Add DistributedCacheEventStreamStore (#1136)

Co-authored-by: Stephen Halter <halter73@gmail.com>

tests/ModelContextProtocol.AspNetCore.Tests/DistributedCacheResumabilityIntegrationTests.cs

@@ -0,0 +1,49 @@
+using Microsoft.Extensions.Caching.Distributed;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using ModelContextProtocol.Server;
+
+namespace ModelContextProtocol.AspNetCore.Tests;
+
+/// <summary>
+/// Integration tests for SSE resumability using <see cref="DistributedCacheEventStreamStore"/>.
+/// </summary>
+/// <remarks>
+/// <para>
+/// This class runs the same resumability tests as <see cref="ResumabilityIntegrationTests"/> but
+/// using the production <see cref="DistributedCacheEventStreamStore"/> implementation backed by
+/// an in-memory distributed cache.
+/// </para>
+/// <para>
+/// These tests verify that the distributed cache implementation correctly stores and retrieves
+/// events for resumability, including across simulated disconnections.
+/// </para>
+/// </remarks>
+public class DistributedCacheResumabilityIntegrationTests(ITestOutputHelper testOutputHelper) : ResumabilityIntegrationTestsBase(testOutputHelper)
+{
+    private MemoryDistributedCache? _cache;
+
+    /// <inheritdoc />
+    protected override ValueTask<ISseEventStreamStore> CreateEventStreamStoreAsync()
+    {
+        // Create a new in-memory distributed cache for each test
+        _cache = new MemoryDistributedCache(Options.Create(new MemoryDistributedCacheOptions()));
+
+        // Configure the store with shorter expiration times suitable for testing
+        var options = new DistributedCacheEventStreamStoreOptions
+        {
+            // Use shorter polling interval for faster test execution
+            StreamReaderPollingInterval = TimeSpan.FromMilliseconds(50),
+
+            // Use shorter expiration times for tests
+            EventSlidingExpiration = TimeSpan.FromMinutes(5),
+            EventAbsoluteExpiration = TimeSpan.FromMinutes(10),
+            MetadataSlidingExpiration = TimeSpan.FromMinutes(5),
+            MetadataAbsoluteExpiration = TimeSpan.FromMinutes(10),
+        };
+
+        var store = new DistributedCacheEventStreamStore(_cache, options, LoggerFactory.CreateLogger<DistributedCacheEventStreamStore>());
+        return new ValueTask<ISseEventStreamStore>(store);
+    }
+}