greater than or equal to bound
    • nextLong

      public long nextLong(long n)
      Returns a pseudorandom, uniformly distributed value between 0 (inclusive) and the specified value (exclusive).
      Parameters:
      n - the bound on the random number to be returned. Must be positive.
      Returns:
      the next value
      Throws:
      IllegalArgumentException - if n is not positive
    • nextLong

      public long nextLong(long least, long bound)
      Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
      Parameters:
      least - the least value returned
      bound - the upper bound (exclusive)
      Returns:
      the next value
      Throws:
      IllegalArgumentException - if least greater than or equal to bound
    • nextDouble

      public double nextDouble(double n)
      Returns a pseudorandom, uniformly distributed double value between 0 (inclusive) and the specified value (exclusive).
      Parameters:
      n - the bound on the random number to be returned. Must be positive.
      Returns:
      the next value
      Throws:
      IllegalArgumentException - if n is not positive
    • nextDouble

      public double nextDouble(double least, double bound)
      Returns a pseudorandom, uniformly distributed value between the given least value (inclusive) and bound (exclusive).
      Parameters:
      least - the least value returned
      bound - the upper bound (exclusive)
      Returns:
      the next value
      Throws:
      IllegalArgumentException - if least greater than or equal to bound