mirror of https://github.com/knative/caching.git
75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
/*
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Copyright 2018 The Knative 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 duck
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import (
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"sync"
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"k8s.io/apimachinery/pkg/watch"
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)
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// NewProxyWatcher is based on the same concept from Kubernetes apimachinery in 1.12 here:
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// https://github.com/kubernetes/apimachinery/blob/c6dd271be/pkg/watch/watch.go#L272
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// Replace this copy once we've update our client libraries.
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// proxyWatcher lets you wrap your channel in watch.Interface. Threadsafe.
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type proxyWatcher struct {
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result chan watch.Event
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stopCh chan struct{}
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mutex sync.Mutex
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stopped bool
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}
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var _ watch.Interface = (*proxyWatcher)(nil)
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// NewProxyWatcher creates new proxyWatcher by wrapping a channel
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func NewProxyWatcher(ch chan watch.Event) watch.Interface {
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return &proxyWatcher{
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result: ch,
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stopCh: make(chan struct{}),
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stopped: false,
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}
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}
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// Stop implements Interface
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func (pw *proxyWatcher) Stop() {
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pw.mutex.Lock()
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defer pw.mutex.Unlock()
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if !pw.stopped {
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pw.stopped = true
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close(pw.stopCh)
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}
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}
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// Stopping returns true if Stop() has been called
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func (pw *proxyWatcher) Stopping() bool {
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pw.mutex.Lock()
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defer pw.mutex.Unlock()
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return pw.stopped
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}
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// ResultChan implements watch.Interface
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func (pw *proxyWatcher) ResultChan() <-chan watch.Event {
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return pw.result
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}
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// StopChan returns stop channel
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func (pw *proxyWatcher) StopChan() <-chan struct{} {
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return pw.stopCh
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}
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