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object.go
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object.go
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// SPDX-FileCopyrightText: 2023 SAP SE or an SAP affiliate company and Open Component Model contributors.
//
// SPDX-License-Identifier: Apache-2.0
package finalizer
import (
"fmt"
"runtime"
"sync"
"golang.org/x/exp/slices"
)
// NumberRange can be used as source for successive id numbers to tag
// elements, since debuggers not always sow object addresses.
type NumberRange struct {
id uint64
lock sync.Mutex
}
func (n *NumberRange) NextId() uint64 {
n.lock.Lock()
defer n.lock.Unlock()
n.id++
return n.id
}
var (
lock sync.Mutex
objectranges = map[string]*NumberRange{}
)
type ObjectIdentity string
func (i ObjectIdentity) String() string {
return string(i)
}
func NewObjectIdentity(kind string) ObjectIdentity {
lock.Lock()
defer lock.Unlock()
nr := objectranges[kind]
if nr == nil {
nr = &NumberRange{}
objectranges[kind] = nr
}
return ObjectIdentity(fmt.Sprintf("%s/%d", kind, nr.NextId()))
}
type RuntimeFinalizationRecoder struct {
lock sync.Mutex
ids []ObjectIdentity
}
func (r *RuntimeFinalizationRecoder) Get() []ObjectIdentity {
r.lock.Lock()
defer r.lock.Unlock()
return slices.Clone(r.ids)
}
func (r *RuntimeFinalizationRecoder) Record(id ObjectIdentity) {
r.lock.Lock()
defer r.lock.Unlock()
r.ids = append(r.ids, id)
}
func (r *RuntimeFinalizationRecoder) IsFinalized(objs ...ObjectIdentity) bool {
for _, o := range objs {
found := false
for _, f := range r.ids {
if f == o {
found = true
break
}
}
if !found {
return false
}
}
return len(r.ids) != 0
}
type RuntimeFinalizer struct {
id ObjectIdentity
recorder *RuntimeFinalizationRecoder
finalizers []func() error
}
func fi(o *RuntimeFinalizer) {
o.finalize()
}
func NewRuntimeFinalizer(id ObjectIdentity, r *RuntimeFinalizationRecoder) *RuntimeFinalizer {
f := &RuntimeFinalizer{
id: id,
recorder: r,
}
runtime.SetFinalizer(f, fi)
return f
}
func (f *RuntimeFinalizer) finalize() {
if f.recorder != nil {
f.recorder.Record(f.id)
f.recorder = nil
for _, e := range f.finalizers {
if e != nil {
e()
}
}
}
}
func (f *RuntimeFinalizer) AddFinalizer(fi ...func() error) {
f.finalizers = append(f.finalizers, fi...)
}
type RecorderProvider interface {
GetRecorder() *RuntimeFinalizationRecoder
}
func GetRuntimeFinalizationRecorder(o any) *RuntimeFinalizationRecoder {
if r, ok := o.(RecorderProvider); ok {
return r.GetRecorder()
}
return nil
}