1 package bridging
 2 
 3 import "fmt"
 4 
 5 //橋接模式：分離抽象部分和是實現部分，使得兩部分可以獨立變化
 6 //橋接模式類似於策略模式，區別於策略模式封裝一些列演算法，使得演算法可以相互替換
 7 
 8 //將抽象部分SendMessage()與具體的實現部分Send()分離
 9 
10 //抽象部分:SendMessage
11 type AbstractMessage interface {
12     SendMessage(text, to string)
13 }
14 
15 //實現部分:Send
16 type MessageImplementer interface
 
 {
17     Send(text, to string)
18 }
19 
20 //via sms
21 func ViaSMS() MessageImplementer {
22     return &MessageSMS{}
23 }
24 
25 type MessageSMS struct {
26 }
27 
28 func (*MessageSMS) Send(text, to string) {
29     fmt.Printf("send %s to %s via SMS", text, to)
30 }
31 
32 //via email
33 func ViaEmail() MessageImplementer {
 
34     return &MessageEmail{}
35 }
36 
37 type MessageEmail struct {
38 }
39 
40 func (MessageEmail) Send(text, to string) {
41     fmt.Printf("send %s to via Email", text, to)
42 }
43 
44 //New commonMessage,method can be SMS or email
45 func NewCommonMessage(method MessageImplementer) *CommonMessage {
 
46     return &CommonMessage{
47         method: method,
48     }
49 }
50 
51 type CommonMessage struct {
52     method MessageImplementer
53 }
54 
55 func (c *CommonMessage) SendMessage(text, to string) {
56     c.method.Send(text, to)
57 }
58 
59 //New UrgencyMessage,method can be SMS or email
60 func NewUrgencyMessage(method MessageImplementer) *UrgencyMessage {
61     return &UrgencyMessage{
62         method: method,
63     }
64 }
65 
66 type UrgencyMessage struct {
67     method MessageImplementer
68 }
69 
70 func (u *UrgencyMessage) SendMessage(text, to string) {
71     u.method.Send(fmt.Sprintf("[Urgency] %s", text), to)
72 }

 1 /**
 2 * @Author:zhoutao
 3 * @Date:2020/12/12 上午9:32
 4 * @Desc:
 5  */
 6 
 7 package bridging
 8 
 9 func ExampleCommonSMS() {
10     m := NewCommonMessage(ViaSMS())
11     m.SendMessage("sending by sms:have a drink", "boo")
12 }
13 
14 func ExampleCommonEmail() {
15     m := NewCommonMessage(ViaEmail())
16     m.SendMessage("sending by email:have a drink", "boo")
17 }
18 
19 func ExampleUrgencySMS() {
20     m := NewUrgencyMessage(ViaSMS())
21     m.SendMessage("have a drink", "boo")
22 }
23 
24 func ExampleUrgencyEmail() {
25     m := NewUrgencyMessage(ViaEmail())
26     m.SendMessage("have a drink", "boo")
27 }