mirror of
https://github.com/OPCFoundation/UA-.NETStandard.git
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AlinMoldovean
69 lines
2.9 KiB
C#
69 lines
2.9 KiB
C#
/* ========================================================================
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* Copyright (c) 2005-2019 The OPC Foundation, Inc. All rights reserved.
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*
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* OPC Foundation MIT License 1.00
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* The complete license agreement can be found here:
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* http://opcfoundation.org/License/MIT/1.00/
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* ======================================================================*/
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using System;
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using System.Collections.Generic;
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using System.Xml;
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using System.IO;
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using System.Text;
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using System.Reflection;
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using System.Threading;
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using System.Globalization;
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using Opc.Ua;
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using Opc.Ua.Server;
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namespace TestData
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{
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/// <summary>
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/// An interface to an object which can access historical data for a variable.
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/// </summary>
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public interface IHistoryDataSource
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{
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/// <summary>
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/// Returns the next value in the archive.
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/// </summary>
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/// <param name="startTime">The starting time for the search.</param>
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/// <param name="isForward">Whether to search forward in time.</param>
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/// <param name="isReadModified">Whether to return modified data.</param>
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/// <param name="position">A index that must be passed to the NextRaw call. </param>
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/// <returns>The DataValue.</returns>
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DataValue FirstRaw(DateTime startTime, bool isForward, bool isReadModified, out int position);
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/// <summary>
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/// Returns the next value in the archive.
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/// </summary>
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/// <param name="lastTime">The timestamp of the last value returned.</param>
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/// <param name="isForward">Whether to search forward in time.</param>
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/// <param name="isReadModified">Whether to return modified data.</param>
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/// <param name="position">A index previously returned by the reader.</param>
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/// <returns>The DataValue.</returns>
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DataValue NextRaw(DateTime lastTime, bool isForward, bool isReadModified, ref int position);
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}
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}
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