46 lines
1011 B
Go
46 lines
1011 B
Go
package event
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import (
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"errors"
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"reflect"
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)
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type HandlerInst interface {
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Default(event any) (err error)
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}
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type OnStart struct{}
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type OnLoopCycle struct{}
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var HandlerDone = errors.New("handler done")
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func FindHandlers(inst HandlerInst) (handlers map[reflect.Type]reflect.Value) {
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handlers = make(map[reflect.Type]reflect.Value)
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t := reflect.TypeOf(inst)
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v := reflect.ValueOf(inst)
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for i := 0; i < t.NumMethod(); i++ {
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method := t.Method(i)
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if method.Type.NumIn() != 2 || method.Type.NumOut() != 1 {
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continue
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}
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if method.Type.Out(0) != reflect.TypeFor[error]() {
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continue
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}
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eventType := method.Type.In(1)
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handlers[eventType] = v.Method(i)
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}
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return
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}
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func Fire(inst HandlerInst, event any, handlers map[reflect.Type]reflect.Value) (err error) {
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if handler, ok := handlers[reflect.TypeOf(event)]; ok {
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errV := handler.Call([]reflect.Value{reflect.ValueOf(event)})[0]
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if !errV.IsNil() {
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err = errV.Interface().(error)
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}
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} else {
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err = inst.Default(event)
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}
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return
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}
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