chore: import upstream snapshot with attribution

2026-07-13 13:02:50 +08:00
commit 0fc60fdcb1
5008 changed files with 910633 additions and 0 deletions
@@ -0,0 +1,98 @@
+/*
+ * 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 QuantConnect.Data.UniverseSelection;
+using QuantConnect.Interfaces;
+using QuantConnect.Lean.Engine.Results;
+using QuantConnect.Packets;
+
+namespace QuantConnect.Lean.Engine.DataFeeds
+{
+    /// <summary>
+    /// Null data feed implementation. <seealso cref="DataManager"/>
+    /// </summary>
+    public class NullDataFeed : IDataFeed
+    {
+        /// <summary>
+        /// Allows specifying if this implementation should throw always or not
+        /// </summary>
+        public bool ShouldThrow { get; set; } = true;
+
+        /// <inheritdoc />
+        public bool IsActive
+        {
+            get
+            {
+                if (!ShouldThrow)
+                {
+                    return true;
+                }
+                throw new NotImplementedException("Unexpected usage of null data feed implementation.");
+            }
+        }
+
+        /// <inheritdoc />
+        public void Initialize(
+            IAlgorithm algorithm,
+            AlgorithmNodePacket job,
+            IResultHandler resultHandler,
+            IMapFileProvider mapFileProvider,
+            IFactorFileProvider factorFileProvider,
+            IDataProvider dataProvider,
+            IDataFeedSubscriptionManager subscriptionManager,
+            IDataFeedTimeProvider dataFeedTimeProvider,
+            IDataChannelProvider dataChannelProvider
+            )
+        {
+            if (!ShouldThrow)
+            {
+                return;
+            }
+            throw new NotImplementedException("Unexpected usage of null data feed implementation.");
+        }
+
+        /// <inheritdoc />
+        public Subscription CreateSubscription(SubscriptionRequest request)
+        {
+            if (!ShouldThrow)
+            {
+                return null;
+            }
+            throw new NotImplementedException("Unexpected usage of null data feed implementation.");
+        }
+
+        /// <inheritdoc />
+        public void RemoveSubscription(Subscription subscription)
+        {
+            if (!ShouldThrow)
+            {
+                return;
+            }
+            throw new NotImplementedException("Unexpected usage of null data feed implementation.");
+        }
+
+        /// <inheritdoc />
+        public void Exit()
+        {
+            if (!ShouldThrow)
+            {
+                return;
+            }
+            throw new NotImplementedException("Unexpected usage of null data feed implementation.");
+        }
+    }
+}