Rename file

AS1024.GeoFeed/GeoFeedBuilder/PreloadGeoFeed.cs

@@ -0,0 +1,36 @@
+
+using AS1024.GeoFeed.Interfaces;
+using Microsoft.Extensions.Caching.Memory;
+
+namespace AS1024.GeoFeed.GeoFeedBuilder
+{
+    public class PreLoadGeoFeed : IHostedService
+    {
+        private readonly ILogger<PreLoadGeoFeed> logger;
+        private readonly IGeoFeedProvider provider;
+        private readonly IMemoryCache memoryCache;
+        private const string GeoFeedCacheKey = "GeoFeedData";
+
+        public PreLoadGeoFeed(ILogger<PreLoadGeoFeed> logger,
+            IGeoFeedProvider provider,
+            IMemoryCache memoryCache)
+        {
+            this.logger = logger;
+            this.provider = provider;
+            this.memoryCache = memoryCache;
+        }
+
+        async Task IHostedService.StartAsync(CancellationToken cancellationToken)
+        {
+            logger.LogInformation("Preloading GeoFeed data in memory...");
+            var feed = await provider.GetGeoFeedData();
+            var cacheEntryOptions = new MemoryCacheEntryOptions().SetAbsoluteExpiration(TimeSpan.FromMinutes(45));
+            memoryCache.Set(GeoFeedCacheKey, feed, cacheEntryOptions);
+        }
+
+        Task IHostedService.StopAsync(CancellationToken cancellationToken)
+        {
+            return Task.CompletedTask;
+        }
+    }
+}