Restore SEBPatch

SafeExamBrowser.Core/OperationModel/RepeatableOperationSequence.cs

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+/*
+ * Copyright (c) 2024 ETH Zürich, IT Services
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+using System;
+using System.Collections.Generic;
+using SafeExamBrowser.Core.Contracts.OperationModel;
+using SafeExamBrowser.Core.Contracts.OperationModel.Events;
+using SafeExamBrowser.Logging.Contracts;
+
+namespace SafeExamBrowser.Core.OperationModel
+{
+	/// <summary>
+	/// Default implementation of the <see cref="IRepeatableOperationSequence"/>.
+	/// </summary>
+	public class RepeatableOperationSequence : OperationSequence, IRepeatableOperationSequence
+	{
+		private new Queue<IRepeatableOperation> operations;
+
+		public RepeatableOperationSequence(ILogger logger, Queue<IRepeatableOperation> operations) : base(logger, new Queue<IOperation>(operations))
+		{
+			this.operations = new Queue<IRepeatableOperation>(operations);
+		}
+
+		public OperationResult TryRepeat()
+		{
+			var result = OperationResult.Failed;
+
+			try
+			{
+				Initialize();
+				result = Repeat();
+			}
+			catch (Exception e)
+			{
+				logger.Error("Failed to repeat operations!", e);
+			}
+
+			return result;
+		}
+
+		private OperationResult Repeat()
+		{
+			foreach (var operation in operations)
+			{
+				var result = OperationResult.Failed;
+
+				try
+				{
+					result = operation.Repeat();
+				}
+				catch (Exception e)
+				{
+					logger.Error($"Caught unexpected exception while repeating operation '{operation.GetType().Name}'!", e);
+				}
+
+				if (result != OperationResult.Success)
+				{
+					return result;
+				}
+
+				UpdateProgress(new ProgressChangedEventArgs { Progress = true });
+			}
+
+			return OperationResult.Success;
+		}
+	}
+}