forked from cadence-workflow/cadence
-
Notifications
You must be signed in to change notification settings - Fork 0
/
clientCache.go
100 lines (84 loc) · 2.71 KB
/
clientCache.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
// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package common
import (
"sync"
)
type (
// ClientCache store initialized clients
ClientCache interface {
GetClientForKey(key string) (interface{}, error)
GetClientForClientKey(clientKey string) (interface{}, error)
GetHostNameForKey(key string) (string, error)
}
keyResolver func(string) (string, error)
clientProvider func(string) (interface{}, error)
clientCacheImpl struct {
keyResolver keyResolver
clientProvider clientProvider
cacheLock sync.RWMutex
clients map[string]interface{}
}
)
// NewClientCache creates a new client cache based on membership
func NewClientCache(
keyResolver keyResolver,
clientProvider clientProvider,
) ClientCache {
return &clientCacheImpl{
keyResolver: keyResolver,
clientProvider: clientProvider,
clients: make(map[string]interface{}),
}
}
func (c *clientCacheImpl) GetHostNameForKey(key string) (string, error) {
hostName, err := c.keyResolver(key)
if err != nil {
return "", err
}
return hostName, nil
}
func (c *clientCacheImpl) GetClientForKey(key string) (interface{}, error) {
clientKey, err := c.keyResolver(key)
if err != nil {
return nil, err
}
return c.GetClientForClientKey(clientKey)
}
func (c *clientCacheImpl) GetClientForClientKey(clientKey string) (interface{}, error) {
c.cacheLock.RLock()
client, ok := c.clients[clientKey]
c.cacheLock.RUnlock()
if ok {
return client, nil
}
c.cacheLock.Lock()
defer c.cacheLock.Unlock()
client, ok = c.clients[clientKey]
if ok {
return client, nil
}
client, err := c.clientProvider(clientKey)
if err != nil {
return nil, err
}
c.clients[clientKey] = client
return client, nil
}