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-rw-r--r--src/main/scala/xyz/driver/pdsuicommon/computation/Computation.scala124
1 files changed, 0 insertions, 124 deletions
diff --git a/src/main/scala/xyz/driver/pdsuicommon/computation/Computation.scala b/src/main/scala/xyz/driver/pdsuicommon/computation/Computation.scala
deleted file mode 100644
index a9430e3..0000000
--- a/src/main/scala/xyz/driver/pdsuicommon/computation/Computation.scala
+++ /dev/null
@@ -1,124 +0,0 @@
-package xyz.driver.pdsuicommon.computation
-
-import scala.concurrent.{ExecutionContext, Future}
-
-/**
- * Takes care of computations
- *
- * Success(either) - the computation will be continued.
- * Failure(error) - the computation was failed with unhandled error.
- *
- * Either[Result, T]:
- * Left(result) is a final and handled result, another computations (map, flatMap) will be ignored.
- * Right(T) is a current result. Functions in map/flatMap will continue the computation.
- *
- * Example:
- * {{{
- * import scala.concurrent.ExecutionContext.Implicits.global
- * import scala.concurrent.{ExecutionContext, Future}
- * import xyz.driver.pdsuicommon.computation.Computation
- *
- * def successful = for {
- * x <- Computation.continue(1)
- * y <- Computation.continue(2)
- * } yield s"\$x + \$y"
- *
- * // Prints "Success(1 + 2)"
- * successful.join.onComplete(print)
- *
- * def failed = for {
- * x <- Computation.abort("Failed on x")
- * _ = print("Second step")
- * y <- Computation.continue(2)
- * } yield s"\$x + \$y"
- *
- * // Prints "Success(Failed on x)"
- * failed.join.onComplete(print)
- * }}}
- *
- * TODO: Make future private
- *
- * @param future The final flow in a future.
- * @tparam R Type of result for aborted computation.
- * @tparam T Type of result for continued computation.
- */
-final case class Computation[+R, +T](future: Future[Either[R, T]]) {
-
- def flatMap[R2, T2](f: T => Computation[R2, T2])(implicit ec: ExecutionContext, ev: R <:< R2): Computation[R2, T2] = {
- Computation(future.flatMap {
- case Left(x) => Future.successful(Left(x))
- case Right(x) => f(x).future
- })
- }
-
- def processExceptions[R2](f: PartialFunction[Throwable, R2])(implicit ev1: R <:< R2,
- ec: ExecutionContext): Computation[R2, T] = {
- val strategy = f.andThen(x => Left(x): Either[R2, T])
- val castedFuture: Future[Either[R2, T]] = future.map {
- case Left(x) => Left(x)
- case Right(x) => Right(x)
- }
- Computation(castedFuture.recover(strategy))
- }
-
- def map[T2](f: T => T2)(implicit ec: ExecutionContext): Computation[R, T2] = flatMap { a =>
- Computation.continue(f(a))
- }
-
- def mapLeft[R2](f: R => R2)(implicit ec: ExecutionContext): Computation[R2, T] = {
- Computation(future.map {
- case Left(x) => Left(f(x))
- case Right(x) => Right(x)
- })
- }
-
- def mapAll[R2, T2](onLeft: R => Computation[R2, T2])(onRight: T => Computation[R2, T2])(
- onFailure: () => Computation[R2, T2])(implicit ec: ExecutionContext): Computation[R2, T2] = {
-
- Computation(future.flatMap(_.fold(onLeft, onRight).future).recoverWith {
- case _ => onFailure().future
- })
- }
-
- def andThen(f: T => Any)(implicit ec: ExecutionContext): Computation[R, T] = map { a =>
- f(a)
- a
- }
-
- def filter(f: T => Boolean)(implicit ec: ExecutionContext): Computation[R, T] = map { a =>
- if (f(a)) a
- else throw new NoSuchElementException("When filtering")
- }
-
- def withFilter(f: T => Boolean)(implicit ec: ExecutionContext): Computation[R, T] = filter(f)
-
- def foreach[T2](f: T => T2)(implicit ec: ExecutionContext): Unit = future.foreach {
- case Right(x) => f(x)
- case _ =>
- }
-
- def toFuture[R2](resultFormatter: T => R2)(implicit ec: ExecutionContext, ev: R <:< R2): Future[R2] = future.map {
- case Left(x) => x
- case Right(x) => resultFormatter(x)
- }
-
- def toFuture[R2](implicit ec: ExecutionContext, ev1: R <:< R2, ev2: T <:< R2): Future[R2] = future.map {
- case Left(x) => x
- case Right(x) => x
- }
-}
-
-object Computation {
-
- def continue[T](x: T): Computation[Nothing, T] = Computation(Future.successful(Right(x)))
-
- def abort[R](result: R): Computation[R, Nothing] = Computation(Future.successful(Left(result)))
-
- def fail(exception: Throwable): Computation[Nothing, Nothing] = Computation(Future.failed(exception))
-
- def fromFuture[T](input: Future[T])(implicit ec: ExecutionContext): Computation[Nothing, T] = Computation {
- input.map { x =>
- Right(x)
- }
- }
-}