Smelly Locks (C#)

Attention.md

Smelly Locks (C#)

• Create a Console app project.
• Make Sure that the code compiles and runs.
• If you are within a proxy, you can do it programmatically like this:

  System.Net.WebRequest.DefaultWebProxy = new WebProxy(ip,port); 
  

Request.cs

using System;
using System.Net;
using System.Threading;

class Request : IDisposable {
  private string data;
  private Exception exception;
  private readonly string url;
  private readonly ReaderWriterLockSlim rwlockSlim;

  public Request(string url) {
    rwlockSlim = new ReaderWriterLockSlim();
    this.url = url;
  }
  
  public void Dispose() {
    rwlockSlim.Dispose();
  }
  
  private void BypassAllCertificates() {
    ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain,error) => true;
  }
  
  private string Send(string url) {
    using (WebClient wc = new WebClient()) {
      BypassAllCertificates();
      return wc.DownloadString(url);
    }
  }	

  public void Run() {
    rwlockSlim.EnterWriteLock();
    try {
      Console.WriteLine($"Running({url}) on => {Thread.CurrentThread}({Thread.CurrentThread.Name})");
      data = Send(url);
    } catch(Exception e) {
      this.exception = e;
    } finally {
      rwlockSlim.ExitWriteLock();
    }
  }

  public string Get() {
    rwlockSlim.EnterReadLock();
    try {
      if (exception == null)
        return data;
      
      throw exception;
    } finally {
      rwlockSlim.ExitReadLock();
    }
  }
}

Runner.cs

using System;
using System.Threading;
using System.Diagnostics;

public class Runner {
  public static void Main(string[] args) {
    var placesNearbyUrl = "https://geographic-services.herokuapp.com/places/nearby?lat=19.01&lon=72.8&radius=25&unit=km";
    var weatherUrl = "https://geographic-services.herokuapp.com/weather?lat=19.01&lon=72.8";
    using (var placesNearbyRequest = new Request(placesNearbyUrl)) {
      using(var weatherRequest = new Request(weatherUrl)) {
        
        var placesNearbyThread = new Thread(() => placesNearbyRequest.Run());
        placesNearbyThread.Name = "placesNearby";
        var weatherThread = new Thread(() => weatherRequest.Run());
        weatherThread.Name = "weather";

        var watch = Stopwatch.StartNew();
        placesNearbyThread.Start();
        weatherThread.Start();
        do {
          Console.WriteLine("==========> Waiting For Results.... <==========");
          Thread.Sleep(100);
        } while (placesNearbyRequest.Get() == null && weatherRequest.Get() == null);
    	
        watch.Stop();
        Console.WriteLine($"Time Taken {watch.ElapsedMilliseconds}(ms)");
        string placesNearbyAndWeatherData = $@"{{ ""weather"" : {weatherRequest.Get()}, ""placesNearby"": {placesNearbyRequest.Get()} }}";
        Console.WriteLine(placesNearbyAndWeatherData);
      }
    }
  }
}