/// <summary>
/// Releases the unmanaged resources used by the <see cref="ConcentratorBase"/> object and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
protected virtual void Dispose(bool disposing)
{
if (!m_disposed)
{
try
{
if (disposing)
{
if (m_publicationTimer != null)
{
m_publicationTimer.Tick -= PublishFrames;
m_publicationTimer.Dispose();
}
m_publicationTimer = null;
if (m_frameQueue != null)
{
m_frameQueue.Dispose();
}
m_frameQueue = null;
if (m_monitorTimer != null)
{
m_monitorTimer.Elapsed -= MonitorUnpublishedSamples;
m_monitorTimer.Dispose();
}
m_monitorTimer = null;
if (m_latestMeasurements != null)
{
m_latestMeasurements.Dispose();
}
m_latestMeasurements = null;
m_lastDiscardedMeasurement = null;
}
}
finally
{
m_disposed = true; // Prevent duplicate dispose.
}
}
}
private bool m_disposed; // Disposed flag detects redundant calls to dispose method
#endregion
#region [ Constructors ]
/// <summary>
/// Creates a new <see cref="ConcentratorBase"/>.
/// </summary>
/// <param name="framesPerSecond">Number of frames to publish per second.</param>
/// <param name="lagTime">Past time deviation tolerance, in seconds - this becomes the amount of time to wait before publishing begins.</param>
/// <param name="leadTime">Future time deviation tolerance, in seconds - this becomes the tolerated +/- accuracy of the local clock to real-time.</param>
/// <remarks>
/// <para>
/// <paramref name="framesPerSecond"/> must be between 1 and 1000.
/// </para>
/// <para>
/// <paramref name="lagTime"/> must be greater than zero, but can be specified in sub-second intervals (e.g., set to .25 for a quarter-second lag time).
/// Note that this defines time sensitivity to past timestamps.
/// </para>
/// <para>
/// <paramref name="leadTime"/> must be greater than zero, but can be specified in sub-second intervals (e.g., set to .5 for a half-second lead time).
/// Note that this defines time sensitivity to future timestamps.
/// </para>
/// <para>
/// Concentration will not begin until consumer "Starts" concentrator (i.e., calling <see cref="ConcentratorBase.Start"/> method or setting
/// <c><see cref="ConcentratorBase.Enabled"/> = true</c>).
/// </para>
/// </remarks>
/// <exception cref="ArgumentOutOfRangeException">Specified argument is outside of allowed value range (see remarks).</exception>
protected ConcentratorBase(int framesPerSecond, double lagTime, double leadTime)
{
if (lagTime <= 0)
throw new ArgumentOutOfRangeException("lagTime", "lagTime must be greater than zero, but it can be less than one");
if (leadTime <= 0)
throw new ArgumentOutOfRangeException("leadTime", "leadTime must be greater than zero, but it can be less than one");
this.FramesPerSecond = framesPerSecond;
#if UseHighResolutionTime
m_realTimeTicks = PrecisionTimer.UtcNow.Ticks;
#else
m_realTime = DateTime.UtcNow.Ticks;
#endif
m_allowSortsByArrival = true;
m_lagTime = lagTime;
m_leadTime = leadTime;
m_lagTicks = (long)(m_lagTime * Ticks.PerSecond);
m_latestMeasurements = new ImmediateMeasurements(this);
// Create a new queue for managing real-time frames
m_frameQueue = new FrameQueue(this);
// Create high precision timer used for frame processing
m_publicationTimer = new PrecisionTimer();
m_publicationTimer.AutoReset = true;
m_publicationTimer.Tick += PublishFrames;
// This timer monitors the total number of unpublished samples every second. This is a useful statistic
// to monitor: if total number of unpublished samples exceed lag time, measurement concentration could
// be falling behind.
m_monitorTimer = new System.Timers.Timer();
m_monitorTimer.Interval = 1000;
m_monitorTimer.AutoReset = true;
m_monitorTimer.Elapsed += MonitorUnpublishedSamples;
}
private bool m_disposed; // Disposed flag detects redundant calls to dispose method
#endregion
#region [ Constructors ]
/// <summary>
/// Creates a new <see cref="ConcentratorBase"/>.
