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frozen.go
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frozen.go
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package clock
import (
"errors"
"sync"
"time"
)
type frozenTime struct {
mu sync.Mutex
now time.Time
timers []*frozenTimer
waiter *waiter
}
type waiter struct {
count int
signalCh chan struct{}
}
func (ft *frozenTime) Now() time.Time {
ft.mu.Lock()
defer ft.mu.Unlock()
return ft.now
}
func (ft *frozenTime) Sleep(d time.Duration) {
<-ft.NewTimer(d).C()
}
func (ft *frozenTime) After(d time.Duration) <-chan time.Time {
return ft.NewTimer(d).C()
}
func (ft *frozenTime) NewTimer(d time.Duration) Timer {
return ft.AfterFunc(d, nil)
}
func (ft *frozenTime) AfterFunc(d time.Duration, f func()) Timer {
t := &frozenTimer{
ft: ft,
when: ft.Now().Add(d),
f: f,
}
if f == nil {
t.c = make(chan time.Time, 1)
}
ft.startTimer(t)
return t
}
func (ft *frozenTime) advance(d time.Duration) {
ft.mu.Lock()
defer ft.mu.Unlock()
ft.now = ft.now.Add(d)
for t := ft.nextExpired(); t != nil; t = ft.nextExpired() {
// Send the timer expiration time to the timer channel if it is
// defined. But make sure not to block on the send if the channel is
// full. This behavior will make a ticker skip beats if it readers are
// not fast enough.
if t.c != nil {
select {
case t.c <- t.when:
default:
}
}
// If it is a ticking timer then schedule next tick, otherwise mark it
// as stopped.
if t.interval != 0 {
t.when = t.when.Add(t.interval)
t.stopped = false
ft.unlockedStartTimer(t)
}
// If a function is associated with the timer then call it, but make
// sure to release the lock for the time of call it is necessary
// because the lock is not re-entrant but the function may need to
// start another timer or ticker.
if t.f != nil {
func() {
ft.mu.Unlock()
defer ft.mu.Lock()
t.f()
}()
}
}
}
func (ft *frozenTime) stopTimer(t *frozenTimer) bool {
ft.mu.Lock()
defer ft.mu.Unlock()
if t.stopped {
return false
}
for i, curr := range ft.timers {
if curr == t {
t.stopped = true
copy(ft.timers[i:], ft.timers[i+1:])
lastIdx := len(ft.timers) - 1
ft.timers[lastIdx] = nil
ft.timers = ft.timers[:lastIdx]
return true
}
}
return false
}
func (ft *frozenTime) nextExpired() *frozenTimer {
if len(ft.timers) == 0 {
return nil
}
t := ft.timers[0]
if ft.now.Before(t.when) {
return nil
}
copy(ft.timers, ft.timers[1:])
lastIdx := len(ft.timers) - 1
ft.timers[lastIdx] = nil
ft.timers = ft.timers[:lastIdx]
t.stopped = true
return t
}
func (ft *frozenTime) startTimer(t *frozenTimer) {
ft.mu.Lock()
defer ft.mu.Unlock()
ft.unlockedStartTimer(t)
if ft.waiter == nil {
return
}
if len(ft.timers) >= ft.waiter.count {
close(ft.waiter.signalCh)
}
}
func (ft *frozenTime) unlockedStartTimer(t *frozenTimer) {
pos := 0
for _, curr := range ft.timers {
if t.when.Before(curr.when) {
break
}
pos++
}
ft.timers = append(ft.timers, nil)
copy(ft.timers[pos+1:], ft.timers[pos:])
ft.timers[pos] = t
}
type frozenTimer struct {
ft *frozenTime
when time.Time
interval time.Duration
stopped bool
c chan time.Time
f func()
}
func (t *frozenTimer) C() <-chan time.Time {
return t.c
}
func (t *frozenTimer) Stop() bool {
return t.ft.stopTimer(t)
}
func (t *frozenTimer) Reset(d time.Duration) bool {
active := t.ft.stopTimer(t)
t.when = t.ft.Now().Add(d)
t.ft.startTimer(t)
return active
}
type frozenTicker struct {
t *frozenTimer
}
func (t *frozenTicker) C() <-chan time.Time {
return t.t.C()
}
func (t *frozenTicker) Stop() {
t.t.Stop()
}
func (ft *frozenTime) NewTicker(d time.Duration) Ticker {
if d <= 0 {
panic(errors.New("non-positive interval for NewTicker"))
}
t := &frozenTimer{
ft: ft,
when: ft.Now().Add(d),
interval: d,
c: make(chan time.Time, 1),
}
ft.startTimer(t)
return &frozenTicker{t}
}
func (ft *frozenTime) Tick(d time.Duration) <-chan time.Time {
if d <= 0 {
return nil
}
return ft.NewTicker(d).C()
}
func (ft *frozenTime) Wait4Scheduled(count int, timeout time.Duration) bool {
ft.mu.Lock()
if len(ft.timers) >= count {
ft.mu.Unlock()
return true
}
if ft.waiter != nil {
panic("Concurrent call")
}
ft.waiter = &waiter{count, make(chan struct{})}
ft.mu.Unlock()
success := false
select {
case <-ft.waiter.signalCh:
success = true
case <-time.After(timeout):
}
ft.mu.Lock()
ft.waiter = nil
ft.mu.Unlock()
return success
}