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package events
import (
"sync"
"go.neonxp.dev/djson/internal/model"
)
type subscriberNode struct {
parent *subscriberNode
children map[string]*subscriberNode
channels map[string]chan model.Mutation
mu sync.RWMutex
}
func (sn *subscriberNode) subscribe(path []string, id string, ch chan model.Mutation) {
sn.mu.Lock()
defer sn.mu.Unlock()
if len(path) == 0 {
sn.channels[id] = ch
return
}
head, rest := path[0], path[1:]
child, ok := sn.children[head]
if !ok {
child = &subscriberNode{
parent: sn,
children: make(map[string]*subscriberNode),
channels: make(map[string]chan model.Mutation),
}
sn.children[head] = child
}
if len(rest) == 0 {
child.channels[id] = ch
return
}
child.subscribe(rest, id, ch)
}
func (sn *subscriberNode) unsubscribe(path []string, id string) {
sn.mu.Lock()
defer sn.mu.Unlock()
if len(path) == 0 {
close(sn.channels[id])
delete(sn.channels, id)
return
}
head, rest := path[0], path[1:]
if child, ok := sn.children[head]; ok {
child.unsubscribe(rest, id)
}
}
func (sn *subscriberNode) notify(path []string, event *model.Mutation) {
sn.mu.RLock()
defer sn.mu.RUnlock()
for _, ch := range sn.channels {
go func(ch chan model.Mutation) {
ch <- *event
}(ch)
}
if len(path) == 0 {
return
}
head, rest := path[0], path[1:]
if child, ok := sn.children[head]; ok {
child.notify(rest, event)
}
}
|
