Fristi’s gists

Fristi / profiling.txt

Created May 6, 2020 09:34

scalac-profiling

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	Compiling postgres (14 Scala sources)
	[E-1] xsbt-analyzer : 1 spans, ()6.485ms (0.0%)
	[E-1] silencerCheckUnused : 1 spans, ()0.083ms (0.0%)
	[E-1] scalacenter-profiling : 1 spans, ()3581.37ms (5.1%)
	[E-1] semanticdb-jvm : 1 spans, ()0.271ms (0.0%)
	[E-1] jvm : 1 spans, ()977.622ms (1.4%)
	[E-1] delambdafy : 1 spans, ()100.727ms (0.1%)
	[E-1] cleanup : 1 spans, ()96.443ms (0.1%)
	[E-1] mixin : 1 spans, ()94.082ms (0.1%)
	[E-1] flatten : 1 spans, ()60.325ms (0.1%)

Fristi / OT2.scala

Last active April 28, 2020 15:59

Improved zio-telemetry OpenTracing

	package zio.telemetry.opentracing

	import java.util.concurrent.TimeUnit

	import io.opentracing.{Span, Tracer}
	import zio.clock.Clock
	import zio._

	object OpenTracing2 {
	type OT = Has[Service]

Fristi / DiffableDerivation.scala

Created November 28, 2018 07:37

specs2 `Diffable` magnolia derivation

	import magnolia.{CaseClass, Magnolia, SealedTrait}
	import org.specs2.matcher.describe._

	import scala.language.experimental.macros

	object DiffableDerivation {

	/** binds the Magnolia macro to this derivation object */
	implicit def genDiffable[T]: Diffable[T] = macro Magnolia.gen[T]

Fristi / Service.scala

Created November 7, 2018 07:13

Http4s refined endpoint with tests

	import cats.Show
	import cats.data.EitherT
	import cats.effect.{IO, Sync}
	import eu.timepit.refined.api.Refined
	import eu.timepit.refined.collection.NonEmpty
	import eu.timepit.refined.types.numeric.PosInt
	import io.chrisdavenport.log4cats.Logger
	import io.chrisdavenport.log4cats.slf4j.Slf4jLogger
	import io.circe._
	import io.circe.refined._

Fristi / Xenolittle.scala

Created September 5, 2018 22:29

Simple Schema implementation derived from Xenomorph to practice around with all the concepts

	import jason.HFunctor.HAlgebra
	import scalaz._
	import scalaz.Scalaz._
	import io.circe._

	trait HFunctor[F[_[_], _]] {
	def hfmap[M[_], N[_]](nt: M ~> N): F[M, ?] ~> F[N, ?]
	}

	object HFunctor {

Fristi / HFix.scala

Last active September 5, 2018 14:23

Higher order fix point types. Porting http://www.timphilipwilliams.com/posts/2013-01-16-fixing-gadts.html

	import scalaz._
	import scalaz.Scalaz._

	trait HFunctor[F[_[_], _]] {
	def hfmap[M[_], N[_]](nt: M ~> N): F[M, ?] ~> F[N, ?]
	}

	object HFunctor {
	def apply[F[_[_], _]](implicit v: HFunctor[F]) = v

Fristi / MockitoScalaMagic.scala

Created July 4, 2017 08:57

Workaround for Mockito's issue with mocking AnyVal as described here: https://stackoverflow.com/questions/27289757/mockito-matchers-scala-value-class-and-nullpointerexception - requires shapeless

	import org.mockito.ArgumentMatchers.{eq => is}
	import shapeless.ops.hlist.IsHCons
	import shapeless._

	trait MockitoScalaMagic {
	def isAnyVal[A <: AnyVal, V, VN <: HList](
	v: A
	)(implicit LB: Generic.Aux[A, VN], ev: IsHCons.Aux[VN, V, HNil], same: (V :: HNil) =:= VN): A =
	LB.from(is(ev.head(LB.to(v))) :: HNil)

Fristi / EitherT.scala

Created May 19, 2017 12:51

Simple EitherT monad transformer example


	import scala.concurrent.ExecutionContext.Implicits.global
	import scala.concurrent.duration._
	import scala.concurrent.{Await, Future}
	import scalaz.Scalaz._
	import scalaz._

	case class Person(name: String, age: Int, teamId: Int)
	case class Team(name: String)

Fristi / Mapping.scala

Last active April 10, 2017 10:18

Mapping type class


	import shapeless._
	import shapeless.labelled.{ FieldType, field }

	import scala.reflect.ClassTag
	import scala.util.control.NonFatal
	import scalaz.Scalaz._
	import scalaz.{ DLeft, DRight, Disjunction }

	/**

Fristi / Optics.scala

Created January 1, 2017 13:30

Accessing elements via optics in a Map[String, Any]

	package maps

	import monocle._
	import monocle.std.map._
	import monocle.function.all._

	import scala.reflect.ClassTag

	object Test extends App {

Mark Fristi