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• ApiFutureHandler.scala

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orcus.bigtable.async.ApiFutureHandler.scala Maven / Gradle / Ivy

package orcus.bigtable.async

import cats.syntax.either.*
import cats.~>
import com.google.api.core.ApiFuture
import com.google.api.core.ApiFutureCallback
import com.google.api.core.ApiFutures
import com.google.common.util.concurrent.MoreExecutors
import orcus.async.AsyncHandler
import orcus.async.Par

trait ApiFutureHandler {

  implicit def handleGoogleApiFuture[F[_]](implicit F: AsyncHandler[F]): Par.Aux[ApiFuture, F] =
    new Par[ApiFuture] {
      type G[α] = F[α]

      def parallel: ApiFuture ~> F = new (ApiFuture ~> F) {
        def apply[A](f: ApiFuture[A]): F[A] =
          F.handle[A](
            cb =>
              ApiFutures.addCallback(
                f,
                new ApiFutureCallback[A] {
                  def onFailure(t: Throwable): Unit = cb(t.asLeft)
                  def onSuccess(a: A): Unit         = cb(a.asRight)
                },
                MoreExecutors.directExecutor()
              ),
            f.cancel(true)
          )
      }
    }
}