mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-22 21:10:22 +00:00
122 lines
2.9 KiB
Go
122 lines
2.9 KiB
Go
/*
|
|
Copyright 2023 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package wait
|
|
|
|
import (
|
|
"time"
|
|
|
|
"k8s.io/utils/clock"
|
|
)
|
|
|
|
// Timer abstracts how wait functions interact with time runtime efficiently. Test
|
|
// code may implement this interface directly but package consumers are encouraged
|
|
// to use the Backoff type as the primary mechanism for acquiring a Timer. The
|
|
// interface is a simplification of clock.Timer to prevent misuse. Timers are not
|
|
// expected to be safe for calls from multiple goroutines.
|
|
type Timer interface {
|
|
// C returns a channel that will receive a struct{} each time the timer fires.
|
|
// The channel should not be waited on after Stop() is invoked. It is allowed
|
|
// to cache the returned value of C() for the lifetime of the Timer.
|
|
C() <-chan time.Time
|
|
// Next is invoked by wait functions to signal timers that the next interval
|
|
// should begin. You may only use Next() if you have drained the channel C().
|
|
// You should not call Next() after Stop() is invoked.
|
|
Next()
|
|
// Stop releases the timer. It is safe to invoke if no other methods have been
|
|
// called.
|
|
Stop()
|
|
}
|
|
|
|
type noopTimer struct {
|
|
closedCh <-chan time.Time
|
|
}
|
|
|
|
// newNoopTimer creates a timer with a unique channel to avoid contention
|
|
// for the channel's lock across multiple unrelated timers.
|
|
func newNoopTimer() noopTimer {
|
|
ch := make(chan time.Time)
|
|
close(ch)
|
|
return noopTimer{closedCh: ch}
|
|
}
|
|
|
|
func (t noopTimer) C() <-chan time.Time {
|
|
return t.closedCh
|
|
}
|
|
func (noopTimer) Next() {}
|
|
func (noopTimer) Stop() {}
|
|
|
|
type variableTimer struct {
|
|
fn DelayFunc
|
|
t clock.Timer
|
|
new func(time.Duration) clock.Timer
|
|
}
|
|
|
|
func (t *variableTimer) C() <-chan time.Time {
|
|
if t.t == nil {
|
|
d := t.fn()
|
|
t.t = t.new(d)
|
|
}
|
|
return t.t.C()
|
|
}
|
|
func (t *variableTimer) Next() {
|
|
if t.t == nil {
|
|
return
|
|
}
|
|
d := t.fn()
|
|
t.t.Reset(d)
|
|
}
|
|
func (t *variableTimer) Stop() {
|
|
if t.t == nil {
|
|
return
|
|
}
|
|
t.t.Stop()
|
|
t.t = nil
|
|
}
|
|
|
|
type fixedTimer struct {
|
|
interval time.Duration
|
|
t clock.Ticker
|
|
new func(time.Duration) clock.Ticker
|
|
}
|
|
|
|
func (t *fixedTimer) C() <-chan time.Time {
|
|
if t.t == nil {
|
|
t.t = t.new(t.interval)
|
|
}
|
|
return t.t.C()
|
|
}
|
|
func (t *fixedTimer) Next() {
|
|
// no-op for fixed timers
|
|
}
|
|
func (t *fixedTimer) Stop() {
|
|
if t.t == nil {
|
|
return
|
|
}
|
|
t.t.Stop()
|
|
t.t = nil
|
|
}
|
|
|
|
var (
|
|
// RealTimer can be passed to methods that need a clock.Timer.
|
|
RealTimer = clock.RealClock{}.NewTimer
|
|
)
|
|
|
|
var (
|
|
// internalClock is used for test injection of clocks
|
|
internalClock = clock.RealClock{}
|
|
)
|