create new class to inherit from the DistributedCacheEntryOptions to …

…provide flexiblity w/token cache lifetime (#266)

src/Microsoft.Identity.Web/TokenCacheProviders/Distributed/MsalDistributedTokenCacheAdapter.cs

@@ -23,7 +23,7 @@ public class MsalDistributedTokenCacheAdapter : MsalAbstractTokenCacheProvider
         /// <summary>
         /// MSAL memory token cache options.
         /// </summary>
-        private readonly DistributedCacheEntryOptions _cacheOptions;
+        private readonly MsalDistributedTokenCacheAdapterOptions _cacheOptions;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="MsalDistributedTokenCacheAdapter"/> class.
@@ -36,7 +36,7 @@ public MsalDistributedTokenCacheAdapter(
                                             IOptions<MicrosoftIdentityOptions> microsoftIdentityOptions,
                                             IHttpContextAccessor httpContextAccessor,
                                             IDistributedCache memoryCache,
-                                            IOptions<DistributedCacheEntryOptions> cacheOptions)
+                                            IOptions<MsalDistributedTokenCacheAdapterOptions> cacheOptions)
             : base(microsoftIdentityOptions, httpContextAccessor)
         {
             if (cacheOptions == null)

src/Microsoft.Identity.Web/TokenCacheProviders/Distributed/MsalDistributedTokenCacheAdapterOptions.cs

@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using Microsoft.Extensions.Caching.Distributed;
+
+namespace Microsoft.Identity.Web.TokenCacheProviders.Distributed
+{
+    /// <summary>
+    /// Options for the MSAL token cache serialization adapter,
+    /// which delegates the serialization to the IDistributedCache implementations
+    /// available with .NET Core.
+    /// </summary>
+    public class MsalDistributedTokenCacheAdapterOptions : DistributedCacheEntryOptions
+    {
+    }
+}