tidb domainctx 源码
tidb domainctx 代码
文件路径：/domain/domainctx.go
// Copyright 2015 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 domain
import (
"github.com/pingcap/tidb/sessionctx"
)
// domainKeyType is a dummy type to avoid naming collision in context.
type domainKeyType int
// String defines a Stringer function for debugging and pretty printing.
func (k domainKeyType) String() string {
return "domain"
}
const domainKey domainKeyType = 0
// BindDomain binds domain to context.
func BindDomain(ctx sessionctx.Context, domain *Domain) {
ctx.SetValue(domainKey, domain)
}
// GetDomain gets domain from context.
func GetDomain(ctx sessionctx.Context) *Domain {
v, ok := ctx.Value(domainKey).(*Domain)
if !ok {
return nil
}
return v
}
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