Go 实现的轻量级的事件管理、调度工具库

• 支持自定义定义事件对象
• 支持对一个事件添加多个监听器
• 支持设置事件监听器的优先级，优先级越高越先触发
• 支持根据事件名称前缀 PREFIX.* 来进行一组事件监听.
  • 注册app.* 事件的监听，触发 app.run app.end 时，都将同时会触发 app.* 事件
• 支持使用通配符 * 来监听全部事件的触发
• 完善的单元测试，单元覆盖率 > 95%

主要方法

• On/Listen(name string, listener Listener, priority ...int) 注册事件监听
• Subscribe/AddSubscriber(sbr Subscriber) 订阅，支持注册多个事件监听
• Trigger/Fire(name string, params M) (error, Event) 触发事件
• MustTrigger/MustFire(name string, params M) Event 触发事件，有错误则会panic
• FireEvent(e Event) (err error) 根据给定的事件实例，触发事件
• FireBatch(es ...interface{}) (ers []error) 一次触发多个事件
• AsyncFire(e Event) Async fire event by 'go' keywords

快速使用

package main

import (
	"fmt"
	
	"github.com/gookit/event"
)

func main() {
	// 注册事件监听器
	event.On("evt1", event.ListenerFunc(func(e event.Event) error {
        fmt.Printf("handle event: %s\n", e.Name())
        return nil
    }), event.Normal)
	
	// 注册多个监听器
	event.On("evt1", event.ListenerFunc(func(e event.Event) error {
        fmt.Printf("handle event: %s\n", e.Name())
        return nil
    }), event.High)
	
	// ... ...
	
	// 触发事件
	// 注意：第二个监听器的优先级更高，所以它会先被执行
	event.MustFire("evt1", event.M{"arg0": "val0", "arg1": "val1"})
}

编写事件监听

使用匿名函数

package mypgk

import (
	"fmt"
	
	"github.com/gookit/event"
)

var fnHandler = func(e event.Event) error {
	fmt.Printf("handle event: %s\n", e.Name())
    return nil
}

func Run() {
    // register
    event.On("evt1", event.ListenerFunc(fnHandler), event.High)
}

使用结构体方法

interface:

// Listener interface
type Listener interface {
	Handle(e Event) error
}

示例:

实现接口 event.Listener

package mypgk

import (
	"fmt"
	
	"github.com/gookit/event"
)

type MyListener struct {
	// userData string
}

func (l *MyListener) Handle(e event.Event) error {
	e.Set("result", "OK")
	return nil
}

同时注册多个事件监听

interface:

// Subscriber event subscriber interface.
// you can register multi event listeners in a struct func.
type Subscriber interface {
	// SubscribedEvents register event listeners
	// key: is event name
	// value: can be Listener or ListenerItem interface
	SubscribedEvents() map[string]interface{}
}

示例

实现接口 event.Subscriber

package mypgk

import (
	"fmt"
	
	"github.com/gookit/event"
)

type MySubscriber struct {
	// ooo
}

func (s *MySubscriber) SubscribedEvents() map[string]interface{} {
	return map[string]interface{}{
		"e1": event.ListenerFunc(s.e1Handler),
		"e2": event.ListenerItem{
			Priority: event.AboveNormal,
			Listener: event.ListenerFunc(func(e Event) error {
				return fmt.Errorf("an error")
			}),
		},
		"e3": &MyListener{},
	}
}

func (s *MySubscriber) e1Handler(e event.Event) error {
	e.Set("e1-key", "val1")
	return nil
}

编写自定义事件

interface:

// Event interface
type Event interface {
	Name() string
	// Target() interface{}
	Get(key string) interface{}
	Add(key string, val interface{})
	Set(key string, val interface{})
	Data() map[string]interface{}
	SetData(M) Event
	Abort(bool)
	IsAborted() bool
}

示例

package mypgk 

import (
	"fmt"
	
	"github.com/gookit/event"
)

type MyEvent struct{
	event.BasicEvent
	customData string
}

func (e *MyEvent) CustomData() string {
    return e.customData
}

使用：

e := &MyEvent{customData: "hello"}
e.SetName("e1")
event.AddEvent(e)

// add listener
event.On("e1", event.ListenerFunc(func(e event.Event) error {
   fmt.Printf("custom Data: %s\n", e.(*MyEvent).CustomData())
   return nil
}))

// trigger
event.Fire("e1", nil)
// OR
// event.FireEvent(e)

github 地址：https://github.com/gookit/event