/
memory_backend.go
90 lines (66 loc) · 1.81 KB
/
memory_backend.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
// Copyright 2016 IBM Corporation
//
// 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 cluster
import (
"fmt"
"sync"
)
func newMemoryBackend() *memoryBackend {
return &memoryBackend{
members: make(map[MemberID]*member),
}
}
type memoryBackend struct {
members map[MemberID]*member
mutex sync.RWMutex
}
func (b *memoryBackend) WriteMember(m *member) error {
b.mutex.Lock()
defer b.mutex.Unlock()
b.members[m.ID()] = m
return nil
}
func (b *memoryBackend) DeleteMember(id MemberID) error {
b.mutex.Lock()
defer b.mutex.Unlock()
_, exists := b.members[id]
if !exists {
return fmt.Errorf("Member %v does not exist", id)
}
delete(b.members, id)
return nil
}
func (b *memoryBackend) ReadMember(id MemberID) (*member, error) {
b.mutex.RLock()
defer b.mutex.RUnlock()
return b.members[id], nil
}
func (b *memoryBackend) ReadMembers() (map[MemberID]*member, error) {
b.mutex.RLock()
defer b.mutex.RUnlock()
snapshot := make(map[MemberID]*member, len(b.members))
for id, member := range b.members {
snapshot[id] = member
}
return snapshot, nil
}
func (b *memoryBackend) ReadMemberIDs() (map[MemberID]struct{}, error) {
b.mutex.RLock()
defer b.mutex.RUnlock()
ids := make(map[MemberID]struct{})
for id := range b.members {
ids[id] = struct{}{}
}
return ids, nil
}