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// 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"
// Messenger is a per uid message store
type Messenger struct {
mutex sync.Mutex
uid int64
channels []chan *Event
}
// NewMessenger creates a messenger for a particular uid
func NewMessenger(uid int64) *Messenger {
return &Messenger{
uid: uid,
channels: [](chan *Event){},
}
}
// Register returns a new chan []byte
func (m *Messenger) Register() <-chan *Event {
m.mutex.Lock()
// TODO: Limit the number of messengers per uid
channel := make(chan *Event, 1)
m.channels = append(m.channels, channel)
m.mutex.Unlock()
return channel
}
// Unregister removes the provider chan []byte
func (m *Messenger) Unregister(channel <-chan *Event) bool {
m.mutex.Lock()
defer m.mutex.Unlock()
for i, toRemove := range m.channels {
if channel == toRemove {
m.channels = append(m.channels[:i], m.channels[i+1:]...)
close(toRemove)
break
}
}
return len(m.channels) == 0
}
// UnregisterAll removes all chan []byte
func (m *Messenger) UnregisterAll() {
m.mutex.Lock()
defer m.mutex.Unlock()
for _, channel := range m.channels {
close(channel)
}
m.channels = nil
}
// SendMessage sends the message to all registered channels
func (m *Messenger) SendMessage(message *Event) {
m.mutex.Lock()
defer m.mutex.Unlock()
for i := range m.channels {
channel := m.channels[i]
select {
case channel <- message:
default:
}
}
}
// SendMessageBlocking sends the message to all registered channels and ensures it gets sent
func (m *Messenger) SendMessageBlocking(message *Event) {
m.mutex.Lock()
defer m.mutex.Unlock()
for i := range m.channels {
m.channels[i] <- message
}
}
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