How to use Listen method of event Package

Best Testkube code snippet using event.Listen

listener.go

Source:listener.go Github

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...30 "github.com/apache/dubbo-go/common/constant"31 "github.com/apache/dubbo-go/common/logger"32 "github.com/apache/dubbo-go/remoting"33)34// ZkEventListener ...35type ZkEventListener struct {36 client *ZookeeperClient37 pathMapLock sync.Mutex38 pathMap map[string]struct{}39 wg sync.WaitGroup40}41// NewZkEventListener ...42func NewZkEventListener(client *ZookeeperClient) *ZkEventListener {43 return &ZkEventListener{44 client: client,45 pathMap: make(map[string]struct{}),46 }47}48// SetClient ...49func (l *ZkEventListener) SetClient(client *ZookeeperClient) {50 l.client = client51}52// ListenServiceNodeEvent ...53func (l *ZkEventListener) ListenServiceNodeEvent(zkPath string, listener ...remoting.DataListener) bool {54 defer l.wg.Done()55 var zkEvent zk.Event56 for {57 keyEventCh, err := l.client.ExistW(zkPath)58 if err != nil {59 logger.Warnf("existW{key:%s} = error{%v}", zkPath, err)60 return false61 }62 select {63 case zkEvent = <-keyEventCh:64 logger.Warnf("get a zookeeper zkEvent{type:%s, server:%s, path:%s, state:%d-%s, err:%s}",65 zkEvent.Type.String(), zkEvent.Server, zkEvent.Path, zkEvent.State, StateToString(zkEvent.State), zkEvent.Err)66 switch zkEvent.Type {67 case zk.EventNodeDataChanged:68 logger.Warnf("zk.ExistW(key{%s}) = event{EventNodeDataChanged}", zkPath)69 if len(listener) > 0 {70 content, _, _ := l.client.Conn.Get(zkEvent.Path)71 listener[0].DataChange(remoting.Event{Path: zkEvent.Path, Action: remoting.EventTypeUpdate, Content: string(content)})72 }73 case zk.EventNodeCreated:74 logger.Warnf("zk.ExistW(key{%s}) = event{EventNodeCreated}", zkPath)75 if len(listener) > 0 {76 content, _, _ := l.client.Conn.Get(zkEvent.Path)77 listener[0].DataChange(remoting.Event{Path: zkEvent.Path, Action: remoting.EventTypeAdd, Content: string(content)})78 }79 case zk.EventNotWatching:80 logger.Warnf("zk.ExistW(key{%s}) = event{EventNotWatching}", zkPath)81 case zk.EventNodeDeleted:82 logger.Warnf("zk.ExistW(key{%s}) = event{EventNodeDeleted}", zkPath)83 return true84 }85 case <-l.client.Done():86 return false87 }88 }89 return false90}91func (l *ZkEventListener) handleZkNodeEvent(zkPath string, children []string, listener remoting.DataListener) {92 contains := func(s []string, e string) bool {93 for _, a := range s {94 if a == e {95 return true96 }97 }98 return false99 }100 newChildren, err := l.client.GetChildren(zkPath)101 if err != nil {102 if err == errNilChildren {103 content, _, err := l.client.Conn.Get(zkPath)104 if err != nil {105 logger.Errorf("Get new node path {%v} 's content error,message is {%v}", zkPath, perrors.WithStack(err))106 } else {107 listener.DataChange(remoting.Event{Path: zkPath, Action: remoting.EventTypeUpdate, Content: string(content)})108 }109 } else {110 logger.Errorf("path{%s} child nodes changed, zk.Children() = error{%v}", zkPath, perrors.WithStack(err))111 }112 }113 // a node was added -- listen the new node114 var (115 newNode string116 )117 for _, n := range newChildren {118 if contains(children, n) {119 continue120 }121 newNode = path.Join(zkPath, n)122 logger.Infof("add zkNode{%s}", newNode)123 content, _, err := l.client.Conn.Get(newNode)124 if err != nil {125 logger.Errorf("Get new node path {%v} 's content error,message is {%v}", newNode, perrors.WithStack(err))126 }127 if !listener.DataChange(remoting.Event{Path: zkPath, Action: remoting.EventTypeAdd, Content: string(content)}) {128 continue129 }130 // listen l service node131 l.wg.Add(1)132 go func(node string, zkPath string, listener remoting.DataListener) {133 logger.Infof("delete zkNode{%s}", node)134 if l.ListenServiceNodeEvent(node, listener) {135 logger.Infof("delete content{%s}", node)136 listener.DataChange(remoting.Event{Path: zkPath, Action: remoting.EventTypeDel})137 }138 logger.Warnf("listenSelf(zk path{%s}) goroutine exit now", zkPath)139 }(newNode, zkPath, listener)140 }141 // old node was deleted142 var oldNode string143 for _, n := range children {144 if contains(newChildren, n) {145 continue146 }147 oldNode = path.Join(zkPath, n)148 logger.Warnf("delete zkPath{%s}", oldNode)149 if err != nil {150 logger.Errorf("NewURL(i{%s}) = error{%v}", n, perrors.WithStack(err))151 continue152 }153 listener.DataChange(remoting.Event{Path: