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ndeg.fetch_sjs0.6_2.12.0.4.0.source-code.implicits.scala Maven / Gradle / Ivy
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Simple & Efficient data access for Scala and Scala.js
/*
* Copyright 2016 47 Degrees, LLC.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package fetch
import cats.MonadError
import cats.instances.future._
import scala.concurrent.{Promise, Future, ExecutionContext}
object implicits {
implicit def fetchFutureFetchMonadError(
implicit ec: ExecutionContext
): FetchMonadError[Future] =
new FetchMonadError.FromMonadError[Future] {
override def runQuery[A](j: Query[A]): Future[A] = j match {
case Sync(e) => Future(e.value)
case Async(ac, timeout) => {
val p = Promise[A]()
ec.execute(new Runnable {
def run() = ac(p.trySuccess _, p.tryFailure _)
})
p.future
}
case Ap(qf, qx) =>
runQuery(qf).zip(runQuery(qx)).map { case (f, x) => f(x) }
}
}
}
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