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
|
package identity
import (
"sync"
"github.com/MichaelMure/git-bug/entity"
"github.com/MichaelMure/git-bug/repository"
)
// Resolver define the interface of an Identity resolver, able to load
// an identity from, for example, a repo or a cache.
type Resolver interface {
ResolveIdentity(id entity.Id) (Interface, error)
}
// SimpleResolver is a Resolver loading Identities directly from a Repo
type SimpleResolver struct {
repo repository.Repo
}
func NewSimpleResolver(repo repository.Repo) *SimpleResolver {
return &SimpleResolver{repo: repo}
}
func (r *SimpleResolver) ResolveIdentity(id entity.Id) (Interface, error) {
return ReadLocal(r.repo, id)
}
// StubResolver is a Resolver that doesn't load anything, only returning IdentityStub instances
type StubResolver struct{}
func NewStubResolver() *StubResolver {
return &StubResolver{}
}
func (s *StubResolver) ResolveIdentity(id entity.Id) (Interface, error) {
return &IdentityStub{id: id}, nil
}
// CachedResolver is a resolver ensuring that loading is done only once through another Resolver.
type CachedResolver struct {
mu sync.RWMutex
resolver Resolver
identities map[entity.Id]Interface
}
func NewCachedResolver(resolver Resolver) *CachedResolver {
return &CachedResolver{
resolver: resolver,
identities: make(map[entity.Id]Interface),
}
}
func (c *CachedResolver) ResolveIdentity(id entity.Id) (Interface, error) {
c.mu.RLock()
if i, ok := c.identities[id]; ok {
c.mu.RUnlock()
return i, nil
}
c.mu.RUnlock()
c.mu.Lock()
defer c.mu.Unlock()
i, err := c.resolver.ResolveIdentity(id)
if err != nil {
return nil, err
}
c.identities[id] = i
return i, nil
}
|