oldNode, Action: remoting.EventTypeDel})154 }155}156func (l *ZkEventListener) listenDirEvent(zkPath string, listener remoting.DataListener) {157 defer l.wg.Done()158 var (159 failTimes int160 event chan struct{}161 zkEvent zk.Event162 )163 event = make(chan struct{}, 4)164 defer close(event)165 for {166 // get current children for a zkPath167 children, childEventCh, err := l.client.GetChildrenW(zkPath)168 if err != nil {169 failTimes++170 if MaxFailTimes <= failTimes {171 failTimes = MaxFailTimes172 }173 logger.Infof("listenDirEvent(path{%s}) = error{%v}", zkPath, err)174 // clear the event channel175 CLEAR:176 for {177 select {178 case <-event:179 default:180 break CLEAR181 }182 }183 l.client.RegisterEvent(zkPath, &event)184 if err == errNilNode {185 logger.Warnf("listenDirEvent(path{%s}) got errNilNode,so exit listen", zkPath)186 l.client.UnregisterEvent(zkPath, &event)187 return188 }189 select {190 case <-getty.GetTimeWheel().After(timeSecondDuration(failTimes * ConnDelay)):191 l.client.UnregisterEvent(zkPath, &event)192 continue193 case <-l.client.Done():194 l.client.UnregisterEvent(zkPath, &event)195 logger.Warnf("client.done(), listen(path{%s}) goroutine exit now...", zkPath)196 return197 case <-event:198 logger.Infof("get zk.EventNodeDataChange notify event")199 l.client.UnregisterEvent(zkPath, &event)200 l.handleZkNodeEvent(zkPath, nil, listener)201 continue202 }203 }204 failTimes = 0205 for _, c := range children {206 // listen l service node207 dubboPath := path.Join(zkPath, c)208 //Save the path to avoid listen repeatedly209 l.pathMapLock.Lock()210 _, ok := l.pathMap[dubboPath]211 l.pathMapLock.Unlock()212 if ok {213 logger.Warnf("@zkPath %s has already been listened.", zkPath)214 continue215 }216 l.pathMapLock.Lock()217 l.pathMap[dubboPath] = struct{}{}218 l.pathMapLock.Unlock()219 content, _, err := l.client.Conn.Get(dubboPath)220 if err != nil {221 logger.Errorf("Get new node path {%v} 's content error,message is {%v}", dubboPath, perrors.WithStack(err))222 }223 logger.Debugf("Get children!{%s}", dubboPath)224 if !listener.DataChange(remoting.Event{Path: dubboPath, Action: remoting.EventTypeAdd, Content: string(content)}) {225 continue226 }227 logger.Infof("listen dubbo service key{%s}", dubboPath)228 l.wg.Add(1)229 go func(zkPath string, listener remoting.DataListener) {230 if l.ListenServiceNodeEvent(zkPath) {231 listener.DataChange(remoting.Event{Path: zkPath, Action: remoting.EventTypeDel})232 }233 logger.Warnf("listenSelf(zk path{%s}) goroutine exit now", zkPath)234 }(dubboPath, listener)235 //listen sub path recursive236 //if zkPath is end of "providers/ & consumers/" we do not listen children dir237 if strings.LastIndex(zkPath, constant.PROVIDER_CATEGORY) == -1 &&238 strings.LastIndex(zkPath, constant.CONSUMER_CATEGORY) == -1 {239 l.wg.Add(1)240 go func(zkPath string, listener remoting.DataListener) {241 l.listenDirEvent(zkPath, listener)242 logger.Warnf("listenDirEvent(zkPath{%s}) goroutine exit now", zkPath)243 }(dubboPath, listener)244 }245 }246 select {247 case zkEvent = <-childEventCh:248 logger.Warnf("get a zookeeper zkEvent{type:%s, server:%s, path:%s, state:%d-%s, err:%s}",249 zkEvent.Type.String(), zkEvent.Server, zkEvent.Path, zkEvent.State, StateToString(zkEvent.State), zkEvent.Err)250 if zkEvent.Type != zk.EventNodeChildrenChanged {251 continue252 }253 l.handleZkNodeEvent(zkEvent.Path, children, listener)254 case <-l.client.Done():255 logger.Warnf("client.done(), listen(path{%s}) goroutine exit now...", zkPath)256 return257 }258 }259}260func timeSecondDuration(sec int) time.Duration {261 return time.Duration(sec) * time.Second262}263// ListenServiceEvent is invoked by ZkConsumerRegistry::Register/ZkConsumerRegistry::get/ZkConsumerRegistry::getListener264// registry.go:Listen -> listenServiceEvent -> listenDirEvent -> ListenServiceNodeEvent265// |266// --------> ListenServiceNodeEvent267func (l *ZkEventListener) ListenServiceEvent(zkPath string, listener remoting.DataListener) {268 logger.Infof("listen dubbo path{%s}", zkPath)269 l.wg.Add(1)270 go func(zkPath string, listener remoting.DataListener) {271 l.listenDirEvent(zkPath, listener)272 logger.Warnf("listenDirEvent(zkPath{%s}) goroutine exit now", zkPath)273 }(zkPath, listener)274}275func (l *ZkEventListener) valid() bool {276 return l.client.ZkConnValid()277}278// Close ...279func (l *ZkEventListener) Close() {280 l.wg.Wait()281}...

