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schedule.go
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schedule.go
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package cronjob
import (
"time"
)
// At returns a schedule that runs at: at (field).
func At(at time.Time) Schedule {
return &constantSchedule{
at: at,
}
}
// In returns a schedule that runs from now (field) in offset (field).
func In(now time.Time, offset time.Duration) Schedule {
if offset < time.Second {
offset = time.Second
}
return &constantSchedule{
at: now.Add(offset),
}
}
// Every runs from now: now (field) in constant increments of every (field).
func Every(every time.Duration) Schedule {
if every < time.Second {
every = time.Second
}
return &cyclicSchedule{
every: every,
}
}
// EveryFixed finds the next time interval: every (field) and runs it at the nearest interval.
//
// example:
// cronjob.EveryFixed(time.Hour * 3)
// the schedule will find the next 3 hour interval to run at.
//
// possible 3 hour intervals: 03:00, 06:00, 09:00, 12:00, 15:00, 18:00, 21:00, 24:00
func EveryFixed(every time.Duration) Schedule {
if every < time.Second {
every = time.Second
}
return &fixedCyclicSchedule{
every: every,
}
}
// ConstantSchedule ------------------------------------------------------------------
type constantSchedule struct {
// is the date on which the job is scheduled to run on.
at time.Time
}
// Calculate calculates the duration of time in which the schedule will be active
// in reference to now parameter.
func (s *constantSchedule) Calculate(now time.Time) time.Duration {
return s.at.Sub(now)
}
// FixedCyclicSchedule ------------------------------------------------------------------
type fixedCyclicSchedule struct {
every time.Duration
nextActivation time.Time
}
func (s *fixedCyclicSchedule) Calculate(now time.Time) time.Duration {
return s.nextActivation.Sub(now)
}
func (s *fixedCyclicSchedule) MoveNextAvtivation(now time.Time) {
s.nextActivation = s.calculateNextInterval(now)
}
func (s *fixedCyclicSchedule) calculateNextInterval(now time.Time) time.Time {
switch h, m, s := breakTime(int(s.every.Seconds())); {
case h > 0:
return time.Date(
now.Year(),
now.Month(),
now.Day(),
h*(now.Hour()/h+1),
m,
s,
0,
now.Location(),
)
case m > 0:
return time.Date(
now.Year(),
now.Month(),
now.Day(),
now.Hour(),
m*(now.Minute()/m+1),
s,
0,
now.Location(),
)
default:
return time.Date(
now.Year(),
now.Month(),
now.Day(),
now.Hour(),
now.Minute(),
s*(now.Second()/s+1),
0,
now.Location(),
)
}
}
func breakTime(secs int) (hour, minute, second int) {
hour = secs / 3600
secs = secs - hour*3600
minute = secs / 60
secs = secs - minute*60
second = secs
return
}
// CyclicSchedule ------------------------------------------------------------------
type cyclicSchedule struct {
// every gets added to the current time to get the next activation cycle.
every time.Duration
// nextActivation will hold the time of the next activation
nextActivation time.Time
}
func (s *cyclicSchedule) Calculate(now time.Time) time.Duration {
return s.nextActivation.Sub(now)
}
func (s *cyclicSchedule) MoveNextAvtivation(now time.Time) {
s.nextActivation = now.Add(s.every)
}