tidb state 源码
tidb state 代码
文件路径：/util/topsql/state/state.go
// Copyright 2021 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 state
import "go.uber.org/atomic"
// Default Top-SQL state values.
const (
DefTiDBTopSQLEnable = false
DefTiDBTopSQLPrecisionSeconds = 1
DefTiDBTopSQLMaxTimeSeriesCount = 100
DefTiDBTopSQLMaxMetaCount = 5000
DefTiDBTopSQLReportIntervalSeconds = 60
)
// GlobalState is the global Top-SQL state.
var GlobalState = State{
enable: atomic.NewBool(false),
PrecisionSeconds: atomic.NewInt64(DefTiDBTopSQLPrecisionSeconds),
MaxStatementCount: atomic.NewInt64(DefTiDBTopSQLMaxTimeSeriesCount),
MaxCollect: atomic.NewInt64(DefTiDBTopSQLMaxMetaCount),
ReportIntervalSeconds: atomic.NewInt64(DefTiDBTopSQLReportIntervalSeconds),
}
// State is the state for control top sql feature.
type State struct {
// enable top-sql or not.
enable *atomic.Bool
// The refresh interval of top-sql.
PrecisionSeconds *atomic.Int64
// The maximum number of statements kept in memory.
MaxStatementCount *atomic.Int64
// The maximum capacity of the collect map.
MaxCollect *atomic.Int64
// The report data interval of top-sql.
ReportIntervalSeconds *atomic.Int64
}
// EnableTopSQL enables the top SQL feature.
func EnableTopSQL() {
GlobalState.enable.Store(true)
}
// DisableTopSQL disables the top SQL feature.
func DisableTopSQL() {
GlobalState.enable.Store(false)
}
// TopSQLEnabled uses to check whether enabled the top SQL feature.
func TopSQLEnabled() bool {
return GlobalState.enable.Load()
}
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