/// </summary>
/// <remarks>
/// Concentration will not begin until consumer "Starts" concentrator (i.e., calling <see cref="ConcentratorBase.Start"/> method or setting
/// <c><see cref="ConcentratorBase.Enabled"/> = true</c>).
/// </remarks>
protected ConcentratorBase()
{
#if UseHighResolutionTime
m_realTimeTicks = PrecisionTimer.UtcNow.Ticks;
#else
m_realTime = DateTime.UtcNow.Ticks;
#endif
m_allowSortsByArrival = true;
m_allowPreemptivePublishing = true;
m_downsamplingMethod = DownsamplingMethod.LastReceived;
m_latestMeasurements = new ImmediateMeasurements(this);
// Create a new queue for managing real-time frames
m_frameQueue = new FrameQueue(this.CreateNewFrame);
// Set minimum timer resolution to one millisecond to improve timer accuracy
PrecisionTimer.SetMinimumTimerResolution(1);
// Create publication wait handle
m_publicationWaitHandle = new AutoResetEvent(false);
// Create publication thread - this may be one of the few times when you can
// accurately argue that you need high priority thread scheduling...
m_publicationThread = new Thread(PublishFrames);
m_publicationThread.Priority = ThreadPriority.Highest;
m_publicationThread.Start();
// This timer monitors the total number of unpublished samples every second. This is a useful statistic
// to monitor: if total number of unpublished samples exceed lag time, measurement concentration could
// be falling behind.
m_monitorTimer = new System.Timers.Timer();
m_monitorTimer.Interval = 1000;
m_monitorTimer.AutoReset = true;
m_monitorTimer.Elapsed += MonitorUnpublishedSamples;
}
// Protected Methods
/// <summary>Shuts down concentrator in an orderly fashion.</summary>
protected virtual void Dispose(bool disposing)
{
if (!m_disposed)
{
if (disposing)
{
if (m_publicationTimer != null)
{
m_publicationTimer.Tick -= PublishFrames;
m_publicationTimer.Dispose();
}
m_publicationTimer = null;
if (m_frameQueue != null)
{
m_frameQueue.Dispose();
}
m_frameQueue = null;
if (m_monitorTimer != null)
{
m_monitorTimer.Elapsed -= MonitorUnpublishedSamples;
m_monitorTimer.Dispose();
}
m_monitorTimer = null;
if (m_latestMeasurements != null)
{
m_latestMeasurements.Dispose();
}
m_latestMeasurements = null;
}
}
m_disposed = true;
}
/// <summary>
/// Releases the unmanaged resources used by the <see cref="ConcentratorBase"/> object and optionally releases the managed resources.
/// </summary>
/// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
protected virtual void Dispose(bool disposing)
{
if (!m_disposed)
{
try
{
if (disposing)
{
DetachFromFrameRateTimer(m_framesPerSecond);
m_publicationThread = null;
if (m_publicationWaitHandle != null)
{
AutoResetEvent publicationWaitHandle = m_publicationWaitHandle;
m_publicationWaitHandle = null;
publicationWaitHandle.Set();
publicationWaitHandle.Close();
}
if (m_frameQueue != null)
{
m_frameQueue.Dispose();
}
m_frameQueue = null;
if (m_monitorTimer != null)
{
m_monitorTimer.Elapsed -= MonitorUnpublishedSamples;
m_monitorTimer.Dispose();
}
m_monitorTimer = null;
if (m_latestMeasurements != null)
{
m_latestMeasurements.Dispose();
}
m_latestMeasurements = null;
m_lastDiscardedMeasurement = null;
// Clear minimum timer resolution.
PrecisionTimer.ClearMinimumTimerResolution(1);
}
}
finally
{
m_disposed = true; // Prevent duplicate dispose.
if (Disposed != null)
Disposed(this, EventArgs.Empty);
}
}
}
