/
trigger.go
64 lines (54 loc) · 1.38 KB
/
trigger.go
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package pprofs
import (
"math/rand"
"time"
)
// Trigger is an abstraction of a trigger.
type Trigger interface {
// Wait should block until need trigger capturing profile,
// returning error means skipping.
Wait() error
}
// IntervalTrigger will trigger periodically with constant interval.
type IntervalTrigger struct {
started bool
interval time.Duration
}
// NewIntervalTrigger returns a IntervalTrigger.
func NewIntervalTrigger(interval time.Duration) *IntervalTrigger {
return &IntervalTrigger{
interval: interval,
}
}
// Wait implements Trigger.
func (t *IntervalTrigger) Wait() error {
if !t.started {
t.started = true
return nil // trigger it at the beginning
}
time.Sleep(t.interval)
return nil
}
// RandomIntervalTrigger will trigger periodically with random interval.
type RandomIntervalTrigger struct {
random *rand.Rand
started bool
min, max time.Duration
}
// NewRandomIntervalTrigger returns a IntervalTrigger.
func NewRandomIntervalTrigger(min, max time.Duration) *RandomIntervalTrigger {
return &RandomIntervalTrigger{
random: rand.New(rand.NewSource(time.Now().UnixNano())),
min: min,
max: max,
}
}
// Wait implements Trigger.
func (t *RandomIntervalTrigger) Wait() error {
if !t.started {
t.started = true
return nil // trigger it at the beginning
}
time.Sleep(t.min + time.Duration(t.random.Int63n(int64(t.max-t.min))))
return nil
}