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references.go
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references.go
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/*
* Copyright 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
*
* 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 provider
import (
"sync"
"github.com/gardener/controller-manager-library/pkg/resources"
)
type References struct {
lock sync.RWMutex
refs map[resources.ClusterObjectKey]resources.ClusterObjectKey
usages map[resources.ClusterObjectKey]resources.ClusterObjectKeySet
}
func NewReferenceCache() *References {
return &References{
refs: map[resources.ClusterObjectKey]resources.ClusterObjectKey{},
usages: map[resources.ClusterObjectKey]resources.ClusterObjectKeySet{},
}
}
func (this *References) AddRef(holder resources.ClusterObjectKey, ref resources.ClusterObjectKey) {
this.lock.Lock()
defer this.lock.Unlock()
old, ok := this.refs[holder]
if ok && old == ref {
return
}
set := this.usages[ref]
if set == nil {
set = resources.ClusterObjectKeySet{}
this.usages[ref] = set
}
set.Add(holder)
this.del(holder)
}
func (this *References) DelRef(holder resources.ClusterObjectKey) {
this.lock.Lock()
defer this.lock.Unlock()
this.del(holder)
}
func (this *References) NotifyHolder(ctx Context, ref resources.ClusterObjectKey) {
this.lock.RLock()
defer this.lock.RUnlock()
this.notifyHolder(ctx, ref)
}
func (this *References) notifyHolder(ctx Context, ref resources.ClusterObjectKey) {
for h := range this.usages[ref] {
ctx.EnqueueKey(h)
this.notifyHolder(ctx, h)
}
}
func (this *References) del(holder resources.ClusterObjectKey) {
old, ok := this.refs[holder]
if !ok {
return
}
delete(this.refs, holder)
set := this.usages[old]
if set == nil {
return
}
set.Remove(holder)
if len(set) != 0 {
return
}
delete(this.usages, old)
}