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|
package clock
import (
"sync"
"time"
)
type Ticker interface {
C() <-chan time.Time
Stop()
}
type Clock interface {
Now() time.Time
Sleep(time.Duration)
After(time.Duration) <-chan time.Time
NewTicker(time.Duration) Ticker
}
var Real Clock
func init() {
Real = realClock{}
}
type realClock struct{}
func (realClock) Now() time.Time {
return time.Now()
}
func (realClock) Sleep(d time.Duration) {
time.Sleep(d)
}
func (realClock) After(d time.Duration) <-chan time.Time {
return time.After(d)
}
func (realClock) NewTicker(d time.Duration) Ticker {
return realTicker{time.NewTicker(d)}
}
type realTicker struct {
*time.Ticker
}
func (rt realTicker) C() <-chan time.Time {
return rt.Ticker.C
}
type Fake interface {
Clock
Advance(time.Duration)
}
// A fast fake clock returns from Sleep calls immediately.
//
// Any waiting operation appears to complete immediately, as though time is
// running infinitely fast, but only when waiting.
func NewFast(from Clock) Fake {
if from == nil {
from = Real
}
return NewFastAt(from.Now())
}
func NewFastAt(t time.Time) Fake {
return &fastFake{t: t}
}
type fastFake struct {
t time.Time
mutex sync.RWMutex
}
func (f *fastFake) Now() time.Time {
f.mutex.RLock()
defer f.mutex.RUnlock()
t := f.t
return t
}
func (f *fastFake) Sleep(d time.Duration) {
f.mutex.Lock()
defer f.mutex.Unlock()
f.t = f.t.Add(d)
}
func (f *fastFake) Advance(d time.Duration) {
f.Sleep(d)
}
func (f *fastFake) After(d time.Duration) <-chan time.Time {
f.Sleep(d)
c := make(chan time.Time, 1)
c <- f.Now()
return c
}
func (f *fastFake) NewTicker(d time.Duration) Ticker {
return newFakeTicker(f, d)
}
// A slow clock doesn't return from Sleep calls until Advance has been called
// enough.
func NewSlow(from Clock) Fake {
if from == nil {
from = Real
}
return NewSlowAt(from.Now())
}
func NewSlowAt(t time.Time) Fake {
return &slowFake{t: t}
}
type slowFake struct {
t time.Time
mutex sync.RWMutex
sleepers []*slowSleeper
}
type slowSleeper struct {
until time.Time
done chan<- time.Time
}
func (f *slowFake) Now() time.Time {
f.mutex.RLock()
defer f.mutex.RUnlock()
t := f.t
return t
}
func (f *slowFake) Sleep(d time.Duration) {
<-f.After(d)
}
func (f *slowFake) Advance(d time.Duration) {
f.mutex.Lock()
defer f.mutex.Unlock()
t2 := f.t.Add(d)
var newSleepers []*slowSleeper
for _, s := range f.sleepers {
if t2.Sub(s.until) >= 0 {
s.done <- t2
} else {
newSleepers = append(newSleepers, s)
}
}
f.sleepers = newSleepers
f.t = t2
}
func (f *slowFake) After(d time.Duration) <-chan time.Time {
f.mutex.Lock()
defer f.mutex.Unlock()
done := make(chan time.Time, 1)
if d == 0 {
done <- f.t
return done
}
s := &slowSleeper{
until: f.t.Add(d),
done: done,
}
f.sleepers = append(f.sleepers, s)
return done
}
func (f *slowFake) NewTicker(d time.Duration) Ticker {
return newFakeTicker(f, d)
}
type fakeTicker struct {
clock Clock
c chan time.Time
stopChan chan struct{}
}
func newFakeTicker(c Clock, d time.Duration) Ticker {
ft := &fakeTicker{
clock: c,
c: make(chan time.Time, 1),
stopChan: make(chan struct{}),
}
go ft.tickLoop(d)
return ft
}
func (ft *fakeTicker) tickLoop(d time.Duration) {
for {
ft.clock.Sleep(d)
select {
case ft.c <- ft.clock.Now():
case <-ft.stopChan:
return
}
}
}
func (ft *fakeTicker) C() <-chan time.Time {
return ft.c
}
func (ft *fakeTicker) Stop() {
close(ft.stopChan)
}
// © 2015 Jonathan Boulle Apache 2.0 License
|
