1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73
74. 74
75. 75
76. 76
77. 77
78. 78
79. 79
80. 80
81. 81
82. 82
83. 83
84. 84
85. 85
86. 86
87. 87
88. 88
89. 89
90. 90

// Copyright 2020 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package eventsource

import (
	"sync"
)

// Manager manages the eventsource Messengers
type Manager struct {
	mutex sync.Mutex

	messengers map[int64]*Messenger
	connection chan struct{}
}

var manager *Manager

func init() {
	manager = &Manager{
		messengers: make(map[int64]*Messenger),
		connection: make(chan struct{}, 1),
	}
}

// GetManager returns a Manager and initializes one as singleton if there's none yet
func GetManager() *Manager {
	return manager
}

// Register message channel
func (m *Manager) Register(uid int64) <-chan *Event {
	m.mutex.Lock()
	messenger, ok := m.messengers[uid]
	if !ok {
		messenger = NewMessenger(uid)
		m.messengers[uid] = messenger
	}
	select {
	case m.connection <- struct{}{}:
	default:
	}
	m.mutex.Unlock()
	return messenger.Register()
}

// Unregister message channel
func (m *Manager) Unregister(uid int64, channel <-chan *Event) {
	m.mutex.Lock()
	defer m.mutex.Unlock()
	messenger, ok := m.messengers[uid]
	if !ok {
		return
	}
	if messenger.Unregister(channel) {
		delete(m.messengers, uid)
	}
}

// UnregisterAll message channels
func (m *Manager) UnregisterAll() {
	m.mutex.Lock()
	defer m.mutex.Unlock()
	for _, messenger := range m.messengers {
		messenger.UnregisterAll()
	}
	m.messengers = map[int64]*Messenger{}
}

// SendMessage sends a message to a particular user
func (m *Manager) SendMessage(uid int64, message *Event) {
	m.mutex.Lock()
	messenger, ok := m.messengers[uid]
	m.mutex.Unlock()
	if ok {
		messenger.SendMessage(message)
	}
}

// SendMessageBlocking sends a message to a particular user
func (m *Manager) SendMessageBlocking(uid int64, message *Event) {
	m.mutex.Lock()
	messenger, ok := m.messengers[uid]
	m.mutex.Unlock()
	if ok {
		messenger.SendMessageBlocking(message)
	}
}