//******************************************************************************************************// TimeSortedDataPointScanner.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:// ----------------------------------------------------------------------------------------------------// 11/08/2011 - J. Ritchie Carroll// Generated original version of source code.// 11/30/2011 - J. Ritchie Carroll// Modified to support buffer optimized ISupportBinaryImage.// 12/14/2012 - Starlynn Danyelle Gilliam// Modified Header.////****************************************************************************************************** using System;using System.Collections.Generic;using System.Linq; namespace GSF.Historian.Files{ /// <summary> /// Reads a series of data points from an <see cref="ArchiveFile"/> in sorted order. /// </summary> public class TimeSortedArchiveFileScanner : IArchiveFileScanner { #region [ Members ] // Fields private ArchiveFileAllocationTable m_fileAllocationTable; private IEnumerable<int> m_historianIDs; private TimeTag m_startTime; private TimeTag m_endTime; private IDataPoint m_resumeFrom; private EventHandler<EventArgs<Exception>> m_dataReadExceptionHandler; #endregion #region [ Properties ] /// <summary> /// Gets or sets the file allocation table of /// the file that this scanner is reading from. /// </summary> public ArchiveFileAllocationTable FileAllocationTable { get { return m_fileAllocationTable; } set { m_fileAllocationTable = value; } } /// <summary> /// Gets or sets the collection of /// point IDs to be scanned from the file. /// </summary> public IEnumerable<int> HistorianIDs { get { return m_historianIDs; } set { m_historianIDs = value; } } /// <summary> /// Gets or sets the minimum value of the timestamps /// of the data points returned by the scanner. /// </summary> public TimeTag StartTime { get { return m_startTime; } set { m_startTime = value; } } /// <summary> /// Gets or sets the maximum value of the timestamps /// of the data points returned by the scanner. /// </summary> public TimeTag EndTime { get { return m_endTime; } set { m_endTime = value; } } /// <summary> /// Gets or sets the data point from which to resume /// the scan if it was interrupted by a rollover. /// </summary> public IDataPoint ResumeFrom { get { return m_resumeFrom; } set { m_resumeFrom = value; } } /// <summary> /// Gets or sets the handler used to handle /// errors that occur while scanning the file. /// </summary> public EventHandler<EventArgs<Exception>> DataReadExceptionHandler { get { return m_dataReadExceptionHandler; } set { m_dataReadExceptionHandler = value; } } #endregion #region [ Methods ] /// <summary> /// Reads all <see cref="IDataPoint"/>s in time sorted order for the specified historian IDs. /// </summary> /// <returns>Each <see cref="IDataPoint"/> for the specified historian IDs.</returns> public IEnumerable<IDataPoint> Read() { List<IEnumerator<IDataPoint>> enumerators = new List<IEnumerator<IDataPoint>>(); // Setup enumerators for scanners that have data foreach (DataPointScanner scanner in GetScanners()) { IEnumerator<IDataPoint> enumerator = scanner.Read().GetEnumerator(); // Add enumerator to the list if it has at least one value if (enumerator.MoveNext()) enumerators.Add(enumerator); } // Start publishing data points in time-sorted order if (enumerators.Count > 0) { List<int> completed = new List<int>(); IDataPoint dataPoint; do { TimeTag publishTime = TimeTag.MaxValue; // Find minimum publication time for current values foreach (IEnumerator<IDataPoint> enumerator in enumerators) { dataPoint = enumerator.Current; if (dataPoint.Time.CompareTo(publishTime) < 0) publishTime = dataPoint.Time; } int index = 0; // Publish all values at the current time foreach (IEnumerator<IDataPoint> enumerator in enumerators) { bool enumerationComplete = false; dataPoint = enumerator.Current; if (dataPoint.Time.CompareTo(publishTime) <= 0) { // Attempt to advance to next data point, tracking