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watcher.go

Source:watcher.go Github

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...70 emitter: emitterName,71 module: mType,72 }73}74// Listen make and return of event channel75// If channel not have readers, then will be runtime deadlock when buffer is full76func (w *Watcher) Listen() <-chan *event {77 if w.eventPipe == nil {78 w.eventPipe = make(chan *event, 30)79 }80 return w.eventPipe81}82// SetHandler set func to handle events from this watcher83func (w *Watcher) SetHandler(handler func(*event)) error {84 if handler == nil {85 return fmt.Errorf("handler is nil")86 }87 w.handler = handler88 return nil89}90func (w *Watcher) isListenType(head EventHead) bool {91 if len(w.subscribeEvents) == 0 {92 return true // Pass all event93 }94 for _, t := range w.subscribeEvents {95 if t == head {96 return true97 }98 }99 return false100}101type Manager struct {102 mu *sync.Mutex103 watchers map[string]*Watcher104 modulesTypes map[string]EventsMap105}106func NewWatcherManager() *Manager {107 return &Manager{108 mu: &sync.Mutex{},109 watchers: make(map[string]*Watcher),110 modulesTypes: make(map[string]EventsMap),111 }112}113// RegisterEvents register events list type for module, it will be used only for output from SupportEvents114func (w *Manager) RegisterEvents(moduleName string, events EventsMap) error {115 if _, ok := w.modulesTypes[moduleName]; ok {116 return fmt.Errorf("this module name already exist")117 }118 w.modulesTypes[moduleName] = events119 return nil120}121// SupportEvents returns the list of events which may be send by this module122func (w *Manager) SupportEvents(moduleName string) EventsMap {123 w.mu.Lock()124 defer w.mu.Unlock()125 return w.modulesTypes[moduleName]126}127// New return new watcher128// listenModule, listenModuleName, listenEvents can be empty129func (w *Manager) New(watcherName string, listenModule ModuleType, listenModuleName string, listenEvents ...EventHead) (*Watcher, error) {130 w.mu.Lock()131 defer w.mu.Unlock()132 if _, ok := w.watchers[watcherName]; ok {133 return nil, fmt.Errorf("watcher name '%s' already exist", watcherName)134 }135 wh := newWatcher(listenModule, listenModuleName, listenEvents...)136 w.watchers[watcherName] = wh137 return wh, nil138}139// MustNew return new watcher or panic140// listenModule, listenModuleName, listenEvents can be empty141func (w *Manager) MustNew(watcherName string, listenModule ModuleType, listenModuleName string, listenEvents ...EventHead) *Watcher {142 wh, err := w.New(watcherName, listenModule, listenModuleName, listenEvents...)143 if err != nil {144 panic(fmt.Errorf("watcher name '%s' already exist", watcherName))145 }146 return wh147}148// Emmit send event to watchers149func (w *Manager) Emmit(evt *event) error {150 if err := w.checkType(evt); err != nil {151 return err152 }153 w.mu.Lock()154 defer w.mu.Unlock()155 for _, wh := range w.watchers {156 if wh.module != "" && wh.module != evt.GetModuleType() {157 continue158 }159 if wh.emitter != "" && wh.emitter != evt.ModuleName {160 continue161 }162 if wh.isListenType(evt.EventHead) {163 if wh.eventPipe != nil {164 wh.eventPipe <- evt165 }166 if wh.handler != nil {167 wh.handler(evt)168 }169 }170 }171 return nil172}173func (w *Manager) checkType(evt *event) error {174 regT := evt.EventHead.(*eventHead).payloadType175 plT := reflect.TypeOf(evt.Payload)176 if regT != nil && regT != plT {...

