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// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
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)
}
}
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