108 lines
2.8 KiB
C#
108 lines
2.8 KiB
C#
/*
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* Copyright (c) 2018 ETH Zürich, Educational Development and Technology (LET)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using SafeExamBrowser.Contracts.Communication.Proxies;
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using SafeExamBrowser.Contracts.Configuration;
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using SafeExamBrowser.Contracts.Configuration.Settings;
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using SafeExamBrowser.Contracts.Core.OperationModel;
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using SafeExamBrowser.Contracts.Core.OperationModel.Events;
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using SafeExamBrowser.Contracts.I18n;
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using SafeExamBrowser.Contracts.Logging;
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namespace SafeExamBrowser.Runtime.Operations
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{
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internal class ServiceOperation : IRepeatableOperation
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{
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private bool connected, mandatory;
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private IConfigurationRepository configuration;
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private ILogger logger;
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private IServiceProxy service;
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public event ActionRequiredEventHandler ActionRequired { add { } remove { } }
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public event StatusChangedEventHandler StatusChanged;
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public ServiceOperation(IConfigurationRepository configuration, ILogger logger, IServiceProxy service)
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{
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this.configuration = configuration;
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this.service = service;
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this.logger = logger;
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}
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public OperationResult Perform()
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{
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logger.Info($"Initializing service session...");
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StatusChanged?.Invoke(TextKey.OperationStatus_InitializeServiceSession);
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mandatory = configuration.CurrentSettings.ServicePolicy == ServicePolicy.Mandatory;
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connected = service.Connect();
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if (mandatory && !connected)
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{
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logger.Error("Failed to initialize a service session since the service is mandatory but not available!");
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return OperationResult.Failed;
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}
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service.Ignore = !connected;
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logger.Info($"The service is {(mandatory ? "mandatory" : "optional")} and {(connected ? "available." : "not available. All service-related operations will be ignored!")}");
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if (connected)
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{
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StartServiceSession();
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}
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return OperationResult.Success;
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}
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public OperationResult Repeat()
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{
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var result = Revert();
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if (result != OperationResult.Success)
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{
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return result;
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}
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return Perform();
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}
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public OperationResult Revert()
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{
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logger.Info("Finalizing service session...");
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StatusChanged?.Invoke(TextKey.OperationStatus_FinalizeServiceSession);
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if (connected)
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{
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StopServiceSession();
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var success = service.Disconnect();
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if (success)
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{
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logger.Info("Successfully disconnected from the service.");
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}
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else
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{
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logger.Error("Failed to disconnect from the service!");
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}
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}
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return OperationResult.Success;
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}
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private void StartServiceSession()
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{
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service.StartSession(configuration.CurrentSession.Id, configuration.CurrentSettings);
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}
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private void StopServiceSession()
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{
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service.StopSession(configuration.CurrentSession.Id);
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}
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}
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}
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