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timermanager.go
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timermanager.go
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package timermanager
import (
"sync"
"time"
)
type TimerManager struct {
timers map[*Timer]struct{}
lock sync.Mutex
}
var (
// Pointer to singleton object
_timerManager *TimerManager
// Lock for singleton object
_timerManagerInitLock sync.Mutex
)
// InitTimerManager explicitly initialize global TimerManager instance, which
// should be invoked before all timer creation behaviors.
func InitTimerManager() error {
if _timerManager == nil {
_timerManagerInitLock.Lock()
defer _timerManagerInitLock.Unlock()
if _timerManager == nil {
_timerManager = &TimerManager{timers: make(map[*Timer]struct{})}
}
}
return nil
}
// GetTimerManager just returns pointer to global TimerManager instance. Do not
// forget to check whether it is nil before using.
func GetTimerManager() *TimerManager {
return _timerManager
}
func (m *TimerManager) Start() {
// TimerManager should be the centralized manager for scheduled jobs, but
// needs better design
return
}
func (m *TimerManager) Stop() {
for t := range m.timers {
t.Stop()
}
m.lock.Lock()
defer m.lock.Unlock()
for t := range m.timers {
delete(m.timers, t)
}
}
func (m *TimerManager) CreateCronTimer(callback TimerCallback, cronat string) (*Timer, error) {
s, err := NewCronScheduled(cronat)
if err != nil {
return nil, err
}
t := NewTimer(s, callback)
m.lock.Lock()
defer m.lock.Unlock()
m.timers[t] = struct{}{}
return t, nil
}
func (m *TimerManager) CreateRateTimer(callback TimerCallback, cronat string, creationTime time.Time) (*Timer, error) {
s, err := NewRateScheduled(cronat, creationTime)
if err != nil {
return nil, err
}
t := NewTimer(s, callback)
m.lock.Lock()
defer m.lock.Unlock()
m.timers[t] = struct{}{}
return t, nil
}
func (m *TimerManager) CreateAtTimer(callback TimerCallback, cronat string) (*Timer, error) {
s, err := NewAtScheduled(cronat)
if err != nil {
return nil, err
}
t := NewTimer(s, callback)
m.lock.Lock()
defer m.lock.Unlock()
m.timers[t] = struct{}{}
return t, nil
}
// CreateTimerInSeconds returns new registered timer in precision of seconds
func (m *TimerManager) CreateTimerInSeconds(callback TimerCallback, seconds int) (*Timer, error) {
return m.CreateTimerInNanoseconds(callback, time.Duration(seconds) * time.Second)
}
// CreateTimerInNanoseconds returns new registered timer in precision of nanoseconds
func (m *TimerManager) CreateTimerInNanoseconds(callback TimerCallback, interval time.Duration) (*Timer, error) {
s := NewMutableScheduled(interval)
t := NewTimer(s, callback)
m.lock.Lock()
defer m.lock.Unlock()
m.timers[t] = struct{}{}
return t, nil
}
func (m *TimerManager) DeleteTimer(t *Timer) {
t.Stop()
m.lock.Lock()
defer m.lock.Unlock()
delete(m.timers, t)
}