-
Notifications
You must be signed in to change notification settings - Fork 7
/
service.go
159 lines (140 loc) · 4.08 KB
/
service.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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
// Copyright 2019-present Open Networking Foundation.
//
// 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 set
import (
setapi "github.com/atomix/atomix-api/go/atomix/primitive/set"
"github.com/atomix/atomix-go-framework/pkg/atomix/errors"
"github.com/atomix/atomix-go-framework/pkg/atomix/meta"
)
func init() {
registerServiceFunc(newService)
}
func newService(context ServiceContext) Service {
return &setService{
ServiceContext: context,
values: make(map[string]meta.ObjectMeta),
}
}
// setService is a state machine for a list primitive
type setService struct {
ServiceContext
values map[string]meta.ObjectMeta
}
func (s *setService) Backup(writer SnapshotWriter) error {
values := make([]SetValue, 0, len(s.values))
for value, obj := range s.values {
values = append(values, SetValue{
ObjectMeta: obj.Proto(),
Value: value,
})
}
return writer.WriteState(&SetState{
Values: values,
})
}
func (s *setService) Restore(reader SnapshotReader) error {
state, err := reader.ReadState()
if err != nil {
return err
}
s.values = make(map[string]meta.ObjectMeta)
for _, value := range state.Values {
s.values[value.Value] = meta.FromProto(value.ObjectMeta)
}
return nil
}
func (s *setService) notify(event setapi.Event) {
output := &setapi.EventsResponse{
Event: event,
}
for _, events := range s.Proposals().Events().List() {
events.Notify(output)
}
}
func (s *setService) Size(size SizeQuery) (*setapi.SizeResponse, error) {
return &setapi.SizeResponse{
Size_: uint32(len(s.values)),
}, nil
}
func (s *setService) Contains(contains ContainsQuery) (*setapi.ContainsResponse, error) {
_, ok := s.values[contains.Request().Element.Value]
return &setapi.ContainsResponse{
Contains: ok,
}, nil
}
func (s *setService) Add(add AddProposal) (*setapi.AddResponse, error) {
if _, ok := s.values[add.Request().Element.Value]; ok {
return nil, errors.NewAlreadyExists("value already exists")
}
s.values[add.Request().Element.Value] = meta.FromProto(add.Request().Element.ObjectMeta)
s.notify(setapi.Event{
Type: setapi.Event_ADD,
Element: add.Request().Element,
})
return &setapi.AddResponse{
Element: add.Request().Element,
}, nil
}
func (s *setService) Remove(remove RemoveProposal) (*setapi.RemoveResponse, error) {
object, ok := s.values[remove.Request().Element.Value]
if !ok {
return nil, errors.NewNotFound("value not found")
}
if !object.Equal(meta.FromProto(remove.Request().Element.ObjectMeta)) {
return nil, errors.NewConflict("metadata mismatch")
}
delete(s.values, remove.Request().Element.Value)
element := setapi.Element{
ObjectMeta: object.Proto(),
Value: remove.Request().Element.Value,
}
s.notify(setapi.Event{
Type: setapi.Event_REMOVE,
Element: element,
})
return &setapi.RemoveResponse{
Element: element,
}, nil
}
func (s *setService) Clear(ClearProposal) (*setapi.ClearResponse, error) {
s.values = make(map[string]meta.ObjectMeta)
return &setapi.ClearResponse{}, nil
}
func (s *setService) Events(events EventsProposal) {
events.Notify(&setapi.EventsResponse{})
if events.Request().Replay {
for value, metadata := range s.values {
events.Notify(&setapi.EventsResponse{
Event: setapi.Event{
Type: setapi.Event_REPLAY,
Element: setapi.Element{
ObjectMeta: metadata.Proto(),
Value: value,
},
},
})
}
}
}
func (s *setService) Elements(elements ElementsQuery) {
defer elements.Close()
for value, object := range s.values {
elements.Notify(&setapi.ElementsResponse{
Element: setapi.Element{
ObjectMeta: object.Proto(),
Value: value,
},
})
}
}