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ConfigurationFrame.cs
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ConfigurationFrame.cs
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//******************************************************************************************************
// ConfigurationFrame.cs - Gbtc
//
// Copyright © 2012, Grid Protection Alliance. All Rights Reserved.
//
// Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See
// the NOTICE file distributed with this work for additional information regarding copyright ownership.
// The GPA licenses this file to you under the MIT License (MIT), the "License"; you may
// not use this file except in compliance with the License. You may obtain a copy of the License at:
//
// http://www.opensource.org/licenses/MIT
//
// Unless agreed to in writing, the subject software distributed under the License is distributed on an
// "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the
// License for the specific language governing permissions and limitations.
//
// Code Modification History:
// ----------------------------------------------------------------------------------------------------
// 01/14/2005 - J. Ritchie Carroll
// Generated original version of source code.
// 09/15/2009 - Stephen C. Wills
// Added new header and license agreement.
// 12/17/2012 - Starlynn Danyelle Gilliam
// Modified Header.
//
//******************************************************************************************************
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.Serialization;
using Gemstone.IO.Checksums.ChecksumExtensions;
using Gemstone.IO.Parsing;
using Gemstone.Numeric.EE;
namespace Gemstone.PhasorProtocols.IEEE1344
{
/// <summary>
/// Represents the IEEE 1344 implementation of a <see cref="IConfigurationFrame"/> that can be sent or received.
/// </summary>
[Serializable]
public class ConfigurationFrame : ConfigurationFrameBase, ISupportSourceIdentifiableFrameImage<SourceChannel, FrameType>
{
#region [ Members ]
// Constants
private const int FixedFooterLength = 2;
// Fields
private CommonFrameHeader m_frameHeader;
private ulong m_idCode;
#endregion
#region [ Constructors ]
/// <summary>
/// Creates a new <see cref="ConfigurationFrame"/>.
/// </summary>
/// <remarks>
/// This constructor is used by <see cref="FrameImageParserBase{TTypeIdentifier,TOutputType}"/> to parse an IEEE 1344 configuration frame.
/// </remarks>
[EditorBrowsable(EditorBrowsableState.Never)]
public ConfigurationFrame()
: base(0, new ConfigurationCellCollection(), 0, 0)
{
}
/// <summary>
/// Creates a new <see cref="ConfigurationFrame"/> from specified parameters.
/// </summary>
/// <param name="idCode">The ID code of this <see cref="ConfigurationFrame"/>.</param>
/// <param name="timestamp">The exact timestamp, in <see cref="Ticks"/>, of the data represented by this <see cref="ConfigurationFrame"/>.</param>
/// <param name="frameRate">The defined frame rate of this <see cref="ConfigurationFrame"/>.</param>
/// <remarks>
/// This constructor is used by a consumer to generate an IEEE 1344 configuration frame.
/// </remarks>
public ConfigurationFrame(ulong idCode, Ticks timestamp, ushort frameRate)
: base(0, new ConfigurationCellCollection(), timestamp, frameRate)
{
IDCode = idCode;
}
/// <summary>
/// Creates a new <see cref="ConfigurationFrame"/> from serialization parameters.
/// </summary>
/// <param name="info">The <see cref="SerializationInfo"/> with populated with data.</param>
/// <param name="context">The source <see cref="StreamingContext"/> for this deserialization.</param>
protected ConfigurationFrame(SerializationInfo info, StreamingContext context)
: base(info, context)
{
// Deserialize configuration frame
m_frameHeader = (CommonFrameHeader)info.GetValue("frameHeader", typeof(CommonFrameHeader));
IDCode = info.GetUInt64("idCode64Bit");
// Copy in associated properties from base class deserialization that are proxied for use by CommonFrameHeader
m_frameHeader.Timestamp = base.Timestamp;
}
#endregion
#region [ Properties ]
/// <summary>
/// Gets reference to the <see cref="ConfigurationCellCollection"/> for this <see cref="ConfigurationFrame"/>.
/// </summary>
public new ConfigurationCellCollection Cells => base.Cells as ConfigurationCellCollection;
/// <summary>
/// Gets or sets the ID code of this <see cref="ConfigurationFrame"/>.
