github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/pingcap/tidb/sessionctx/domainctx.go (about)

     1  // Copyright 2015 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package sessionctx
    15  
    16  import (
    17  	"github.com/insionng/yougam/libraries/pingcap/tidb/context"
    18  	"github.com/insionng/yougam/libraries/pingcap/tidb/domain"
    19  )
    20  
    21  // A dummy type to avoid naming collision in context.
    22  type domainKeyType int
    23  
    24  // String defines a Stringer function for debugging and pretty printing.
    25  func (k domainKeyType) String() string {
    26  	return "domain"
    27  }
    28  
    29  const domainKey domainKeyType = 0
    30  
    31  // BindDomain binds domain to context.
    32  func BindDomain(ctx context.Context, domain *domain.Domain) {
    33  	ctx.SetValue(domainKey, domain)
    34  }
    35  
    36  // GetDomain gets domain from context.
    37  func GetDomain(ctx context.Context) *domain.Domain {
    38  	v, ok := ctx.Value(domainKey).(*domain.Domain)
    39  	if !ok {
    40  		return nil
    41  	}
    42  	return v
    43  }