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package operator
import (
"context"
"goflink/core"
)
type KeySelector[IN any] func(in IN) string
type KeyByOperator[IN any] struct {
selector KeySelector[IN]
}
func NewKeyByOperator[IN any](selector KeySelector[IN]) *KeyByOperator[IN] {
return &KeyByOperator[IN]{selector: selector}
}
func (k *KeyByOperator[IN]) Open(ctx context.Context) error {
return nil
}
func (k *KeyByOperator[IN]) Process(ctx context.Context, record core.StreamRecord[IN], out Emitter[IN]) error {
if record.Type != core.RecordData {
return out.Emit(ctx, record)
}
record.Key = k.selector(record.Value)
return out.Emit(ctx, record)
}
func (k *KeyByOperator[IN]) Close(ctx context.Context) error {
return nil
}
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