go.charczuk.com@v0.0.0-20240327042549-bc490516bd1a/sdk/simutil/poisson_duration.go (about)

     1  /*
     2  
     3  Copyright (c) 2023 - Present. Will Charczuk. All rights reserved.
     4  Use of this source code is governed by a MIT license that can be found in the LICENSE file at the root of the repository.
     5  
     6  */
     7  
     8  package simutil
     9  
    10  import (
    11  	"math"
    12  	"math/rand"
    13  	"time"
    14  )
    15  
    16  // PoissonDuration returns a poisson distributed random duration value with
    17  // an average centered around the given lambda.
    18  func PoissonDuration(lambda time.Duration) time.Duration {
    19  	rv := rand.Float64()
    20  	rv = -math.Log(1.0 - rv)
    21  	return time.Duration(rv * float64(lambda))
    22  }