chore: import upstream snapshot with attribution

Common/Interfaces/IJobQueueHandler.cs

@@ -0,0 +1,45 @@
+/*
+ * 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.ComponentModel.Composition;
+using QuantConnect.Packets;
+
+namespace QuantConnect.Interfaces
+{
+    /// <summary>
+    /// Task requestor interface with cloud system
+    /// </summary>
+    [InheritedExport(typeof(IJobQueueHandler))]
+    public interface IJobQueueHandler
+    {
+        /// <summary>
+        /// Initialize the internal state
+        /// </summary>
+        void Initialize(IApi api, IMessagingHandler messagingHandler);
+
+        /// <summary>
+        /// Request the next task to run through the engine:
+        /// </summary>
+        /// <returns>Algorithm job to process</returns>
+        AlgorithmNodePacket NextJob(out string algorithmPath);
+
+        /// <summary>
+        /// Signal task complete
+        /// </summary>
+        /// <param name="job">Work to do.</param>
+        void AcknowledgeJob(AlgorithmNodePacket job);
+    }
+}