63 lines
1.9 KiB
Go
63 lines
1.9 KiB
Go
// Copyright 2023 PingCAP, Inc.
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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 cache
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import (
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"sync/atomic"
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"github.com/pingcap/tidb/config"
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"github.com/pingcap/tidb/statistics"
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"github.com/pingcap/tidb/statistics/handle/cache/internal/metrics"
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)
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// StatsCachePointer is used to cache the stats of a table.
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type StatsCachePointer struct {
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atomic.Pointer[StatsCache]
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}
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// NewStatsCachePointer creates a new StatsCache.
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func NewStatsCachePointer() (*StatsCachePointer, error) {
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newCache, err := NewStatsCache()
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if err != nil {
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return nil, err
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}
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result := StatsCachePointer{}
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result.Store(newCache)
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return &result, nil
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}
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// Load loads the cached stats from the cache.
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func (s *StatsCachePointer) Load() *StatsCache {
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return s.Pointer.Load()
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}
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// Replace replaces the cache with the new cache.
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func (s *StatsCachePointer) Replace(newCache *StatsCache) {
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old := s.Swap(newCache)
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if old != nil {
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old.Close()
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}
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metrics.CostGauge.Set(float64(newCache.Cost()))
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}
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// UpdateStatsCache updates the cache with the new cache.
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func (s *StatsCachePointer) UpdateStatsCache(newCache *StatsCache, tables []*statistics.Table, deletedIDs []int64, opts ...TableStatsOpt) {
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if enableQuota := config.GetGlobalConfig().Performance.EnableStatsCacheMemQuota; enableQuota {
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s.Load().Update(tables, deletedIDs, opts...)
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} else {
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s.Replace(newCache.CopyAndUpdate(tables, deletedIDs, opts...))
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}
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}
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