tidb trx_events 源码
tidb trx_events 代码
文件路径：/util/trxevents/trx_events.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 trxevents
import (
"github.com/pingcap/kvproto/pkg/kvrpcpb"
)
// EventType represents the type of a transaction event.
type EventType = int
const (
// EventTypeCopMeetLock stands for the CopMeetLock event type.
EventTypeCopMeetLock = iota
)
// CopMeetLock represents an event that coprocessor reading encounters lock.
type CopMeetLock struct {
LockInfo *kvrpcpb.LockInfo
}
// TransactionEvent represents a transaction event that may belong to any of the possible types.
type TransactionEvent struct {
inner interface{}
eventType EventType
}
// GetCopMeetLock tries to extract the inner CopMeetLock event from a TransactionEvent. Returns nil if it's not a
// CopMeetLock event.
func (e TransactionEvent) GetCopMeetLock() *CopMeetLock {
if e.eventType == EventTypeCopMeetLock {
return e.inner.(*CopMeetLock)
}
return nil
}
// WrapCopMeetLock wraps a CopMeetLock event into a TransactionEvent object.
func WrapCopMeetLock(copMeetLock *CopMeetLock) TransactionEvent {
return TransactionEvent{
eventType: EventTypeCopMeetLock,
inner: copMeetLock,
}
}
// EventCallback is the callback type that handles `TransactionEvent`s.
type EventCallback = func(event TransactionEvent)
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