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CommandFrame.cs
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CommandFrame.cs
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//******************************************************************************************************
// CommandFrame.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:
// ----------------------------------------------------------------------------------------------------
// 04/27/2009 - 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.Runtime.Serialization;
using Gemstone.IO.Checksums.ChecksumExtensions;
using Gemstone.IO.Parsing;
namespace Gemstone.PhasorProtocols.SelFastMessage
{
/// <summary>
/// Represents the SEL Fast Message implementation of a <see cref="ICommandFrame"/> that can be sent or received.
/// </summary>
/// <remarks>
/// SEL Fast Message command frames are designed only to be sent to a device, not received from a device. As a result
/// this frame does not implement <see cref="ISupportFrameImage{TTypeIdentifier}"/> for automated frame parsing. This class
/// exposes a constructor that accepts a binary image in order to manually parse a command frame.
/// </remarks>
[Serializable]
public class CommandFrame : CommandFrameBase
{
#region [ Members ]
// Fields
private MessagePeriod m_messagePeriod;
#endregion
#region [ Constructors ]
/// <summary>
/// Creates a new <see cref="CommandFrame"/> from the given <paramref name="buffer"/>.
/// </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>
/// <remarks>
/// This constructor is used by a consumer to parse a received SEL Fast Message command frame. Typically
/// command frames are sent to a device. This constructor would used if this code was being used
/// inside of a phasor measurement device.
/// </remarks>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="length"/> is not large enough to parse frame.</exception>
public CommandFrame(byte[] buffer, int startIndex, int length)
: base(new CommandCellCollection(0), PhasorProtocols.DeviceCommand.ReservedBits)
{
if (length < 16)
throw new ArgumentOutOfRangeException(nameof(length));
// Validate check-sum
if (!ChecksumIsValid(buffer, startIndex))
throw new InvalidOperationException($"Invalid binary image detected - check sum of {GetType().Name} did not match");
// Validate SEL Fast Message data image
if (buffer[startIndex] != Common.HeaderByte1 || buffer[startIndex + 1] != Common.HeaderByte2)
throw new InvalidOperationException($"Bad data stream, expected header bytes 0xA546 as first bytes in SEL Fast Message command frame, got 0x{buffer[startIndex].ToString("X").PadLeft(2, '0')}{buffer[startIndex + 1].ToString("X").PadLeft(2, '0')}");
Command = (DeviceCommand)buffer[startIndex + 9];
if (Command == DeviceCommand.EnableUnsolicitedMessages)
m_messagePeriod = (MessagePeriod)BigEndian.ToUInt16(buffer, startIndex + 14);
// Validate check-sum
int sumLength = FrameSize - 2;
if (BigEndian.ToUInt16(buffer, startIndex + sumLength) != CalculateChecksum(buffer, startIndex, sumLength))
throw new InvalidOperationException($"Invalid binary image detected - check sum of {GetType().Name} did not match");
}
/// <summary>
/// Creates a new <see cref="CommandFrame"/> from specified parameters.
/// </summary>
/// <param name="command">The <see cref="PhasorProtocols.DeviceCommand"/> for this <see cref="CommandFrame"/>.</param>
/// <param name="messagePeriod">The desired <see cref="SelFastMessage.MessagePeriod"/> for SEL device connection.</param>
/// <remarks>
/// This constructor is used by a consumer to generate an SEL Fast Message command frame.
/// </remarks>
public CommandFrame(PhasorProtocols.DeviceCommand command, MessagePeriod messagePeriod)
: base(new CommandCellCollection(0), command)
{
if (command != PhasorProtocols.DeviceCommand.EnableRealTimeData && command != PhasorProtocols.DeviceCommand.DisableRealTimeData)
throw new ArgumentException($"SEL Fast Message does not support {command} device command.", nameof(command));
m_messagePeriod = messagePeriod;
}
/// <summary>
/// Creates a new <see cref="CommandFrame"/> 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 CommandFrame(SerializationInfo info, StreamingContext context)
: base(info, context)
{
// Deserialize command frame
m_messagePeriod = (MessagePeriod)info.GetValue("messagePeriod", typeof(MessagePeriod));
}
#endregion
#region [ Properties ]
/// <summary>
/// Gets or sets the <see cref="DeviceCommand"/> for this <see cref="CommandFrame"/>.
/// </summary>
public new DeviceCommand Command
{
// Interpret SEL specific device command
get
{
return base.Command switch
{
PhasorProtocols.DeviceCommand.EnableRealTimeData => DeviceCommand.EnableUnsolicitedMessages,
PhasorProtocols.DeviceCommand.DisableRealTimeData => DeviceCommand.DisableUnsolicitedMessages,
_ => DeviceCommand.Undefined,
};
}
set
{
base.Command = value switch
{
DeviceCommand.EnableUnsolicitedMessages => PhasorProtocols.DeviceCommand.EnableRealTimeData,
DeviceCommand.DisableUnsolicitedMessages => PhasorProtocols.DeviceCommand.DisableRealTimeData,
_ => PhasorProtocols.DeviceCommand.ReservedBits,
};
}
}
/// <summary>
/// Gets or sets the desired message period for the SEL device.
/// </summary>
public MessagePeriod MessagePeriod
{
get => m_messagePeriod;
set => m_messagePeriod = value;
}
/// <summary>
/// Gets frame size based on <see cref="Command"/>.
/// </summary>
public byte FrameSize => (byte)(Command == DeviceCommand.EnableUnsolicitedMessages ? 18 : 16);
/// <summary>
/// Gets the length of the <see cref="HeaderImage"/>.
/// </summary>
protected override int HeaderLength => 9;
/// <summary>
/// Gets the binary header image of the <see cref="DataFrame"/> object.
/// </summary>
protected override byte[] HeaderImage
{
get
{
byte[] buffer = new byte[9];
buffer[0] = Common.HeaderByte1;
buffer[1] = Common.HeaderByte2;
buffer[2] = FrameSize;
return buffer;
}
}
/// <summary>
/// Gets the length of the <see cref="BodyImage"/>.
/// </summary>
protected override int BodyLength =>
FrameSize - HeaderLength - 2; // Total frame size - header length - CRC value length
/// <summary>
/// Gets the binary body image of this <see cref="CommandFrame"/>.
/// </summary>
protected override byte[] BodyImage
{
get
{
byte[] buffer = new byte[BodyLength];
buffer[0] = (byte)Command;
buffer[1] = 0xC0;
buffer[3] = 0x20;
// Only add desired message rate for enable command
if (Command == DeviceCommand.EnableUnsolicitedMessages)
BigEndian.CopyBytes((ushort)m_messagePeriod, buffer, 5);
return buffer;
}
}
/// <summary>
/// <see cref="Dictionary{TKey,TValue}"/> of string based property names and values for the <see cref="DataFrame"/> object.
/// </summary>
public override Dictionary<string, string> Attributes
{
get
{
Dictionary<string, string> baseAttributes = base.Attributes;
baseAttributes.Add("Defined Message Period", $"{(ushort)MessagePeriod}: {MessagePeriod}");
return baseAttributes;
}
}
#endregion
#region [ Methods ]
/// <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)
{
// SEL Fast Message uses CRC Modbus to calculate checksum for frames
return buffer.ModBusCrcChecksum(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 command frame
info.AddValue("messagePeriod", m_messagePeriod, typeof(MessagePeriod));
}
#endregion
}
}