Initial work on getting minimal API to work

AS1024.GeoFeed.Core/GeoFeedPreloader/PreloadGeoFeed.cs

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+using AS1024.GeoFeed.Core.Interfaces;
+using AS1024.GeoFeed.Models;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace AS1024.GeoFeed.Core.GeoFeedPreloader
+{
+    public class PreLoadGeoFeed : IHostedService
+    {
+        private readonly ILogger<PreLoadGeoFeed> logger;
+        private readonly IGeoFeedProvider provider;
+        private readonly IMemoryCache memoryCache;
+        private readonly IHostEnvironment environment;
+        private const string GeoFeedCacheKey = "GeoFeedData";
+
+        public PreLoadGeoFeed(ILogger<PreLoadGeoFeed> logger,
+            IGeoFeedProvider provider,
+            IMemoryCache memoryCache,
+            IHostEnvironment environment)
+        {
+            this.logger = logger;
+            this.provider = provider;
+            this.memoryCache = memoryCache;
+            this.environment = environment;
+        }
+
+        async Task IHostedService.StartAsync(CancellationToken cancellationToken)
+        {
+            try
+            {
+                if (environment.IsProduction())
+                    await StartPreLoad();
+            }
+            catch (Exception ex)
+            {
+                logger.LogWarning($"Failed to preload, exception settings below:\n{ex}");
+            }
+        }
+
+        private async Task StartPreLoad()
+        {
+            logger.LogInformation("Preloading GeoFeed data in memory...");
+            List<IPGeoFeed> feed = await provider.GetGeoFeedData();
+            MemoryCacheEntryOptions cacheEntryOptions = new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromMinutes(45));
+            memoryCache.Set(GeoFeedCacheKey, feed, cacheEntryOptions);
+        }
+
+        Task IHostedService.StopAsync(CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+    }
+}