-
Notifications
You must be signed in to change notification settings - Fork 2
/
unit_cache.go
99 lines (84 loc) · 2.71 KB
/
unit_cache.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
/* Copyright 2022 Freerware
*
* 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 work
import (
"context"
"errors"
"fmt"
"sync"
"github.com/uber-go/tally/v4"
)
type memoryCacheClient struct {
m sync.Map
}
func (mcc *memoryCacheClient) Delete(ctx context.Context, key string) (err error) {
mcc.m.Delete(key)
return
}
func (mcc *memoryCacheClient) Get(ctx context.Context, key string) (entry interface{}, err error) {
entry, _ = mcc.m.Load(key)
return
}
func (mcc *memoryCacheClient) Set(ctx context.Context, key string, entry interface{}) (err error) {
mcc.m.Store(key, entry)
return
}
// UnitCacheClient represents a client for a cache provider.
type UnitCacheClient interface {
Get(context.Context, string) (interface{}, error)
Set(context.Context, string, interface{}) error
Delete(context.Context, string) error
}
// UnitCache represents the cache that the work unit manipulates as a result
// of entity registration.
type UnitCache struct {
cc UnitCacheClient
scope tally.Scope
}
var (
// ErrUncachableEntity represents the error that is returned when an attempt
// to cache an entity with an unresolvable ID occurs.
ErrUncachableEntity = errors.New("unable to cache entity - does not implement supported interfaces")
)
func cacheKey(t TypeName, id interface{}) string {
return fmt.Sprintf("%s-%v", string(t), id)
}
// Delete removes an entity from the work unit cache.
func (uc *UnitCache) delete(ctx context.Context, entity interface{}) (err error) {
t := TypeNameOf(entity)
if id, ok := id(entity); ok {
if err = uc.cc.Delete(ctx, cacheKey(t, id)); err == nil {
uc.scope.Counter(cacheDelete).Inc(1)
}
}
return
}
// Store places the provided entity in the work unit cache.
func (uc *UnitCache) store(ctx context.Context, entity interface{}) (err error) {
id, ok := id(entity)
if !ok {
return ErrUncachableEntity
}
t := TypeNameOf(entity)
if err = uc.cc.Set(ctx, cacheKey(t, id), entity); err == nil {
uc.scope.Counter(cacheInsert).Inc(1)
}
return
}
// Load retrieves the entity with the provided type name and ID from the work
// unit cache.
func (uc *UnitCache) Load(ctx context.Context, t TypeName, id interface{}) (entity interface{}, err error) {
return uc.cc.Get(ctx, cacheKey(t, id))
}