-
Notifications
You must be signed in to change notification settings - Fork 1
/
transaction.go
145 lines (128 loc) · 3.42 KB
/
transaction.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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
// Copyright (C) 2022 PuzzleDB Contributors.
//
// 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 memdb
import (
"github.com/cybergarage/puzzledb-go/puzzledb/coordinator"
"github.com/hashicorp/go-memdb"
)
type Document struct {
Key string
Value []byte
}
type transaction struct {
coordinator.KeyCoder
*memdb.Txn
}
// NewTransaction returns a new transaction.
func newTransactionWith(coder coordinator.KeyCoder, txn *memdb.Txn) coordinator.Transaction {
return &transaction{
KeyCoder: coder,
Txn: txn,
}
}
// Exists returns true if the object for the specified key exists.
func (txn *transaction) Exists(key coordinator.Key) (coordinator.Object, bool) {
obj, err := txn.Get(key)
if err != nil || obj == nil {
return nil, false
}
return obj, true
}
// Set sets the object for the specified key.
func (txn *transaction) Set(obj coordinator.Object) error {
keyBytes, err := txn.KeyCoder.EncodeKey(obj.Key())
if err != nil {
return err
}
doc := &Document{
Key: string(keyBytes),
Value: obj.Bytes(),
}
err = txn.Txn.Insert(tableName, doc)
if err != nil {
return err
}
return nil
}
// Get gets the object for the specified key.
func (txn *transaction) Get(key coordinator.Key) (coordinator.Object, error) {
rs, err := txn.GetRange(key)
if err != nil {
return nil, err
}
if !rs.Next() {
return nil, coordinator.NewKeyNotExistError(key)
}
return rs.Object(), nil
}
// GetRange gets the result set for the specified key.
func (txn *transaction) GetRange(key coordinator.Key, opts ...coordinator.Option) (coordinator.ResultSet, error) {
keyBytes, err := txn.KeyCoder.EncodeKey(key)
if err != nil {
return nil, err
}
offset := uint(0)
limit := int(-1)
order := coordinator.OrderNone
for _, opt := range opts {
switch v := opt.(type) {
case *coordinator.OffsetOption:
offset = v.Offset
case *coordinator.LimitOption:
limit = v.Limit
case *coordinator.OrderOption:
order = v.Order
}
}
var it memdb.ResultIterator
if order != coordinator.OrderDesc {
it, err = txn.Txn.Get(tableName, idName+prefix, string(keyBytes))
} else {
it, err = txn.Txn.GetReverse(tableName, idName+prefix, string(keyBytes))
}
if err != nil {
return nil, err
}
return newResultSet(txn.KeyCoder, key, it, offset, limit), nil
}
// Remove removes the object for the specified key.
func (txn *transaction) Remove(key coordinator.Key) error {
keyBytes, err := txn.KeyCoder.EncodeKey(key)
if err != nil {
return err
}
_, err = txn.Txn.DeleteAll(tableName, idName, string(keyBytes))
if err != nil {
return err
}
return nil
}
// Truncate removes all objects.
func (txn *transaction) Truncate() error {
_, err := txn.Txn.DeleteAll(tableName, idName)
if err != nil {
return err
}
return nil
}
// Commit commits this transaction.
func (txn *transaction) Commit() error {
txn.Txn.Commit()
return nil
}
// Cancel cancels this transaction.
func (txn *transaction) Cancel() error {
txn.Txn.Abort()
return nil
}