20200419 MicroService POST And GET In Java Spark Tested Swift CommandLine Application

This is my test example for a microservice providing POST and GET tested with client command line application implemented in Swift.

The MicroService In Java Spark

    package de.wartbar.sparkserver;

    import spark.Request;
    import java.util.HashMap;
    import static spark.Spark.*;

    public class Main {

      private static final HashMap<String, String> map = new HashMap<>();

      private static String processGet(Request request) {
        synchronized (map) {
          String user = request.queryParams("user");
          System.out.println("GET request for content of user " + user + " : " +  map.get(user));
          return map.get(user);
        }
      }

      private static String processPost(Request request) {
        synchronized (map) {
          String user = request.queryParams("user");
          map.put(user, request.body());
          System.out.println("user " + user + " executed POST request : " + map.get(user));
          return "{ \"" + user + "\" : \"OK\" }";
        }
      }

      public static void main(String[] args) {
        get("/", (request, response) -> processGet(request));
        post("/", (request, response) -> processPost(request));
      }
    }

The CommandLine Client In Swift

    import Foundation

    var components = URLComponents()
    components.scheme = "http"
    components.host = "localhost"
    components.port = 4567
    components.path = "/"
    let parameter1 = URLQueryItem(name:"user", value:"andre")
    components.queryItems = [URLQueryItem]()
    components.queryItems!.append(parameter1)

    print("url :")
    print(components.url!)

    let sessionConfiguration = URLSessionConfiguration.default
    let session = URLSession(configuration: sessionConfiguration)
    let group = DispatchGroup()

    var json = [String:Any]()
    json["Value1"] = 1
    json["Value2"] = 2
    json["Value3"] = 3

    let data = try JSONSerialization.data(withJSONObject: json, options: [])

    var postRequest = URLRequest(url: components.url!)
    postRequest.httpMethod = "POST"
    postRequest.httpBody = data
    postRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
    postRequest.addValue("application/json", forHTTPHeaderField: "Accept")

    print("starting sync POST request")
    group.enter()
    session.dataTask(with: postRequest, completionHandler: {
        (data, response, error) in
        print("response data of POST : " + String(data: data!, encoding: .utf8)!)
        group.leave()
    }).resume()
    print("ending sync POST request")
    group.wait()

    var getRequest = URLRequest(url: components.url!)
    getRequest.setValue("application/json", forHTTPHeaderField: "Accept")
    getRequest.httpMethod = "GET"

    print("starting sync GET request")
    group.enter()
    session.dataTask(with: getRequest, completionHandler: {
        (data, response, error) in
        print("response data of GET : " + String(data: data!, encoding: .utf8)!)
        group.leave()
    }).resume()
    print("ending sync GET request")
    group.wait()