mirror of
https://github.com/yunionio/cloudpods.git
synced 2026-05-07 22:24:32 +08:00
89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
// Copyright 2019 Yunion
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package db
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import (
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"database/sql"
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"sync"
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"yunion.io/x/pkg/errors"
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)
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type ICacheable interface {
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GetId() string
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}
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type SCacheManager[T ICacheable] struct {
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cache *sync.Map
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manager IStandaloneModelManager
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}
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func NewCacheManager[T ICacheable](manager IStandaloneModelManager) *SCacheManager[T] {
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return &SCacheManager[T]{
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cache: &sync.Map{},
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manager: manager,
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}
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}
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func (cm *SCacheManager[T]) Invalidate() {
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cm.cache = nil
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}
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func (cm *SCacheManager[T]) FetchById(id string) (*T, error) {
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if cm.cache == nil {
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cm.fetchCacheFromDB()
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}
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m, ok := cm.cache.Load(id)
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if ok {
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return m.(*T), nil
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} else {
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return nil, errors.Wrapf(sql.ErrNoRows, "no such id %s", id)
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}
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}
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func (cm *SCacheManager[T]) RawFetchById(id string) (*T, error) {
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return cm.FetchById(id)
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}
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func (cm *SCacheManager[T]) fetchCacheFromDB() error {
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q := cm.manager.Query()
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ret := make([]T, 0)
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err := FetchModelObjects(cm.manager, q, &ret)
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if err != nil {
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return errors.Wrap(err, "FetchModelObjects")
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}
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cache := &sync.Map{}
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for i := range ret {
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cache.Store(ret[i].GetId(), &ret[i])
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}
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cm.cache = cache
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return nil
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}
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func (cm *SCacheManager[T]) Update(obj *T) {
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cm.cache.Store((*obj).GetId(), obj)
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}
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func (cm *SCacheManager[T]) Delete(obj *T) {
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cm.cache.Delete((*obj).GetId())
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}
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func (cm *SCacheManager[T]) Range(proc func(key interface{}, value interface{}) bool) {
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if cm.cache == nil {
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cm.fetchCacheFromDB()
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}
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cm.cache.Range(proc)
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}
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