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event.go
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event.go
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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright 2019 DNA Dev team
//
/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package events
import (
"errors"
"sync"
)
type Event struct {
m sync.RWMutex
subscribers map[EventType]map[Subscriber]EventFunc
}
func NewEvent() *Event {
return &Event{
subscribers: make(map[EventType]map[Subscriber]EventFunc),
}
}
// adds a new subscriber to Event.
func (e *Event) Subscribe(eventtype EventType, eventfunc EventFunc) Subscriber {
e.m.Lock()
defer e.m.Unlock()
sub := make(chan interface{})
_, ok := e.subscribers[eventtype]
if !ok {
e.subscribers[eventtype] = make(map[Subscriber]EventFunc)
}
e.subscribers[eventtype][sub] = eventfunc
return sub
}
// UnSubscribe removes the specified subscriber
func (e *Event) UnSubscribe(eventtype EventType, subscriber Subscriber) (err error) {
e.m.Lock()
defer e.m.Unlock()
subEvent, ok := e.subscribers[eventtype]
if !ok {
err = errors.New("No event type.")
return
}
delete(subEvent, subscriber)
close(subscriber)
return
}
//Notify subscribers that Subscribe specified event
func (e *Event) Notify(eventtype EventType, value interface{}) (err error) {
e.m.RLock()
defer e.m.RUnlock()
subs, ok := e.subscribers[eventtype]
if !ok {
err = errors.New("No event type.")
return
}
for _, event := range subs {
go e.NotifySubscriber(event, value)
}
return
}
func (e *Event) NotifySubscriber(eventfunc EventFunc, value interface{}) {
if eventfunc == nil {
return
}
//invode subscriber event func
eventfunc(value)
}
//Notify all event subscribers
func (e *Event) NotifyAll() (errs []error) {
e.m.RLock()
defer e.m.RUnlock()
for eventtype, _ := range e.subscribers {
if err := e.Notify(eventtype, nil); err != nil {
errs = append(errs, err)
}
}
return errs
}