chore: import upstream snapshot with attribution

Common/Interfaces/IDataCacheProvider.cs

@@ -0,0 +1,52 @@
+/*
+ * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+ * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); 
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+*/
+
+using System;
+using System.IO;
+using System.Collections.Generic;
+
+namespace QuantConnect.Interfaces
+{
+    /// <summary>
+    /// Defines a cache for data
+    /// </summary>
+    public interface IDataCacheProvider : IDisposable
+    {
+        /// <summary>
+        /// Property indicating the data is temporary in nature and should not be cached
+        /// </summary>
+        bool IsDataEphemeral { get; }
+
+        /// <summary>
+        /// Fetch data from the cache
+        /// </summary>
+        /// <param name="key">A string representing the key of the cached data</param>
+        /// <returns>An <see cref="Stream"/> of the cached data</returns>
+        Stream Fetch(string key);
+
+        /// <summary>
+        /// Store the data in the cache
+        /// </summary>
+        /// <param name="key">The source of the data, used as a key to retrieve data in the cache</param>
+        /// <param name="data">The data to cache as a byte array</param>
+        void Store(string key, byte[] data);
+
+        /// <summary>
+        /// Returns a list of zip entries in a provided zip file
+        /// </summary>
+        List<string> GetZipEntries(string zipFile);
+    }
+}