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store_sink.go
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/
store_sink.go
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package gstream
import "context"
type storeSink[T any] struct {
FlowState
in chan interface{}
store func(context.Context, []T) error
batch int
}
func NewStoreSink[T any](batch int, store func(ctx context.Context, ts []T) error) StoreSink[T] {
sink := &storeSink[T]{
in: make(chan interface{}),
batch: batch,
store: store,
}
sink.init()
return sink
}
func (sink *storeSink[T]) init() {
go func() {
var ts []T
for elem := range sink.in {
ts = append(ts, elem.(T))
if len(ts) >= sink.batch {
err := sink.store(sink.Context(), ts)
if err != nil {
sink.SetStateErr(err)
}
ts = ts[0:0]
}
}
if len(ts) > 0 {
err := sink.store(sink.Context(), ts)
if err != nil {
sink.SetStateErr(err)
}
}
sink.Done()
}()
}
// In returns an input channel for receiving data
func (sink *storeSink[T]) In() chan<- interface{} {
return sink.in
}