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46 lines
1.0 KiB
Go
46 lines
1.0 KiB
Go
package mathx
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import (
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"math/rand"
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"sync"
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"time"
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)
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// A Unstable is used to generate random value around the mean value base on given deviation.
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type Unstable struct {
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deviation float64
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r *rand.Rand
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lock *sync.Mutex
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}
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// NewUnstable returns a Unstable.
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func NewUnstable(deviation float64) Unstable {
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if deviation < 0 {
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deviation = 0
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}
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if deviation > 1 {
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deviation = 1
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}
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return Unstable{
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deviation: deviation,
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r: rand.New(rand.NewSource(time.Now().UnixNano())),
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lock: new(sync.Mutex),
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}
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}
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// AroundDuration returns a random duration with given base and deviation.
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func (u Unstable) AroundDuration(base time.Duration) time.Duration {
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u.lock.Lock()
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val := time.Duration((1 + u.deviation - 2*u.deviation*u.r.Float64()) * float64(base))
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u.lock.Unlock()
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return val
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}
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// AroundInt returns a randome int64 with given base and deviation.
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func (u Unstable) AroundInt(base int64) int64 {
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u.lock.Lock()
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val := int64((1 + u.deviation - 2*u.deviation*u.r.Float64()) * float64(base))
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u.lock.Unlock()
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return val
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}
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