/// </summary>
public new ulong IDCode
{
get => m_idCode;
set
{
m_idCode = value;
// Base classes constrain maximum value to 65535
base.IDCode = value > ushort.MaxValue ? ushort.MaxValue : (ushort)value;
}
}
/// <summary>
/// Gets or sets exact timestamp, in ticks, of the data represented by this <see cref="ConfigurationFrame"/>.
/// </summary>
/// <remarks>
/// The value of this property represents the number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight, January 1, 0001.
/// </remarks>
public override Ticks Timestamp
{
get => CommonHeader.Timestamp;
set
{
// Keep timestamp updates synchronized...
CommonHeader.Timestamp = value;
base.Timestamp = value;
}
}
/// <summary>
/// Gets the timestamp of this frame in NTP format.
/// </summary>
public new NtpTimeTag TimeTag => CommonHeader.TimeTag;
/// <summary>
/// Gets or sets the nominal <see cref="LineFrequency"/> of this <see cref="ConfigurationFrame"/>.
/// </summary>
public LineFrequency NominalFrequency
{
// Since IEEE 1344 only supports a single device there will only be one cell, so we just share nominal frequency with our only child
// and expose the value at the parent level for convenience
get => Cells[0].NominalFrequency;
set => Cells[0].NominalFrequency = value;
}
/// <summary>
/// Gets or sets the IEEE 1344 period value.
/// </summary>
public ushort Period
{
get => (ushort)((double)NominalFrequency / FrameRate * 100.0D);
set => FrameRate = (ushort)((double)NominalFrequency * 100.0D / value);
}
/// <summary>
/// Gets the identifier that is used to identify the IEEE 1344 frame.
/// </summary>
public FrameType TypeID => IEEE1344.FrameType.ConfigurationFrame;
/// <summary>
/// Gets or sets current <see cref="CommonFrameHeader"/>.
/// </summary>
public CommonFrameHeader CommonHeader
{
// Make sure frame header exists - using base class timestamp to
// prevent recursion (m_frameHeader doesn't exist yet)
get => m_frameHeader ??= new CommonFrameHeader(TypeID, base.Timestamp);
set
{
m_frameHeader = value;
if (m_frameHeader is null)
return;
State = m_frameHeader.State as IConfigurationFrameParsingState;
base.Timestamp = m_frameHeader.Timestamp;
}
}
// This interface implementation satisfies ISupportFrameImage<FrameType>.CommonHeader
ICommonHeader<FrameType> ISupportFrameImage<FrameType>.CommonHeader
{
get => CommonHeader;
set => CommonHeader = value as CommonFrameHeader;
}
/// <summary>
/// Gets the length of the <see cref="HeaderImage"/>.
/// </summary>
protected override int HeaderLength => CommonFrameHeader.FixedLength;
/// <summary>
/// Gets the binary header image of the <see cref="ConfigurationFrame"/> object.
/// </summary>
protected override byte[] HeaderImage
{
get
{
// Make sure to provide proper frame length for use in the common header image
CommonHeader.FrameLength = (ushort)BinaryLength;
return CommonHeader.BinaryImage;
}
}
/// <summary>
/// Gets the length of the <see cref="FooterImage"/>.
/// </summary>
protected override int FooterLength => FixedFooterLength;
/// <summary>
/// Gets the binary footer image of the <see cref="ConfigurationFrame"/> object.
/// </summary>
protected override byte[] FooterImage => BigEndian.GetBytes(Period);
/// <summary>
/// <see cref="Dictionary{TKey,TValue}"/> of string based property names and values for the <see cref="ConfigurationFrame"/> object.
/// </summary>
public override Dictionary<string, string> Attributes
{
get
{
Dictionary<string, string> baseAttributes = base.Attributes;
CommonHeader.AppendHeaderAttributes(baseAttributes);
baseAttributes.Add("64-Bit ID Code", IDCode.ToString());
baseAttributes.Add("Period", Period.ToString());
return baseAttributes;
}
}
#endregion
#region [ Methods ]
/// <summary>
/// Parses the binary image.
