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package sched
import (
"reflect"
"strconv"
"strings"
"sync/atomic"
"time"
"unsafe"
)
// Job encapsulates logic for a scheduled job to be run according
// to a set Timing, executing the job with a set panic handler, and
// holding onto a next execution time safely in a concurrent environment.
type Job struct {
id uint64
next atomic_time
timing Timing
call func(time.Time)
}
// NewJob returns a new Job to run given function.
func NewJob(fn func(now time.Time)) *Job {
if fn == nil {
// Ensure a function
panic("nil func")
}
j := &Job{ // set defaults
timing: emptytiming, // i.e. fire immediately
call: fn,
}
return j
}
// At sets this Job to execute at time, by passing
// (*sched.Once)(&at) to .With(). See .With() for details.
func (job *Job) At(at time.Time) *Job {
return job.With((*Once)(&at))
}
// Every sets this Job to execute every period, by passing
// sched.Period(period) to .With(). See .With() for details.
func (job *Job) Every(period time.Duration) *Job {
return job.With(Periodic(period))
}
// EveryAt sets this Job to execute every period starting at time, by passing
// &PeriodicAt{once: Once(at), period: Periodic(period)} to .With(). See .With() for details.
func (job *Job) EveryAt(at time.Time, period time.Duration) *Job {
return job.With(&PeriodicAt{Once: Once(at), Period: Periodic(period)})
}
// With sets this Job's timing to given implementation, or
// if already set will wrap existing using sched.TimingWrap{}.
func (job *Job) With(t Timing) *Job {
if t == nil {
// Ensure a timing
panic("nil Timing")
}
if job.id != 0 {
// Cannot update scheduled job
panic("job already scheduled")
}
if job.timing == emptytiming {
// Set new timing
job.timing = t
} else {
// Wrap old timing
old := job.timing
job.timing = &TimingWrap{
Outer: t,
Inner: old,
}
}
return job
}
// Next returns the next time this Job is expected to run.
func (job *Job) Next() time.Time {
return job.next.Load()
}
// Run will execute this Job and pass through given now time.
func (job *Job) Run(now time.Time) { job.call(now) }
// String provides a debuggable string representation
// of Job including ID, next time and Timing type.
func (job *Job) String() string {
var buf strings.Builder
buf.WriteByte('{')
buf.WriteString("id=")
buf.WriteString(strconv.FormatUint(job.id, 10))
buf.WriteByte(' ')
buf.WriteString("next=")
buf.WriteString(job.next.Load().Format(time.StampMicro))
buf.WriteByte(' ')
buf.WriteString("timing=")
buf.WriteString(reflect.TypeOf(job.timing).String())
buf.WriteByte('}')
return buf.String()
}
type atomic_time struct{ p unsafe.Pointer }
func (t *atomic_time) Load() time.Time {
if p := atomic.LoadPointer(&t.p); p != nil {
return *(*time.Time)(p)
}
return zerotime
}
func (t *atomic_time) Store(v time.Time) {
atomic.StorePointer(&t.p, unsafe.Pointer(&v))
}
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