forked from ngaut/unistore
/
db_writer.go
63 lines (54 loc) · 1.56 KB
/
db_writer.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package mvcc
import (
"sync"
"github.com/ngaut/unistore/lockstore"
"github.com/pingcap/badger"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
)
// 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
}
type LatchHandle interface {
AcquireLatches(hashVals []uint64)
ReleaseLatches(hashVals []uint64)
}
type WriteBatch interface {
Prewrite(key []byte, lock *MvccLock)
Commit(key []byte, lock *MvccLock)
Rollback(key []byte, deleleLock bool)
PessimisticLock(key []byte, lock *MvccLock)
PessimisticRollback(key []byte)
}
type DBBundle struct {
DB *badger.DB
LockStore *lockstore.MemStore
MemStoreMu sync.Mutex
StateTS uint64
}
type DBSnapshot struct {
Txn *badger.Txn
LockStore *lockstore.MemStore
}
func NewDBSnapshot(db *DBBundle) *DBSnapshot {
return &DBSnapshot{
Txn: db.DB.NewTransaction(false),
LockStore: db.LockStore,
}
}