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 +1,86 @@
+/*
+ * 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.Runtime.CompilerServices;
+
+namespace QuantConnect.Lean.Engine.DataFeeds.WorkScheduling
+{
+    /// <summary>
+    /// Class to represent a work item
+    /// </summary>
+    public class WorkItem
+    {
+        /// <summary>
+        /// Function to determine weight of item
+        /// </summary>
+        private Func<int> _weightFunc;
+
+        /// <summary>
+        /// The current weight
+        /// </summary>
+        public int Weight { get; private set; }
+
+        /// <summary>
+        /// The work function to execute
+        /// </summary>
+        public Func<int, bool> Work { get; }
+
+        /// <summary>
+        /// Creates a new instance
+        /// </summary>
+        /// <param name="work">The work function, takes an int, the amount of work to do
+        /// and returns a bool, false if this work item is finished</param>
+        /// <param name="weightFunc">The function used to determine the current weight</param>
+        public WorkItem(Func<int, bool> work, Func<int> weightFunc)
+        {
+            Work = work;
+            _weightFunc = weightFunc;
+        }
+
+        /// <summary>
+        /// Updates the weight of this work item
+        /// </summary>
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public int UpdateWeight()
+        {
+            Weight = _weightFunc();
+            return Weight;
+        }
+
+        /// <summary>
+        /// Compares two work items based on their weights
+        /// </summary>
+        public static int Compare(WorkItem obj, WorkItem other)
+        {
+            if (ReferenceEquals(obj, other))
+            {
+                return 0;
+            }
+            // By definition, any object compares greater than null
+            if (ReferenceEquals(obj, null))
+            {
+                return -1;
+            }
+            if (ReferenceEquals(null, other))
+            {
+                return 1;
+            }
+
+            return other.Weight.CompareTo(obj.Weight);
+        }
+    }
+}