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 configmap
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import (
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"sync"
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corev1 "k8s.io/api/core/v1"
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)
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// ManualWatcher will notify Observers when a ConfigMap is manually reported as changed
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type ManualWatcher struct {
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Namespace string
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// Guards observers
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sync.RWMutex
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observers map[string][]Observer
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}
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var _ Watcher = (*ManualWatcher)(nil)
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// Watch implements Watcher
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func (w *ManualWatcher) Watch(name string, o ...Observer) {
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w.Lock()
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defer w.Unlock()
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if w.observers == nil {
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w.observers = make(map[string][]Observer, 1)
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}
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w.observers[name] = append(w.observers[name], o...)
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}
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// ForEach implements Watcher
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func (w *ManualWatcher) ForEach(f func(string, []Observer) error) error {
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for k, v := range w.observers {
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if err := f(k, v); err != nil {
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return err
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}
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}
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return nil
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}
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// Start implements Watcher
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func (w *ManualWatcher) Start(<-chan struct{}) error {
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return nil
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}
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// OnChange invokes the callbacks of all observers of the given ConfigMap.
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func (w *ManualWatcher) OnChange(configMap *corev1.ConfigMap) {
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if configMap.Namespace != w.Namespace {
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return
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}
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// Within our namespace, take the lock and see if there are any registered observers.
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w.RLock()
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defer w.RUnlock()
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// Iterate over the observers and invoke their callbacks.
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for _, o := range w.observers[configMap.Name] {
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o(configMap)
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}
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}
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