135 lines
2.1 KiB
Go
135 lines
2.1 KiB
Go
package main
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import (
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"log"
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"sync"
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"time"
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)
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type DistEvent interface {
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GetId() int64
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GetDate() *time.Time
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}
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// distList maintain a nextSettingsFile list up-to-date.
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type distList struct {
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List []DistEvent
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Lock sync.RWMutex
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Timer *time.Timer
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}
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func (l *distList) TimerNextEvent() *time.Timer {
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l.Lock.RLock()
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defer l.Lock.RUnlock()
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var min *time.Time
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for _, f := range l.List {
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if min == nil || f.GetDate().Before(*min) {
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min = f.GetDate()
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}
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}
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if min == nil {
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return nil
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}
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return time.NewTimer(time.Until(*min))
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}
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func (l *distList) AddEvent(nsf DistEvent, firstItemChanged func(DistEvent)) {
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l.Lock.Lock()
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istop := len(l.List)
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for i, n := range l.List {
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if n.GetId() == nsf.GetId() {
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l.Lock.Unlock()
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return
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} else if n.GetDate().After(*nsf.GetDate()) {
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istop = i
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break
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}
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}
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l.List = append(l.List, nsf)
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copy(l.List[istop+1:], l.List[istop:])
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l.List[istop] = nsf
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l.Lock.Unlock()
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if istop == 0 {
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l.ResetTimer()
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if firstItemChanged != nil {
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firstItemChanged(nsf)
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}
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}
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}
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func (l *distList) DelEvent(id int64, firstItemChanged func(DistEvent)) {
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l.Lock.Lock()
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istop := len(l.List)
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for i, n := range l.List {
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if n.GetId() == id {
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istop = i
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break
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}
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}
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if istop == len(l.List)-1 {
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l.List = l.List[:istop]
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} else if istop != len(l.List) {
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l.List = append(l.List[:istop], l.List[istop+1:]...)
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}
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l.Lock.Unlock()
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if istop == 0 {
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l.ResetTimer()
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if firstItemChanged != nil {
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if len(l.List) == 0 {
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firstItemChanged(nil)
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} else {
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firstItemChanged(l.List[0])
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}
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}
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}
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}
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func (l *distList) ResetTimer() {
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l.Lock.RLock()
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defer l.Lock.RUnlock()
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if len(l.List) == 0 {
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l.Timer.Reset(time.Minute)
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} else {
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l.Timer.Reset(time.Until(*l.List[0].GetDate()))
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}
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}
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func (l *distList) Pop() DistEvent {
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l.Lock.Lock()
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defer l.Lock.Unlock()
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if len(l.List) == 0 {
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return nil
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}
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if time.Now().Before(*l.List[0].GetDate()) {
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return nil
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}
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ret := l.List[0]
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l.List = l.List[1:]
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return ret
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}
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func (l *distList) Print() {
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l.Lock.RLock()
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defer l.Lock.RUnlock()
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for n, i := range l.List {
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log.Printf("#%d: %v", n, i)
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}
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}
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