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Terminology, Concepts

In this chapter we attempt to establish a common terminology to define a solid ground for communicating about concurrent, distributed systems which Akka targets. Please note that, for many of these terms, there is no single agreed definition. We seek to give working definitions that will be used in the scope of the Akka documentation.

Concurrency vs. Parallelism

Concurrency and parallelism are related concepts, but there are small differences. Concurrency means that two or more tasks are making progress even though they might not be executing simultaneously. This can for example be realized with

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fun profileAwareConfig(): Config {
    val logger = LoggerFactory.getLogger("ProfileAwareConfig")
    val profiles = (System.getProperty("ktor.active.profiles") ?: "").split(",")

    val combinedConfig = profiles.fold(ConfigFactory.defaultApplication()) { config, profile ->
        val profileConfig = ConfigFactory.parseResourcesAnySyntax("application-$profile")
        profileConfig.withFallback(config)
    }

    if (logger.isDebugEnabled) {

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class Trie() {
    
    private data class Node(val children: MutableList<Node?> = MutableList(26) { null }, var leaf: Boolean = false)
    
    private val root = Node()

    /** Inserts a word into the trie. */
    fun insert(word: String) {
        var curr = root
        for(ch in word) {

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fun Double.round(places: Int) = BigDecimal(this).setScale(places, RoundingMode.HALF_EVEN).toDouble()

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• gpg --gen-key
• git config --global user.signingkey 0A46826A
• git config --global commit.gpgsign true (Optional, enable sign always)
• git commit -S -m "foobar (Optional, for manual sign commit)
• Copy output of git --armor --export 0A46826A to github/gitlab settings etc
• Have fun

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unix = powershell

which = Get-Command or gcm

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fun Project.configurePublishing(artifactId: String, android: Boolean = false) {
    var publishingExtension: PublishingExtension? = null
    apply<MavenPublishPlugin>()
    apply<SigningPlugin>()
    configure<PublishingExtension> {
        publishingExtension = this
        publications {
            create<MavenPublication>("mavenRelease") {
                this.artifactId = artifactId
                if (android) {

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package com.expedia.ord.recon

import java.util.*

fun main(args: Array<String>) {
  val helloApp = HelloApp()
  helloApp.work()
  helloApp.funstuff("skiing")
  try {
    val asd = helloApp.otherstuff(10)

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import 'package:flutter/material.dart';

typedef void OnPressed(String id);

class FancyFab extends StatefulWidget {
  final OnPressed onPressed;

  FancyFab({@required this.onPressed});

  @override

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Future<T> showNestedMenu<T>(
    {@required BuildContext context,
    @required GlobalKey<State> popupButtonKey,
    @required List<PopupMenuEntry<T>> items}) async {
  final RenderBox popupButtonObject =
      popupButtonKey.currentContext.findRenderObject();
  final RenderBox overlay = Overlay.of(context).context.findRenderObject();

  final position = RelativeRect.fromRect(
      Rect.fromPoints(