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mux.go
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mux.go
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// Itero - Online iterative vote application
// Copyright (C) 2020 Joseph Boudou
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package events
import (
"github.com/tevino/abool"
)
// mux is the default asynchronous Manager.
type mux struct {
ch chan<- Event
closed *abool.AtomicBool
}
func (self *mux) Send(evt Event) error {
if self.closed.IsSet() {
return ManagerClosedError
}
self.ch <- evt
return nil
}
type addReceiverEvent Receiver
func (self *mux) AddReceiver(receiver Receiver) error {
return self.Send(addReceiverEvent(receiver))
}
func (self *mux) Close() error {
if self.closed.SetToIf(false, true) {
close(self.ch)
}
return nil
}
// muxRun is the goroutine of mux.
func muxRun(ch <-chan Event) {
receivers := make([]Receiver, 0, 4)
// main loop
for evt := range ch {
switch typed := evt.(type) {
case addReceiverEvent:
receivers = append(receivers, Receiver(typed))
default:
for _, receiver := range receivers {
receiver.Receive(evt)
}
}
}
// close loop
for _, receiver := range receivers {
receiver.Close()
}
}
// NewAsyncManager creates a new asynchronous Manager.
//
// An asynchronous manager launch a goroutine that calls the Receive method of all the registered
// receivers for each sent event. Events are sent to this goroutine through a channel whose size is
// given as argument to NewAsyncManager.
func NewAsyncManager(chanSize int) Manager {
ch := make(chan Event, chanSize)
go muxRun(ch)
return &mux{ch: ch, closed: abool.New()}
}