Real Web Developers

MemoryCache

namespace RealWebDevelopers;

public class Provider
{
    private readonly IMemoryCache memoryCache;
    private readonly MemoryCacheEntryOptions memoryCacheEntryOptions = new MemoryCacheEntryOptions
    {
        AbsoluteExpirationRelativeToNow = TimeSpan.FromMinutes(60); // Cache for 1 hour
    }

    public Provider(IMemoryCache memoryCache)
    {
        this.memoryCache = memoryCache;
    }

    public IEnumberable<Product> GetProducts()
    {
        var cacheKey = "product";
        if (!this.memoryCache.TryGetValue(cacheKey, out List<Product> productCache))
        {
            try
            {
                // Fetch the data from source i.e. Database query
                var products = this.session.Query<Product>();
                this.memoryCache.Set(cacheKey, products, this.memoryCacheEntryOptions);
                return products;
            }
            catch
            {
                // Whatever
            }
        }

        return productCache;
    }
}

Service collection Jaeger

namespace RealWebDevelopers;

using Microsoft.Extensions.Options;
using OpenTelemetry.Resources;
using OpenTelemetry.Trace;

public class Program
{
    public static void Main(string[] args)
    {
        // boiler plate web application
        builder.Services.AddOpenTelemetry()
            .WithTracing(configure =>
            {
                configure.SetResourceBuilder(ResourceBuilder.CreateDefault().AddService(builder.Environment.ApplicationName))
                    .AddAspNetCoreInstrumentation()
                    .AddHttpClientInstrumentation()
                    .AddSource(builder.Environment.ApplicationName)
                    .AddOtlpExporter(config => { config.Endpoint = new Uri("http://localhost:4317"); });
            });

        // etc.
    }
}

Case-insensitive Dictionary access in C#

namespace RealWebDevelopers;

using System;
using System.Collections.Generic;

public static class Program
{
  private static readonly Dictionary cache = new(StringComparer.OrdinalIgnoreCase)
  {
    {
      "dog", "woof"
    },
    {
      "cat", "meow"
    };
  };

  public static void Main(string[] args)
  {
    Console.Write(cache.GetValueOrDefault("dog"));
    Console.Write(cache.GetValueOrDefault("Dog"));
  }
}
  

Service Collection RabbitMQ extension

namespace RealWebDevelopers;

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using RabbitMQ.Client;

public static class Extensions
{
    public static void AddRabbitMq(this ServiceCollection services)
    {
        services.AddSingleton(implementationFactory =>
        {
            return new ConnectionFactory
            {
                HostName = implementationFactory.GetRequiredService>().Value.Host,
            }.CreateConnectionAsync().Result;
        });
        return services;
    }
}