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| // 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 { | ||
| eventType EventType | ||
| inner interface{} | ||
| } | ||
|
|
||
| // 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) |