viktorklang

/*
Copyright 2012-2021 Viktor Klang

   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

viktorklang

/*
Copyright 2018 Viktor Klang
 
   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

viktorklang

import scala.concurrent.duration._
import scala.concurrent.ExecutionContext
import scala.concurrent.Future
import akka.pattern.after
import akka.actor.Scheduler

/**
 * Given an operation that produces a T, returns a Future containing the result of T, unless an exception is thrown,
 * in which case the operation will be retried after _delay_ time, if there are more possible retries, which is configured through
 * the _retries_ parameter. If the operation does not succeed and there is no retries left, the resulting Future will contain the last failure.

eulerfx

Both command sourcing (CS) and event sourcing (ES) rely on determinism for correctness.

The correctness condition for ES is the determinism (purity) of the function State -> Event -> State. Given that this function is deterministic, aka it always maps the same inputs to the same ouputs, we can rely on it to reconstitute state at any point in time. Determinism is typically achieved by ensuring that the Event has all required information to make the state transition, ie no side effects. The Event then is a sort of "closure" of all pertinent information about the event.

The correctness condition for CS is the determinism of the function State -> Command -> Event. Herein lies one of the distinctions between command sourcing and event sourcing - a program can control its output, but it not its input. Since one can't control the input, aka command, one can't in general, enrich it with all required information to make the above function deterministic. A consequence of this is that you can't simply replay a

Geal

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#include <stdbool.h>
#include <time.h>
#include <stdarg.h>
#include <string.h>

#include "future.h"

rklaehn

package akkahttptest

import akka.http.Http
import akka.stream.ActorFlowMaterializer
import akka.actor.ActorSystem
import akka.stream.scaladsl.{Sink, Source}
import akka.http.model._

object TestClient extends App {

platy

import java.util.concurrent.ThreadPoolExecutor.AbortPolicy
import java.util.concurrent._

import scala.concurrent.{ Promise, Future }
import scala.concurrent.duration.FiniteDuration
import scala.language.implicitConversions
import scala.util.Try

object ScheduledExecutor {
  private val defaultHandler: RejectedExecutionHandler = new AbortPolicy

thomasst

"""
Copies all keys from the source Redis host to the destination Redis host.
Useful to migrate Redis instances where commands like SLAVEOF and MIGRATE are
restricted (e.g. on Amazon ElastiCache).

The script scans through the keyspace of the given database number and uses
a pipeline of DUMP and RESTORE commands to migrate the keys.

Requires Redis 2.8.0 or higher.

johanandren

import akka.actor.{Actor, ActorLogging, ActorSystem, Props}
import akka.cluster.Cluster
import akka.routing.FromConfig
import com.typesafe.config.ConfigFactory

import scala.concurrent.{Await, Future}
import scala.io.StdIn

object ClusteredRoundRobinPool extends App {

swsnr

import shapeless._
import shapeless.poly._
import shapeless.record._
import shapeless.ops.record._
import shapeless.ops.hlist.{Mapper,ToTraversable}
import shapeless.tag._

final case class Message(id: Int, title: String, body: String)

trait ToAttributes[T] {