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package melody
import (
"sync"
)
type hub struct {
sessions map[*Session]bool
broadcast chan *envelope
register chan *Session
unregister chan *Session
exit chan *envelope
open bool
rwmutex *sync.RWMutex
}
func newHub() *hub {
return &hub{
sessions: make(map[*Session]bool),
broadcast: make(chan *envelope),
register: make(chan *Session),
unregister: make(chan *Session),
exit: make(chan *envelope),
open: true,
rwmutex: &sync.RWMutex{},
}
}
func (h *hub) run() {
loop:
for {
select {
case s := <-h.register:
h.rwmutex.Lock()
h.sessions[s] = true
h.rwmutex.Unlock()
case s := <-h.unregister:
if _, ok := h.sessions[s]; ok {
h.rwmutex.Lock()
delete(h.sessions, s)
h.rwmutex.Unlock()
}
case m := <-h.broadcast:
h.rwmutex.RLock()
for s := range h.sessions {
if m.filter != nil {
if m.filter(s) {
s.writeMessage(m)
}
} else {
s.writeMessage(m)
}
}
h.rwmutex.RUnlock()
case m := <-h.exit:
h.rwmutex.Lock()
for s := range h.sessions {
s.writeMessage(m)
delete(h.sessions, s)
s.Close()
}
h.open = false
h.rwmutex.Unlock()
break loop
}
}
}
func (h *hub) closed() bool {
h.rwmutex.RLock()
defer h.rwmutex.RUnlock()
return !h.open
}
func (h *hub) len() int {
h.rwmutex.RLock()
defer h.rwmutex.RUnlock()
return len(h.sessions)
}
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