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filosganga / RoundRobinIterable.java
Last active May 13, 2023 07:50
It implements an Iterable that take elements from a list of Iterable in a round robin fashion. The test is most explicative than the description.
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.collect.Iterables.filter;
import static com.google.common.collect.Iterators.cycle;
import static java.util.Arrays.asList;
import java.util.Iterator;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.FluentIterable;
{
"type" : "record",
"name" : "TimeExamples",
"namespace": "com.example",
"fields" : [
{
"name": "aDate",
"type": "int"
"logicalType": "date"
},
@filosganga
filosganga / JsonTagger.scala
Last active October 27, 2021 06:23
The JSON tagger allows to decode an ADT encoded in JSON avoiding the focus to switch to a different branch
import io.circe._
import io.circe.generic.semiauto._
import cats.syntax.all._
object JsonTagger {
private implicit class Tagger[A](d: Decoder[A]) {
def tag(accessor: String): Decoder[Decoder[A]] =
Decoder
@filosganga
filosganga / GuavaFutures.scala
Created September 16, 2017 06:25
How to convert a Guava ListeanbelFuture to Cats Async
import cats.effect.Async
import com.google.common.util.concurrent.{FutureCallback, Futures, ListenableFuture}
import scala.concurrent.ExecutionContext
object GuavaFutures {
implicit class RichListenableFuture[T](lf: ListenableFuture[T]) {
def toAsync[F[_]: Async](implicit ec: ExecutionContext): F[T] = {
@filosganga
filosganga / Memoize.scala
Last active March 5, 2020 20:16
Computational memoization
import cats._
import cats.implicits._
import cats.effect._
import cats.effect.concurrent._
import cats.effect.implicits._
trait Memoize[F[_], Key, A] {
def get(id: Key): F[A]
}
@filosganga
filosganga / Queue.scala
Created February 25, 2020 22:12
Several effectful Queue implementation using cats-effect
import cats.data._
import cats.implicits._
import cats.effect._
import cats.effect.concurrent._
trait Queue[F[_], A] {
def enqueue(a: A): F[Unit]
def dequeue: F[A]
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you 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
*
@filosganga
filosganga / ResourceMapStage.scala
Last active March 23, 2017 10:51
A map stage that control a resource lifecycle.
import akka.stream.ActorAttributes.SupervisionStrategy
import akka.stream._
import akka.stream.stage.{GraphStage, GraphStageLogic, InHandler, OutHandler}
import scala.util.control.NonFatal
class ResourceMapStage[In, Out, R](opener: () => R, closer: R => Unit, f: R => In ⇒ Out) extends GraphStage[FlowShape[In, Out]] {
val in = Inlet[In]("ResourceMap.in")
val out = Outlet[Out]("ResourceMap.out")
@filosganga
filosganga / Contact.java
Last active December 9, 2016 17:30
GWT RPC Spring Scaffolding
package org.filippodeluca.gwt.examples.contacts;
import com.google.gwt.user.client.rpc.IsSerializable;
public class Contact implements IsSerializable {
private String name;
private String email;
public Contact(String name, String email) {

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