completed enumerators if (!enumerator.MoveNext()) { enumerationComplete = true; completed.Add(index); } yield return dataPoint; // Make sure any point IDs with duplicated times directly follow if (!enumerationComplete) { while (enumerator.Current.Time.CompareTo(publishTime) <= 0) { yield return enumerator.Current; if (!enumerator.MoveNext()) { completed.Add(index); break; } } } } index++; } // Remove completed enumerators if (completed.Count > 0) { completed.Sort(); for (int i = completed.Count - 1; i >= 0; i--) { enumerators.RemoveAt(completed[i]); } completed.Clear(); } } while (enumerators.Count > 0); } } // Gets the list of data point scanners used to // scan the file for data belonging to this query. private List<DataPointScanner> GetScanners() { List<DataPointScanner> dataPointScanners = new List<DataPointScanner>(); if (m_historianIDs != null && m_historianIDs.Any()) { TimeTag startTime = m_startTime ?? TimeTag.MinValue; TimeTag endTime = m_endTime ?? TimeTag.MaxValue; int resumeFromHistorianID = 0; bool includeStartTime = true; // Set up parameters needed to properly resume a query after rollover if ((object)m_resumeFrom != null) { resumeFromHistorianID = m_resumeFrom.HistorianID; startTime = m_resumeFrom.Time ?? startTime; includeStartTime = false; } // Create data point scanners for each historian ID List<int> historianIDs = m_historianIDs.ToList(); historianIDs.Sort(); foreach (int historianID in historianIDs) { dataPointScanners.Add(new DataPointScanner(m_fileAllocationTable, historianID, startTime, endTime, includeStartTime, m_dataReadExceptionHandler)); if (historianID == resumeFromHistorianID) includeStartTime = true; } } return dataPointScanners; } #endregion }}
//******************************************************************************************************
// TimeSortedDataPointScanner.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:
// ----------------------------------------------------------------------------------------------------
// 11/08/2011 - J. Ritchie Carroll
// Generated original version of source code.
// 11/30/2011 - J. Ritchie Carroll
// Modified to support buffer optimized ISupportBinaryImage.
// 12/14/2012 - Starlynn Danyelle Gilliam
// Modified Header.
//
//******************************************************************************************************
using System;
using System.Collections.Generic;
using System.Linq;
namespace GSF.Historian.Files
{
/// <summary>
/// Reads a series of data points from an <see cref="ArchiveFile"/> in sorted order.
/// </summary>
public class TimeSortedArchiveFileScanner : IArchiveFileScanner
{
#region [ Members ]
// Fields
private ArchiveFileAllocationTable m_fileAllocationTable;
private IEnumerable<int> m_historianIDs;
private TimeTag m_startTime;
private TimeTag m_endTime;
private IDataPoint m_resumeFrom;
private EventHandler<EventArgs<Exception>> m_dataReadExceptionHandler;
#endregion
#region [ Properties ]
/// <summary>
/// Gets or sets the file allocation table of
/// the file that this scanner is reading from.
/// </summary>
public ArchiveFileAllocationTable FileAllocationTable
{
get
{
return m_fileAllocationTable;
}
set
{
m_fileAllocationTable = value;
}
}
/// <summary>
/// Gets or sets the collection of
/// point IDs to be scanned from the file.
/// </summary>
public IEnumerable<int> HistorianIDs
{
get
{
return m_historianIDs;
}
set
{
m_historianIDs = value;
}
}
/// <summary>
/// Gets or sets the minimum value of the timestamps
/// of the data points returned by the scanner.
/// </summary>
public TimeTag StartTime
{
get
{
return m_startTime;
}
set
{
m_startTime = value;
}
}
/// <summary>
/// Gets or sets the maximum value of the timestamps
/// of the data points returned by the scanner.
/// </summary>
public TimeTag EndTime
{
get
{
return m_endTime;
}
set
{
m_endTime = value;
}
}
/// <summary>
/// Gets or sets the data point from which to resume
/// the scan if it was interrupted by a rollover.
