sw-samuraj

(defn wrap-blank-middleware
  "Blank middleware demonstrating common structure."
  [handler]
  (fn [request]
    ; Do some magic with the request
    (let [response (handler request)]
      ; Do some magic with the response
      ; and return the response.
      response)))

sw-samuraj

import com.google.common.collect.ImmutableList;

interface Powerful {}
class Jedi implements Powerful {}
class Sith implements Powerful {}

public class ImmutableListInvariance {
    public static void main(String[] args) {
        ImmutableList<Jedi> jedi = ImmutableList.of(new Jedi());
        // ImmutableList<Powerful> powerfuls = jedi;   // Error

sw-samuraj

trait Powerful
class Jedi extends Powerful
class Sith extends Powerful

object ListCovariance {
  def main(args: Array[String]): Unit = {
    val jedi: List[Jedi] = List(new Jedi)
    val powerfuls: List[Powerful] = jedi
    val morePowerfuls = new Sith :: powerfuls
  }

sw-samuraj

import java.util.LinkedList;
import java.util.List;

interface Powerful {}
class Jedi implements Powerful {}
class Sith implements Powerful {}

public class ListInvariance {
    public static void main(String[] args) {
        List<Jedi> jedi = new LinkedList<>();

sw-samuraj

trait Powerful
class Jedi extends Powerful
class Sith extends Powerful

object ArrayInvariance {
  def main(args: Array[String]): Unit = {
    val jedi: Array[Jedi] = Array(new Jedi)
    val powerfuls: Array[Powerful] = jedi   // Error
    powerfuls(0) = new Sith
    val hybrid: Jedi = jedi(0)

sw-samuraj

interface Powerful {}
class Jedi implements Powerful {}
class Sith implements Powerful {}

public class ArrayCovariance {
    public static void main(String[] args) {
        Jedi[] jedi = new Jedi[] { new Jedi() };
        Powerful[] powerfuls = jedi;
        powerfuls[0] = new Sith();
        Jedi hybrid = jedi[0];

sw-samuraj

{
  "sourceFolder": "",
  "modelPackage": "cz.swsamuraj.rest.contractfirst.ws.model",
  "apiPackage":   "cz.swsamuraj.rest.contractfirst.ws.api",
  "interfaceOnly": true
}

sw-samuraj

plugins {
    id 'org.hidetake.swagger.generator' version '2.4.2'
}

repositories {
    mavenCentral()
}

dependencies {
    compile 'io.swagger:swagger-annotations:1.5.10'

sw-samuraj

swagger: "2.0"

info:
  version: "0.1.0"
  title: "The Ultimate Question."

paths:
  /question:
    get:
      summary: "Asks the ultimate question"

sw-samuraj

(ns blog-ring.core
  (:require [ring.adapter.jetty :as jetty]
            [ring.util.response :refer [response]]
            [ring.middleware.params :refer [wrap-params]]
            [ring.middleware.keyword-params :refer [wrap-keyword-params]]))

(defn handler [request]
  (response
    (str "<h1>One Ring rules them all!</h1>"
          "<ul><li>Query string: "