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package ethutil
import (
"sync"
)
type ReactorEvent struct {
mut sync.Mutex
event string
chans []chan React
}
// Post the specified reactor resource on the channels
// currently subscribed
func (e *ReactorEvent) Post(react React) {
e.mut.Lock()
defer e.mut.Unlock()
for _, ch := range e.chans {
go func(ch chan React) {
ch <- react
}(ch)
}
}
// Add a subscriber to this event
func (e *ReactorEvent) Add(ch chan React) {
e.mut.Lock()
defer e.mut.Unlock()
e.chans = append(e.chans, ch)
}
// Remove a subscriber
func (e *ReactorEvent) Remove(ch chan React) {
e.mut.Lock()
defer e.mut.Unlock()
for i, c := range e.chans {
if c == ch {
e.chans = append(e.chans[:i], e.chans[i+1:]...)
}
}
}
// Basic reactor resource
type React struct {
Resource interface{}
Event string
}
// The reactor basic engine. Acts as bridge
// between the events and the subscribers/posters
type ReactorEngine struct {
patterns map[string]*ReactorEvent
}
func NewReactorEngine() *ReactorEngine {
return &ReactorEngine{patterns: make(map[string]*ReactorEvent)}
}
// Subscribe a channel to the specified event
func (reactor *ReactorEngine) Subscribe(event string, ch chan React) {
ev := reactor.patterns[event]
// Create a new event if one isn't available
if ev == nil {
ev = &ReactorEvent{event: event}
reactor.patterns[event] = ev
}
// Add the channel to reactor event handler
ev.Add(ch)
}
func (reactor *ReactorEngine) Unsubscribe(event string, ch chan React) {
ev := reactor.patterns[event]
if ev != nil {
ev.Remove(ch)
}
}
func (reactor *ReactorEngine) Post(event string, resource interface{}) {
ev := reactor.patterns[event]
if ev != nil {
ev.Post(React{Resource: resource, Event: event})
}
}
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