Merge branch 'master' of github.com:drivergroup/driver-core

1 files changed, 45 insertions, 0 deletions

diff --git a/src/main/scala/xyz/driver/core/execution.scala b/src/main/scala/xyz/driver/core/execution.scala
new file mode 100644
index 0000000..0cf92fd
--- /dev/null
+++ b/src/main/scala/xyz/driver/core/execution.scala
@@ -0,0 +1,45 @@
+package xyz.driver.core
+
+import scala.concurrent.{ExecutionContext, Future}
+import scalaz.OptionT
+
+object execution {
+
+  implicit class FutureOptionTExtensions[T](future: Future[T])(implicit executionContext: ExecutionContext) {
+
+    def toOptionT: OptionT[Future, T] =
+      OptionT.optionT[Future](future.map(value => Option(value)))
+
+    def returnUnit: Future[Unit] =
+      future.map(_ => Option(()))
+
+    def returnUnitOpt: OptionT[Future, Unit] =
+      OptionT.optionT[Future](future.map(_ => Option(())))
+
+    def andEffect[E](effect: Future[E]): Future[T] =
+      for {
+        result <- future
+        _      <- effect
+      } yield result
+
+    def andEffect[E](effect: OptionT[Future, E]): Future[T] =
+      andEffect(effect.run)
+  }
+
+  def illegalState[T](message: String): OptionT[Future, T] =
+    failure[T](new IllegalStateException(message))
+
+  def illegalArgument[T](message: String): OptionT[Future, T] =
+    failure[T](new IllegalArgumentException(message))
+
+  def failure[T](throwable: Throwable): OptionT[Future, T] =
+    OptionT.optionT(Future.failed[Option[T]](throwable))
+
+  def collectOrNone[T, R](value: T)(f: PartialFunction[T, OptionT[Future, R]]): OptionT[Future, R] =
+    f.lift(value).getOrElse(OptionT.optionT(Future.successful(Option.empty[R])))
+
+  def collectOrDoNothing[T](value: T)(f: PartialFunction[T, OptionT[Future, Unit]]): OptionT[Future, Unit] =
+    f.lift(value).getOrElse(doNothing)
+
+  val doNothing = OptionT.optionT(Future.successful(Option(())))
+}