tidb once_error 源码
tidb once_error 代码
文件路径：/br/pkg/lightning/common/once_error.go
// Copyright 2019 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 common
import (
"sync"
)
// OnceError is an error value which will can be assigned once.
//
// The zero value is ready for use.
type OnceError struct {
lock sync.Mutex
err error
}
// Set assigns an error to this instance, if `e != nil`.
//
// If this method is called multiple times, only the first call is effective.
func (oe *OnceError) Set(e error) {
if e != nil {
oe.lock.Lock()
if oe.err == nil {
oe.err = e
}
oe.lock.Unlock()
}
}
// Get returns the first error value stored in this instance.
func (oe *OnceError) Get() error {
oe.lock.Lock()
defer oe.lock.Unlock()
return oe.err
}
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