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subscription.go
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/
subscription.go
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package webreal
import "sync"
// 订阅中心,存储的所有频道和客户端订阅的对应关系
type SubscriptionHub struct {
mu sync.Mutex
channels map[string]*Channel
}
func NewSubscriptionHub() *SubscriptionHub {
return &SubscriptionHub{
channels: map[string]*Channel{},
}
}
// 订阅主题
func (s *SubscriptionHub) Subscribe(channel string, client *Client) {
s.mu.Lock()
defer s.mu.Unlock()
if _, found := s.channels[channel]; !found {
s.channels[channel] = NewChannel()
}
s.channels[channel].Add(client)
}
// 退订主题
func (s *SubscriptionHub) Unsubscribe(channel string, client *Client) {
if _, found := s.channels[channel]; !found {
return
}
s.channels[channel].Remove(client)
}
// 向客户端推送主题消息
func (s *SubscriptionHub) Publish(channel string, msg []byte) {
if _, found := s.channels[channel]; !found {
return
}
s.channels[channel].Range(func(c *Client) {
c.Write(msg)
})
}