/// </summary>
public IDataPoint ResumeFrom
{
get
{
return m_resumeFrom;
}
set
{
m_resumeFrom = value;
}
}
/// <summary>
/// Gets or sets the handler used to handle
/// errors that occur while scanning the file.
/// </summary>
public EventHandler<EventArgs<Exception>> DataReadExceptionHandler
{
get
{
return m_dataReadExceptionHandler;
}
set
{
m_dataReadExceptionHandler = value;
}
}
#endregion
#region [ Methods ]
/// <summary>
/// Reads all <see cref="IDataPoint"/>s in time sorted order for the specified historian IDs.
/// </summary>
/// <returns>Each <see cref="IDataPoint"/> for the specified historian IDs.</returns>
public IEnumerable<IDataPoint> Read()
{
List<IEnumerator<IDataPoint>> enumerators = new List<IEnumerator<IDataPoint>>();
// Setup enumerators for scanners that have data
foreach (DataPointScanner scanner in GetScanners())
{
IEnumerator<IDataPoint> enumerator = scanner.Read().GetEnumerator();
// Add enumerator to the list if it has at least one value
if (enumerator.MoveNext())
enumerators.Add(enumerator);
}
// Start publishing data points in time-sorted order
if (enumerators.Count > 0)
{
List<int> completed = new List<int>();
IDataPoint dataPoint;
do
{
TimeTag publishTime = TimeTag.MaxValue;
// Find minimum publication time for current values
foreach (IEnumerator<IDataPoint> enumerator in enumerators)
{
dataPoint = enumerator.Current;
if (dataPoint.Time.CompareTo(publishTime) < 0)
publishTime = dataPoint.Time;
}
int index = 0;
// Publish all values at the current time
foreach (IEnumerator<IDataPoint> enumerator in enumerators)
{
bool enumerationComplete = false;
dataPoint = enumerator.Current;
if (dataPoint.Time.CompareTo(publishTime) <= 0)
{
// Attempt to advance to next data point, tracking completed enumerators
if (!enumerator.MoveNext())
{
enumerationComplete = true;
completed.Add(index);
}
yield return dataPoint;
// Make sure any point IDs with duplicated times directly follow
if (!enumerationComplete)
{
while (enumerator.Current.Time.CompareTo(publishTime) <= 0)
{
yield return enumerator.Current;
if (!enumerator.MoveNext())
{
completed.Add(index);
break;
}
}
}
}
index++;
}
// Remove completed enumerators
if (completed.Count > 0)
{
completed.Sort();
for (int i = completed.Count - 1; i >= 0; i--)
{
enumerators.RemoveAt(completed[i]);
}
completed.Clear();
}
}
while (enumerators.Count > 0);
}
}
// Gets the list of data point scanners used to
// scan the file for data belonging to this query.
private List<DataPointScanner> GetScanners()
{
List<DataPointScanner> dataPointScanners = new List<DataPointScanner>();
if (m_historianIDs != null && m_historianIDs.Any())
{
TimeTag startTime = m_startTime ?? TimeTag.MinValue;
TimeTag endTime = m_endTime ?? TimeTag.MaxValue;
int resumeFromHistorianID = 0;
bool includeStartTime = true;
// Set up parameters needed to properly resume a query after rollover
if ((object)m_resumeFrom != null)
{
resumeFromHistorianID = m_resumeFrom.HistorianID;
startTime = m_resumeFrom.Time ?? startTime;
includeStartTime = false;
}
// Create data point scanners for each historian ID
List<int> historianIDs = m_historianIDs.ToList();
historianIDs.Sort();
foreach (int historianID in historianIDs)
{
dataPointScanners.Add(new DataPointScanner(m_fileAllocationTable, historianID, startTime, endTime, includeStartTime, m_dataReadExceptionHandler));
if (historianID == resumeFromHistorianID)
includeStartTime = true;
}
}
return dataPointScanners;
}
#endregion
}
}