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Listen

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1import (2type Event struct {3 listeners []func()4}5func (e *Event) Listen(listener func()) {6 e.listeners = append(e.listeners, listener)7}8func (e *Event) Fire() {9 for _, listener := range e.listeners {10 listener()11 }12}13func main() {14 e := &Event{}15 e.Listen(func() {16 fmt.Println("Hello")17 })18 e.Listen(func() {19 fmt.Println("World")20 })21 e.Fire()22}23import (24type Event struct {25 listeners []func()26}27func (e *Event) Listen(listener func()) {28 e.listeners = append(e.listeners, listener)29}30func (e *Event) Fire() {31 for _, listener := range e.listeners {32 listener()33 }34}35func main() {36 e := &Event{}37 e.Listen(func() {38 fmt.Println("Hello")39 })40 e.Listen(func() {41 fmt.Println("World")42 })43 e.Fire()44}45import (46type Event struct {47 listeners []func()48}49func (e *Event) Listen(listener func()) {50 e.listeners = append(e.listeners, listener)51}52func (e *Event) Fire() {53 for _, listener := range e.listeners {54 listener()55 }56}57func main() {58 e := &Event{}59 e.Listen(func() {60 fmt.Println("Hello")61 })62 e.Listen(func() {63 fmt.Println("World")64 })65 e.Fire()66}67import (68type Event struct {69 listeners []func()70}71func (e *Event) Listen(listener func()) {72 e.listeners = append(e.listeners, listener)73}74func (e *Event) Fire() {75 for _, listener := range e.listeners {76 listener()77 }78}79func main()

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Listen

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1import (2func main() {3 watcher, err := fsnotify.NewWatcher()4 if err != nil {5 fmt.Println("ERROR", err)6 }7 defer watcher.Close()8 done := make(chan bool)9 go func() {10 for {11 select {12 {13 fmt.Println("EVENT! ", event)14 }15 {16 fmt.Println("ERROR! ", err)17 }18 }19 }20 }()21 watcher.Add("C:/Users/DELL/Desktop/GoLang/Files/3.txt")22}23EVENT! {C:/Users/DELL/Desktop/GoLang/Files/3.txt CREATE}24EVENT! {C:/Users/DELL/Desktop/GoLang/Files/3.txt CHMOD}25EVENT! {C:/Users/DELL/Desktop/GoLang/Files/3.txt WRITE}26EVENT! {C:/Users/DELL/Desktop/GoLang/Files/3.txt CHMOD}27EVENT! {C:/Users/DELL/Desktop/GoLang/Files/3.txt WRITE}

