Class NormalDistStats

java.lang.Object
org.apache.storm.loadgen.NormalDistStats
All Implemented Interfaces:
Serializable

public class NormalDistStats extends Object implements Serializable
Stats related to something with a normal distribution, and a way to randomly simulate it.
See Also:
  • Field Details

    • mean

      public final double mean
    • stddev

      public final double stddev
    • min

      public final double min
    • max

      public final double max
  • Constructor Details

    • NormalDistStats

      public NormalDistStats(List<Double> values)
      Create an instance of this from a list of values. The metrics will be computed from the values.
      Parameters:
      values - the values to compute metrics from.
    • NormalDistStats

      public NormalDistStats(double mean, double stddev, double min, double max)
      A Constructor for the pre computed stats.
      Parameters:
      mean - the mean of the values.
      stddev - the standard deviation of the values.
      min - the min of the values.
      max - the max of the values.
  • Method Details

    • fromConf

      public static NormalDistStats fromConf(Map<String,Object> conf)
      Read the stats from a config.
      Parameters:
      conf - the config.
      Returns:
      the corresponding stats.
    • fromConf

      public static NormalDistStats fromConf(Map<String,Object> conf, Double def)
      Read the stats from a config.
      Parameters:
      conf - the config.
      def - the default mean.
      Returns:
      the corresponding stats.
    • toConf

      public Map<String,Object> toConf()
      Return this as a config.
      Returns:
      the config version of this.
    • nextRandom

      public double nextRandom(Random rand)
      Generate a random number that follows the statistical distribution.
      Parameters:
      rand - the random number generator to use
      Returns:
      the next number that should follow the statistical distribution.
    • toString

      public String toString()
      Overrides:
      toString in class Object
    • scaleBy

      public NormalDistStats scaleBy(double v)
      Scale the stats by v. This is not scaling everything proportionally. We don't want the stddev to increase so instead we scale the mean and shift everything up or down by the same amount.
      Parameters:
      v - the amount to scale by 1.0 is nothing 0.5 is half.
      Returns:
      a copy of this with the needed adjustments.