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package fakeclock
import (
"sync"
"time"
"github.com/pivotal-golang/clock"
)
type timeWatcher interface {
timeUpdated(time.Time)
}
type FakeClock struct {
now time.Time
watchers map[timeWatcher]struct{}
cond *sync.Cond
}
func NewFakeClock(now time.Time) *FakeClock {
return &FakeClock{
now: now,
watchers: make(map[timeWatcher]struct{}),
cond: &sync.Cond{L: &sync.Mutex{}},
}
}
func (clock *FakeClock) Since(t time.Time) time.Duration {
return clock.Now().Sub(t)
}
func (clock *FakeClock) Now() time.Time {
clock.cond.L.Lock()
defer clock.cond.L.Unlock()
return clock.now
}
func (clock *FakeClock) Increment(duration time.Duration) {
clock.increment(duration, false)
}
func (clock *FakeClock) IncrementBySeconds(seconds uint64) {
clock.Increment(time.Duration(seconds) * time.Second)
}
func (clock *FakeClock) WaitForWatcherAndIncrement(duration time.Duration) {
clock.increment(duration, true)
}
func (clock *FakeClock) NewTimer(d time.Duration) clock.Timer {
timer := newFakeTimer(clock, d, false)
clock.addTimeWatcher(timer)
return timer
}
func (clock *FakeClock) Sleep(d time.Duration) {
<-clock.NewTimer(d).C()
}
func (clock *FakeClock) NewTicker(d time.Duration) clock.Ticker {
timer := newFakeTimer(clock, d, true)
clock.addTimeWatcher(timer)
return newFakeTicker(timer)
}
func (clock *FakeClock) WatcherCount() int {
clock.cond.L.Lock()
defer clock.cond.L.Unlock()
return len(clock.watchers)
}
func (clock *FakeClock) increment(duration time.Duration, waitForWatchers bool) {
clock.cond.L.Lock()
for waitForWatchers && len(clock.watchers) == 0 {
clock.cond.Wait()
}
now := clock.now.Add(duration)
clock.now = now
watchers := make([]timeWatcher, 0, len(clock.watchers))
for w, _ := range clock.watchers {
watchers = append(watchers, w)
}
clock.cond.L.Unlock()
for _, w := range watchers {
w.timeUpdated(now)
}
}
func (clock *FakeClock) addTimeWatcher(tw timeWatcher) {
clock.cond.L.Lock()
clock.watchers[tw] = struct{}{}
clock.cond.L.Unlock()
tw.timeUpdated(clock.Now())
clock.cond.Broadcast()
}
func (clock *FakeClock) removeTimeWatcher(tw timeWatcher) {
clock.cond.L.Lock()
delete(clock.watchers, tw)
clock.cond.L.Unlock()
}
|