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Listen

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1import (2var upgrader = websocket.Upgrader{3}4func serveWs(w http.ResponseWriter, r *http.Request) {5 fmt.Println("Websocket Endpoint Hit")6 upgrader.CheckOrigin = func(r *http.Request) bool { return true }7 ws, err := upgrader.Upgrade(w, r, nil)8 if err != nil {9 log.Println(err)10 }11 log.Println("Client Connected")12 reader(ws)13}14func reader(conn *websocket.Conn) {15 for {16 messageType, p, err := conn.ReadMessage()17 if err != nil {18 log.Println(err)19 }20 log.Printf("Message Received: %s21 if err := conn.WriteMessage(messageType, p); err != nil {22 log.Println(err)23 }24 }25}26func setupRoutes() {27 http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {28 fmt.Fprintf(w, "Hello World")29 })30 http.HandleFunc("/ws", serveWs)31}32func main() {33 fmt.Println("Go Websocket Tutorial")34 setupRoutes()35 http.ListenAndServe(":8080", nil)36}37import (38var upgrader = websocket.Upgrader{39}40func serveWs(w http.ResponseWriter, r *http.Request) {41 fmt.Println("Websocket Endpoint Hit")42 upgrader.CheckOrigin = func(r *http.Request) bool { return true }43 ws, err := upgrader.Upgrade(w, r, nil)44 if err != nil {45 log.Println(err)46 }47 log.Println("Client Connected")48 reader(ws)49}50func reader(conn *websocket.Conn) {51 for {52 messageType, p, err := conn.ReadMessage()53 if err != nil {54 log.Println(err)55 }56 log.Printf("Message Received: %s57 if err := conn.WriteMessage(messageType, p); err != nil {58 log.Println(err)

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Listen

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1import "fmt"2import "github.com/fsnotify/fsnotify"3func main() {4watcher, err := fsnotify.NewWatcher()5if err != nil {6fmt.Println("ERROR", err)7}8defer watcher.Close()9done := make(chan bool)10go func() {11for {12select {13fmt.Println("EVENT!", event)14if event.Op&fsnotify.Write == fsnotify.Write {15fmt.Println("modified file:", event.Name)16}17fmt.Println("ERROR", err)18}19}20}()21err = watcher.Add("/home/abc/xyz")22if err != nil {23fmt.Println("ERROR", err)24}25}26import "fmt"27import "github.com/fsnotify/fsnotify"28func main() {29watcher, err := fsnotify.NewWatcher()30if err != nil {31fmt.Println("ERROR", err)32}33defer watcher.Close()34done := make(chan bool)35go func() {36for {37select {38fmt.Println("EVENT!", event)39if event.Op&fsnotify.Write == fsnotify.Write {40fmt.Println("modified file:", event.Name)41}42fmt.Println("ERROR", err)43}44}45}()46err = watcher.Add("/home/abc/xyz")47if err != nil {48fmt.Println("ERROR", err)49}50}51import "fmt"52import "github.com/fsnotify/fsnotify"53func main() {54watcher, err := fsnotify.NewWatcher()55if err != nil {56fmt.Println("ERROR", err)57}58defer watcher.Close()59done := make(chan bool)60go func() {61for {62select {63fmt.Println("EVENT!", event)64if event.Op&fsnotify.Write == fsnotify.Write {65fmt.Println("modified file:", event.Name)66}67fmt.Println("ERROR", err)68}69}70}()71err = watcher.Add("/home/abc/xyz")72if err != nil {73fmt.Println("ERROR", err)74}75}76import "fmt"77import "github.com/fs

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Listen

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1import (2func main() {3 e := NewEvent()4 l := NewListener()5 e.Subscribe(l)6 e.Publish("Hello World")7 e.Unsubscribe(l)8 e.Publish("Hello World")9}10type Event struct {11}12func NewEvent() *Event {13 return &Event{14 listeners: make([]Listener, 0),15 }16}17func (e *Event) Subscribe(l Listener) {18 e.listeners = append(e.listeners, l)19}20func (e *Event) Unsubscribe(l Listener) {21 for i, v := range e.listeners {22 if v == l {23 e.listeners = append(e.listeners[:i], e.listeners[i+1:]...)24 }25 }26}27func (e *Event) Publish(data interface{}) {28 for _, v := range e.listeners {29 v.Update(data)30 }31}32type Listener interface {33 Update(data interface{})34}35func NewListener() Listener {36 return &ListenerClass{37 id: fmt.Sprintf("%d", time.Now().Unix()),38 }39}40type ListenerClass struct {41}42func (l *ListenerClass) Update(data interface{}) {43 fmt.Printf("Listener %s received: %v44}

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Listen

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1import "fmt"2func main() {3 e := event{}4 l := listener{}5 e.Listen(l)6 e.Fire()7}8type event struct {}9func (e event) Listen(l listener) {10 l.Handle()11}12func (e event) Fire() {13 fmt.Println("Fire method of event class")14}15type listener struct {}16func (l listener) Handle() {17 fmt.Println("Handle method of listener class")18}

