Restore SEBPatch

SafeExamBrowser.Core/Operations/CommunicationHostOperation.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 SafeExamBrowser.Communication.Contracts;
+using SafeExamBrowser.Core.Contracts.OperationModel;
+using SafeExamBrowser.Core.Contracts.OperationModel.Events;
+using SafeExamBrowser.I18n.Contracts;
+using SafeExamBrowser.Logging.Contracts;
+
+namespace SafeExamBrowser.Core.Operations
+{
+	/// <summary>
+	/// An operation to handle the lifetime of an <see cref="ICommunicationHost"/>. The host is started during <see cref="Perform"/>,
+	/// stopped and restarted during <see cref="Repeat"/> (if not running) and stopped during <see cref="Revert"/>.
+	/// </summary>
+	public class CommunicationHostOperation : IRepeatableOperation
+	{
+		private ICommunicationHost host;
+		private ILogger logger;
+
+		public event ActionRequiredEventHandler ActionRequired { add { } remove { } }
+		public event StatusChangedEventHandler StatusChanged;
+
+		public CommunicationHostOperation(ICommunicationHost host, ILogger logger)
+		{
+			this.host = host;
+			this.logger = logger;
+		}
+
+		public OperationResult Perform()
+		{
+			logger.Info("Starting communication host...");
+			StatusChanged?.Invoke(TextKey.OperationStatus_StartCommunicationHost);
+
+			host.Start();
+
+			return OperationResult.Success;
+		}
+
+		public OperationResult Repeat()
+		{
+			if (!host.IsRunning)
+			{
+				logger.Info("Restarting communication host...");
+				StatusChanged?.Invoke(TextKey.OperationStatus_RestartCommunicationHost);
+
+				host.Stop();
+				host.Start();
+			}
+
+			return OperationResult.Success;
+		}
+
+		public OperationResult Revert()
+		{
+			logger.Info("Stopping communication host...");
+			StatusChanged?.Invoke(TextKey.OperationStatus_StopCommunicationHost);
+
+			host.Stop();
+
+			return OperationResult.Success;
+		}
+	}
+}