tidb sync_map 源码
tidb sync_map 代码
文件路径：/util/generic/sync_map.go
// Copyright 2022 PingCAP, Inc.
//
// 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 generic
import "sync"
// SyncMap is the generic version of the sync.Map.
type SyncMap[K comparable, V any] struct {
item map[K]V
mu sync.RWMutex
}
// NewSyncMap returns a new SyncMap.
func NewSyncMap[K comparable, V any](capacity int) SyncMap[K, V] {
return SyncMap[K, V]{
item: make(map[K]V, capacity),
}
}
// Store stores a value.
func (m *SyncMap[K, V]) Store(key K, value V) {
m.mu.Lock()
m.item[key] = value
m.mu.Unlock()
}
// Load loads a key value.
func (m *SyncMap[K, V]) Load(key K) (V, bool) {
m.mu.RLock()
val, exist := m.item[key]
m.mu.RUnlock()
return val, exist
}
// Delete deletes a key value.
func (m *SyncMap[K, V]) Delete(key K) {
m.mu.Lock()
delete(m.item, key)
m.mu.Unlock()
}
// Keys returns all the keys in the map.
func (m *SyncMap[K, V]) Keys() []K {
ret := make([]K, 0, len(m.item))
m.mu.RLock()
for k := range m.item {
ret = append(ret, k)
}
m.mu.RUnlock()
return ret
}
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