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Listen

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1import (2type Event struct {3}4type EventListener struct {5}6func (e *EventListener) Listen() {7 for {8 fmt.Println(event)9 }10}11func main() {12 listener := &EventListener{13 Events: make(chan Event),14 }15 go listener.Listen()16 listener.Events <- Event{17 Time: time.Now(),18 }19}20{Hello 2020-07-01 14:33:43.209181 +0530 IST m=+0.000013052}

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Listen

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1import (2type Event struct {3 Callback func(e *fsm.Event)4}5func (ev *Event) Listen() {6 fmt.Println("Event: ", ev.Name, "Source: ", ev.Source, "Destination: ", ev.Destination)7}8import (9type Event struct {10 Callback func(e *fsm.Event)11}12func (ev *Event) Listen() {13 fmt.Println("Event: ", ev.Name, "Source: ", ev.Source, "Destination: ", ev.Destination)14}15func main() {16 f := fsm.NewFSM(17 fsm.Events{18 {Name: "warn", Src: []string{"green"}, Dst: "yellow"},19 {Name: "panic", Src: []string{"yellow", "red"}, Dst: "red"},20 {Name: "calm", Src: []string{"red"}, Dst: "yellow"},21 {Name: "clear", Src: []string{"yellow"}, Dst: "green"},22 },23 fsm.Callbacks{24 "before_warn": func(e *fsm.Event) { fmt.Println("before_warn:", e) },25 "leave_green": func(e *fsm.Event) { fmt.Println("leave_green:", e) },26 "enter_yellow": func(e *fsm.Event) { fmt.Println("enter_yellow:", e) },27 "after_warn": func(e *fsm.Event) { fmt.Println("after_warn:", e) },28 },29 fmt.Println(f.Current())30 err := f.Event("warn")31 if err != nil {32 fmt.Println(err)33 }

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Listen

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1import "fmt"2func main(){3 e := Event{}4 e.Listen("event1", func(data string){5 fmt.Println("Event1 is fired with data: ", data)6 })7 e.Fire("event1", "data1")8}9import "fmt"10func main(){11 e := Event{}12 e.Listen("event1", func(data string){13 fmt.Println("Event1 is fired with data: ", data)14 })15 e.Fire("event2", "data1")16}17import "fmt"18func main(){19 e := Event{}20 e.Listen("event1", func(data string){21 fmt.Println("Event1 is fired with data: ", data)22 })23 e.Fire("event1", "data1")24 e.Fire("event1", "data2")25}26import "fmt"27func main(){28 e := Event{}29 e.Listen("event1", func(data string){30 fmt.Println("Event1 is fired with data: ", data)31 })32 e.Fire("event1", "data1")33 e.Fire("event1", "data2")34 e.Remove("event1")35 e.Fire("event1", "data3")36}37import "fmt"38func main(){39 e := Event{}40 e.Listen("event1", func(data string){41 fmt.Println("Event1 is fired with data: ", data)42 })43 e.Fire("event1", "data1")44 e.Fire("event1", "data2")45 e.Remove("event1")46 e.Fire("event1", "data3")47 e.Listen("event1", func(data string){

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Listen

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1import (2type event struct {3}4func main() {5 eventList = append(eventList, event{time.Now(), "Event1"})6 eventList = append(eventList, event{time.Now(), "Event2"})7 eventList = append(eventList, event{time.Now(), "Event3"})8 eventList = append(eventList, event{time.Now(), "Event4"})9 eventList = append(eventList, event{time.Now(), "Event5"})10 eventList = append(eventList, event{time.Now(), "Event6"})11 eventList = append(eventList, event{time.Now(), "Event7"})12 eventList = append(eventList, event{time.Now(), "Event8"})13 eventList = append(eventList, event{time.Now(), "Event9"})14 eventList = append(eventList, event{time.Now(), "Event10"})15 for _, e := range eventList {16 go e.Listen()17 }18 time.Sleep(100 * time.Millisecond)19}20func (e event) Listen() {21 fmt.Println(e.what)22}23import (24type event struct {25}26func main() {27 eventList = append(eventList, event{time.Now(), "Event1"})28 eventList = append(eventList, event{time.Now(), "Event2"})29 eventList = append(eventList, event{time.Now(), "Event3"})30 eventList = append(eventList, event{time.Now(), "Event4"})31 eventList = append(eventList, event{time.Now(), "Event5"})32 eventList = append(eventList, event{time.Now(), "Event6"})33 eventList = append(eventList, event{time.Now(), "Event7"})34 eventList = append(eventList, event{time.Now(), "Event8"})35 eventList = append(eventList, event

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