tidb db_writer 源码
tidb db_writer 代码
文件路径：/store/mockstore/unistore/tikv/mvcc/db_writer.go
// Copyright 2019-present 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 mvcc
import (
"sync"
"github.com/pingcap/badger"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
"github.com/pingcap/tidb/store/mockstore/unistore/lockstore"
)
// DBWriter is the interface to persistent data.
type DBWriter interface {
Open()
Close()
Write(batch WriteBatch) error
DeleteRange(start, end []byte, latchHandle LatchHandle) error
NewWriteBatch(startTS, commitTS uint64, ctx *kvrpcpb.Context) WriteBatch
}
// LatchHandle is the interface for handling latches.
type LatchHandle interface {
AcquireLatches(hashVals []uint64)
ReleaseLatches(hashVals []uint64)
}
// WriteBatch is the interface to batch write.
type WriteBatch interface {
Prewrite(key []byte, lock *Lock)
Commit(key []byte, lock *Lock)
Rollback(key []byte, deleleLock bool)
PessimisticLock(key []byte, lock *Lock)
PessimisticRollback(key []byte)
}
// DBBundle represents the db bundle.
type DBBundle struct {
DB *badger.DB
LockStore *lockstore.MemStore
MemStoreMu sync.Mutex
StateTS uint64
}
// DBSnapshot represents the db snapshot.
type DBSnapshot struct {
Txn *badger.Txn
LockStore *lockstore.MemStore
}
// NewDBSnapshot returns a new db snapshot.
func NewDBSnapshot(db *DBBundle) *DBSnapshot {
return &DBSnapshot{
Txn: db.DB.NewTransaction(false),
LockStore: db.LockStore,
}
}
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