/// </summary>
/// <param name="buffer">Binary image to parse.</param>
/// <param name="startIndex">Start index into <paramref name="buffer"/> to begin parsing.</param>
/// <param name="length">Length of valid data within <paramref name="buffer"/>.</param>
/// <returns>The length of the data that was parsed.</returns>
/// <remarks>
/// This method is overridden to parse from cumulated frame images.
/// </remarks>
public override int ParseBinaryImage(byte[] buffer, int startIndex, int length)
{
// If frame image collector was used, make sure and parse from entire frame image...
if (m_frameHeader is null)
return base.ParseBinaryImage(buffer, startIndex, length);
// If all configuration frame images have been received, we can safely start parsing
if (m_frameHeader.IsLastFrame)
{
FrameImageCollector frameImages = m_frameHeader.FrameImages;
if (frameImages is null)
return State.ParsedBinaryLength;
// Each individual frame will already have had a CRC check, so we implement standard parse to
// bypass ChannelBase CRC frame validation on cumulative frame image
buffer = frameImages.BinaryImage;
length = frameImages.BinaryLength;
startIndex = 0;
// Parse out header, body and footer images
startIndex += ParseHeaderImage(buffer, startIndex, length);
startIndex += ParseBodyImage(buffer, startIndex, length - startIndex);
startIndex += ParseFooterImage(buffer, startIndex, length - startIndex);
// Include 2 bytes for CRC that was already validated
return startIndex + 2;
}
// There are more configuration frame images coming, keep parser moving by returning total
// frame length that was already parsed.
return State.ParsedBinaryLength;
}
/// <summary>
/// Parses the binary header image.
/// </summary>
/// <param name="buffer">Binary image to parse.</param>
/// <param name="startIndex">Start index into <paramref name="buffer"/> to begin parsing.</param>
/// <param name="length">Length of valid data within <paramref name="buffer"/>.</param>
/// <returns>The length of the data that was parsed.</returns>
protected override int ParseHeaderImage(byte[] buffer, int startIndex, int length)
{
// We already parsed the frame header, so we just skip past it...
return CommonFrameHeader.FixedLength;
}
/// <summary>
/// Parses the binary footer image.
/// </summary>
/// <param name="buffer">Binary image to parse.</param>
/// <param name="startIndex">Start index into <paramref name="buffer"/> to begin parsing.</param>
/// <param name="length">Length of valid data within <paramref name="buffer"/>.</param>
/// <returns>The length of the data that was parsed.</returns>
protected override int ParseFooterImage(byte[] buffer, int startIndex, int length)
{
// Period assignment calculates FrameRate using NominalFrequency which is shared
// with first (and only) configuration cell, since cell was added during ParseBodyImage
// of ChannelFrameBase, performing the following succeeds since parsing the footer
// follows parsing the body :)
Period = BigEndian.ToUInt16(buffer, startIndex);
return FixedFooterLength;
}
/// <summary>
/// Calculates checksum of given <paramref name="buffer"/>.
/// </summary>
/// <param name="buffer">Buffer image over which to calculate checksum.</param>
/// <param name="offset">Start index into <paramref name="buffer"/> to calculate checksum.</param>
/// <param name="length">Length of data within <paramref name="buffer"/> to calculate checksum.</param>
/// <returns>Checksum over specified portion of <paramref name="buffer"/>.</returns>
protected override ushort CalculateChecksum(byte[] buffer, int offset, int length)
{
// IEEE 1344 uses CRC-CCITT to calculate checksum for frames
return buffer.CrcCCITTChecksum(offset, length);
}
/// <summary>
/// Populates a <see cref="SerializationInfo"/> with the data needed to serialize the target object.
/// </summary>
/// <param name="info">The <see cref="SerializationInfo"/> to populate with data.</param>
/// <param name="context">The destination <see cref="StreamingContext"/> for this serialization.</param>
public override void GetObjectData(SerializationInfo info, StreamingContext context)
{
base.GetObjectData(info, context);
// Serialize configuration frame
info.AddValue("frameHeader", m_frameHeader, typeof(CommonFrameHeader));
info.AddValue("idCode64Bit", m_idCode);
}
#endregion
}
}