86 lines
1.7 KiB
C#
86 lines
1.7 KiB
C#
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/*
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* Copyright (c) 2017 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 System;
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using System.Collections.Generic;
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using System.Linq;
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using SafeExamBrowser.Contracts.Logging;
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using SafeExamBrowser.Core.Entities;
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namespace SafeExamBrowser.Core.Logging
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{
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public class Logger : ILogger
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{
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private static readonly object @lock = new object();
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private readonly IList<ILogMessage> log = new List<ILogMessage>();
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private readonly IList<ILogObserver> observers = new List<ILogObserver>();
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public void Error(string message)
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{
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Log(LogLevel.Error, message);
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}
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public void Info(string message)
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{
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Log(LogLevel.Info, message);
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}
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public void Warn(string message)
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{
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Log(LogLevel.Warn, message);
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}
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public IList<ILogMessage> GetLog()
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{
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lock (@lock)
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{
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return log.Select(m => m.Clone() as ILogMessage).ToList();
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}
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}
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public void Subscribe(ILogObserver observer)
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{
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if (observer == null)
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{
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throw new ArgumentNullException(nameof(observer));
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}
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lock (@lock)
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{
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if (!observers.Contains(observer))
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{
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observers.Add(observer);
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}
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}
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}
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public void Unsubscribe(ILogObserver observer)
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{
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lock (@lock)
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{
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observers.Remove(observer);
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}
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}
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private void Log(LogLevel severity, string message)
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{
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lock (@lock)
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{
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var entry = new LogMessage(DateTime.Now, severity, message);
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log.Add(entry);
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foreach (var observer in observers)
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{
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observer.Notify(entry);
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}
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}
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}
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}
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}
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