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event.go
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event.go
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package event
import (
"fmt"
"github.com/duanhf2012/origin/log"
"runtime"
"sync"
)
//事件接受器
type EventCallBack func(event IEvent)
type IEvent interface {
GetEventType() EventType
}
type Event struct {
Type EventType
Data interface{}
ref bool
}
var emptyEvent Event
func (e *Event) Reset() {
*e = emptyEvent
}
func (e *Event) IsRef() bool {
return e.ref
}
func (e *Event) Ref() {
e.ref = true
}
func (e *Event) UnRef() {
e.ref = false
}
func (e *Event) GetEventType() EventType{
return e.Type
}
type IEventHandler interface {
Init(processor IEventProcessor)
GetEventProcessor() IEventProcessor //获得事件
NotifyEvent(IEvent)
Destroy()
//注册了事件
addRegInfo(eventType EventType,eventProcessor IEventProcessor)
removeRegInfo(eventType EventType,eventProcessor IEventProcessor)
}
type IEventChannel interface {
PushEvent(ev IEvent) error
}
type IEventProcessor interface {
IEventChannel
Init(eventChannel IEventChannel)
EventHandler(ev IEvent)
RegEventReceiverFunc(eventType EventType, receiver IEventHandler,callback EventCallBack)
UnRegEventReceiverFun(eventType EventType, receiver IEventHandler)
castEvent(event IEvent) //广播事件
addBindEvent(eventType EventType, receiver IEventHandler,callback EventCallBack)
addListen(eventType EventType, receiver IEventHandler)
removeBindEvent(eventType EventType, receiver IEventHandler)
removeListen(eventType EventType, receiver IEventHandler)
}
type EventHandler struct {
//已经注册的事件类型
eventProcessor IEventProcessor
//已经注册的事件
locker sync.RWMutex
mapRegEvent map[EventType]map[IEventProcessor]interface{} //向其他事件处理器监听的事件类型
}
type EventProcessor struct {
IEventChannel
locker sync.RWMutex
mapListenerEvent map[EventType]map[IEventProcessor]int //监听者信息
mapBindHandlerEvent map[EventType]map[IEventHandler]EventCallBack//收到事件处理
}
func NewEventHandler() IEventHandler{
eh := EventHandler{}
eh.mapRegEvent = map[EventType]map[IEventProcessor]interface{}{}
return &eh
}
func NewEventProcessor() IEventProcessor{
ep := EventProcessor{}
ep.mapListenerEvent = map[EventType]map[IEventProcessor]int{}
ep.mapBindHandlerEvent = map[EventType]map[IEventHandler]EventCallBack{}
return &ep
}
func (handler *EventHandler) addRegInfo(eventType EventType,eventProcessor IEventProcessor){
handler.locker.Lock()
defer handler.locker.Unlock()
if handler.mapRegEvent == nil {
handler.mapRegEvent = map[EventType]map[IEventProcessor]interface{}{}
}
if _,ok := handler.mapRegEvent[eventType] ;ok == false{
handler.mapRegEvent[eventType] = map[IEventProcessor]interface{}{}
}
handler.mapRegEvent[eventType][eventProcessor] = nil
}
func (handler *EventHandler) removeRegInfo(eventType EventType,eventProcessor IEventProcessor){
if _,ok := handler.mapRegEvent[eventType];ok == true {
delete(handler.mapRegEvent[eventType],eventProcessor)
}
}
func (handler *EventHandler) GetEventProcessor() IEventProcessor{
return handler.eventProcessor
}
func (handler *EventHandler) NotifyEvent(ev IEvent){
handler.GetEventProcessor().castEvent(ev)
}
func (handler *EventHandler) Init(processor IEventProcessor){
handler.eventProcessor = processor
handler.mapRegEvent =map[EventType]map[IEventProcessor]interface{}{}
}
func (processor *EventProcessor) Init(eventChannel IEventChannel){
processor.IEventChannel = eventChannel
}
func (processor *EventProcessor) addBindEvent(eventType EventType, receiver IEventHandler,callback EventCallBack){
processor.locker.Lock()
defer processor.locker.Unlock()
if _,ok := processor.mapBindHandlerEvent[eventType]; ok == false {
processor.mapBindHandlerEvent[eventType] = map[IEventHandler]EventCallBack{}
}
processor.mapBindHandlerEvent[eventType][receiver] = callback
}
func (processor *EventProcessor) addListen(eventType EventType, receiver IEventHandler){
processor.locker.Lock()
defer processor.locker.Unlock()
if _,ok := processor.mapListenerEvent[eventType];ok == false{
processor.mapListenerEvent[eventType] = map[IEventProcessor]int{}
}
processor.mapListenerEvent[eventType][receiver.GetEventProcessor()] += 1
}
func (processor *EventProcessor) removeBindEvent(eventType EventType, receiver IEventHandler){
processor.locker.Lock()
defer processor.locker.Unlock()
if _,ok := processor.mapBindHandlerEvent[eventType];ok == true{
delete(processor.mapBindHandlerEvent[eventType], receiver)
}
}
func (processor *EventProcessor) removeListen(eventType EventType, receiver IEventHandler){
processor.locker.Lock()
defer processor.locker.Unlock()
if _,ok := processor.mapListenerEvent[eventType];ok == true{
processor.mapListenerEvent[eventType][receiver.GetEventProcessor()]-=1
if processor.mapListenerEvent[eventType][receiver.GetEventProcessor()] <= 0 {
delete(processor.mapListenerEvent[eventType], receiver.GetEventProcessor())
}
}
}
func (processor *EventProcessor) RegEventReceiverFunc(eventType EventType, receiver IEventHandler,callback EventCallBack){
//记录receiver自己注册过的事件
receiver.addRegInfo(eventType, processor)
//记录当前所属IEventProcessor注册的回调
receiver.GetEventProcessor().addBindEvent(eventType, receiver,callback)
//将注册加入到监听中
processor.addListen(eventType, receiver)
}
func (processor *EventProcessor) UnRegEventReceiverFun(eventType EventType, receiver IEventHandler) {
processor.removeListen(eventType, receiver)
receiver.GetEventProcessor().removeBindEvent(eventType, receiver)
receiver.removeRegInfo(eventType, processor)
}
func (handler *EventHandler) Destroy(){
handler.locker.Lock()
defer handler.locker.Unlock()
for eventTyp,mapEventProcess := range handler.mapRegEvent {
if mapEventProcess == nil {
continue
}
for eventProcess := range mapEventProcess {
eventProcess.UnRegEventReceiverFun(eventTyp, handler)
}
}
}
func (processor *EventProcessor) EventHandler(ev IEvent) {
defer func() {
if r := recover(); r != nil {
buf := make([]byte, 4096)
l := runtime.Stack(buf, false)
errString := fmt.Sprint(r)
log.Dump(string(buf[:l]),log.String("error",errString))
}
}()
mapCallBack,ok := processor.mapBindHandlerEvent[ev.GetEventType()]
if ok == false {
return
}
for _,callback := range mapCallBack {
callback(ev)
}
}
func (processor *EventProcessor) castEvent(event IEvent){
if processor.mapListenerEvent == nil {
log.Error("mapListenerEvent not init!")
return
}
eventProcessor,ok := processor.mapListenerEvent[event.GetEventType()]
if ok == false || processor == nil{
log.Debug("event is not listen",log.Int("event type",int(event.GetEventType())))
return
}
for proc := range eventProcessor {
proc.PushEvent(event)
}
}