Documentation
¶
Overview ¶
Package mclock is a wrapper for a monotonic clock source
Index ¶
- type AbsTime
- type Alarm
- type ChanTimer
- type Clock
- type Simulated
- func (s *Simulated) ActiveTimers() int
- func (s *Simulated) After(d time.Duration) <-chan AbsTime
- func (s *Simulated) AfterFunc(d time.Duration, fn func()) Timer
- func (s *Simulated) NewTimer(d time.Duration) ChanTimer
- func (s *Simulated) Now() AbsTime
- func (s *Simulated) Run(d time.Duration)
- func (s *Simulated) Sleep(d time.Duration)
- func (s *Simulated) WaitForTimers(n int)
- type System
- type Timer
Constants ¶
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Variables ¶
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Functions ¶
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Types ¶
type AbsTime ¶
type AbsTime int64
AbsTime represents absolute monotonic time.
type Alarm ¶ added in v1.8.0
type Alarm struct {
// contains filtered or unexported fields
}
Alarm sends timed notifications on a channel. This is very similar to a regular timer, but is easier to use in code that needs to re-schedule the same timer over and over.
When scheduling an Alarm, the channel returned by C() will receive a value no later than the scheduled time. An Alarm can be reused after it has fired and can also be canceled by calling Stop.
func (*Alarm) C ¶ added in v1.8.0
func (e *Alarm) C() <-chan struct{}
C returns the alarm notification channel. This channel remains identical for the entire lifetime of the alarm, and is never closed.
type ChanTimer ¶
type ChanTimer interface {
Timer
// The channel returned by C receives a value when the timer expires.
C() <-chan AbsTime
// Reset reschedules the timer with a new timeout.
// It should be invoked only on stopped or expired timers with drained channels.
Reset(time.Duration)
}
ChanTimer is a cancellable event created by NewTimer.
type Clock ¶
type Clock interface {
Now() AbsTime
Sleep(time.Duration)
NewTimer(time.Duration) ChanTimer
After(time.Duration) <-chan AbsTime
AfterFunc(d time.Duration, f func()) Timer
}
The Clock interface makes it possible to replace the monotonic system clock with a simulated clock.
type Simulated ¶
type Simulated struct {
// contains filtered or unexported fields
}
Simulated implements a virtual Clock for reproducible time-sensitive tests. It simulates a scheduler on a virtual timescale where actual processing takes zero time.
The virtual clock doesn't advance on its own, call Run to advance it and execute timers. Since there is no way to influence the Go scheduler, testing timeout behaviour involving goroutines needs special care. A good way to test such timeouts is as follows: First perform the action that is supposed to time out. Ensure that the timer you want to test is created. Then run the clock until after the timeout. Finally observe the effect of the timeout using a channel or semaphore.
func (*Simulated) ActiveTimers ¶
ActiveTimers returns the number of timers that haven't fired.
func (*Simulated) After ¶
After returns a channel which receives the current time after the clock has advanced by d.
func (*Simulated) AfterFunc ¶
AfterFunc runs fn after the clock has advanced by d. Unlike with the system clock, fn runs on the goroutine that calls Run.
func (*Simulated) Run ¶
Run moves the clock by the given duration, executing all timers before that duration.
func (*Simulated) WaitForTimers ¶
WaitForTimers waits until the clock has at least n scheduled timers.
type System ¶
type System struct{}
System implements Clock using the system clock.
Source Files