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EventStorage.cs

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+/***************************************************************************
+ * Copyright Andy Brummer 2004-2005
+ * 
+ * This code is provided "as is", with absolutely no warranty expressed
+ * or implied. Any use is at your own risk.
+ *
+ * This code may be used in compiled form in any way you desire. This
+ * file may be redistributed unmodified by any means provided it is
+ * not sold for profit without the authors written consent, and
+ * providing that this notice and the authors name is included. If
+ * the source code in  this file is used in any commercial application
+ * then a simple email would be nice.
+ * 
+ **************************************************************************/
+
+using System;
+using System.Xml;
+using System.Xml.XPath;
+
+namespace UtilidadesCSharp.Schedule
+{
+	/// <summary>
+	/// Null event strorage disables error recovery by returning now for the last time an event fired.
+	/// </summary>
+	public class NullEventStorage : IEventStorage
+	{
+		public NullEventStorage()
+		{
+		}
+
+		public void RecordLastTime(DateTime Time)
+		{
+		}
+
+		public DateTime ReadLastTime()
+		{
+			return DateTime.Now;
+		}
+	}
+
+	/// <summary>
+	/// Local event strorage keeps the last time in memory so that skipped events are not recovered.
+	/// </summary>
+	public class LocalEventStorage : IEventStorage
+	{
+		public LocalEventStorage()
+		{
+			_LastTime = DateTime.MaxValue;
+		}
+
+		public void RecordLastTime(DateTime Time)
+		{
+			_LastTime = Time;
+		}
+
+		public DateTime ReadLastTime()
+		{
+			if (_LastTime == DateTime.MaxValue)
+				_LastTime = DateTime.Now;
+			return _LastTime;
+		}
+
+		DateTime _LastTime;
+	}
+
+	/// <summary>
+	/// FileEventStorage saves the last time in an XmlDocument so that recovery will include periods that the 
+	/// process is shutdown.
+	/// </summary>
+	public class FileEventStorage : IEventStorage
+	{
+		public FileEventStorage(string FileName, string XPath)
+		{
+			_FileName = FileName;
+			_XPath = XPath;
+		}
+
+		public void RecordLastTime(DateTime Time)
+		{
+			_Doc.SelectSingleNode(_XPath).Value = Time.ToString();
+			_Doc.Save(_FileName);
+		}
+
+		public DateTime ReadLastTime()
+		{
+			_Doc.Load(_FileName);
+			string Value = _Doc.SelectSingleNode(_XPath).Value;
+			if (Value == null || Value == string.Empty)
+				return DateTime.Now;
+			return DateTime.Parse(Value);
+		}
+
+		string _FileName;
+		string _XPath;
+		XmlDocument _Doc = new XmlDocument();
+	}
+}