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