/// <summary>
/// Stop monitoring of events.
/// </summary>
/// <returns></returns>
public async Task <StopResult> StopAsync()
{
// Check if already stopped.
if (_cancellationTokenSource == null)
{
return(new StopResult());
}
Interlocked.Exchange(ref _shuttingDown, 1);
var endTime = DateTime.UtcNow;
if (_cancellationTokenSource != null)
{
_cancellationTokenSource.Cancel();
_cancellationTokenSource = null;
}
// the stop procedure takes about a minute, so we fire and forget.
StopEventProcessorClientAsync().SafeFireAndForget(e => _logger.LogError(e, "Error while stopping event monitoring."));
// Stop checkers and collect resutls.
var missingTimestampsCounter = _missingTimestampsChecker.Stop();
var maxMessageProcessingDelay = _messageProcessingDelayChecker.Stop();
var maxMessageDeliveryDelay = _messageDeliveryDelayChecker.Stop();
var valueChangesPerNodeId = _valueChangeCounterPerNodeId.Stop();
var allExpectedValueChanges = true;
if (_currentConfiguration.ExpectedValueChangesPerTimestamp > 0)
{
// TODO collect "expected" parameter as groups related to OPC UA nodes
allExpectedValueChanges = valueChangesPerNodeId?
.All(kvp => (_totalValueChangesCount / kvp.Value) ==
_currentConfiguration.ExpectedValueChangesPerTimestamp
) ?? false;
_logger.LogInformation("All expected value changes received: {AllExpectedValueChanges}",
allExpectedValueChanges);
}
var incompleteTimestamps = _missingValueChangesChecker.Stop();
var incrCheckerResult = _incrementalIntValueChecker.Stop();
var stopResult = new StopResult()
{
ValueChangesByNodeId = new ReadOnlyDictionary <string, int>(valueChangesPerNodeId ?? new Dictionary <string, int>()),
AllExpectedValueChanges = allExpectedValueChanges,
TotalValueChangesCount = _totalValueChangesCount,
AllInExpectedInterval = missingTimestampsCounter == 0,
StartTime = _startTime,
EndTime = endTime,
MaxDelayToNow = maxMessageProcessingDelay.ToString(),
MaxDeliveyDuration = maxMessageDeliveryDelay.ToString(),
DroppedValueCount = incrCheckerResult.DroppedValueCount,
DuplicateValueCount = incrCheckerResult.DuplicateValueCount,
};
return(stopResult);
}
/// <summary>
/// Stop monitoring of events.
/// </summary>
/// <returns></returns>
public Task <StopResult> StopAsync()
{
_logger.LogInformation("StopAsync called.");
var sw = Stopwatch.StartNew();
try {
// Check if already stopped.
if (_cancellationTokenSource == null)
{
return(Task.FromResult(new StopResult()));
}
var endTime = DateTime.UtcNow;
if (_cancellationTokenSource != null)
{
_cancellationTokenSource.Cancel();
_cancellationTokenSource = null;
}
// Stop event monitoring and deregister handler.
if (_clientWrapper != null)
{
_clientWrapper.StopProcessing();
_clientWrapper.ProcessEventAsync -= Client_ProcessEventAsync;
}
// Stop checkers and collect resutls.
var missingTimestampsCounter = _missingTimestampsChecker.Stop();
var maxMessageProcessingDelay = _messageProcessingDelayChecker.Stop();
var maxMessageDeliveryDelay = _messageDeliveryDelayChecker.Stop();
var valueChangesPerNodeId = _valueChangeCounterPerNodeId.Stop();
var allExpectedValueChanges = true;
if (_currentConfiguration.ExpectedValueChangesPerTimestamp > 0)
{
// TODO collect "expected" parameter as groups related to OPC UA nodes
allExpectedValueChanges = valueChangesPerNodeId?
.All(kvp => (_totalValueChangesCount / kvp.Value) ==
_currentConfiguration.ExpectedValueChangesPerTimestamp
) ?? false;
_logger.LogInformation("All expected value changes received: {AllExpectedValueChanges}",
allExpectedValueChanges);
}
var incompleteTimestamps = _missingValueChangesChecker.Stop();
var incrCheckerResult = _incrementalIntValueChecker.Stop();
var incrSequenceResult = _incrementalSequenceChecker.Stop();
var stopResult = new StopResult()
{
ValueChangesByNodeId = new ReadOnlyDictionary <string, int>(valueChangesPerNodeId ?? new Dictionary <string, int>()),
AllExpectedValueChanges = allExpectedValueChanges,
TotalValueChangesCount = _totalValueChangesCount,
AllInExpectedInterval = missingTimestampsCounter == 0,
StartTime = _startTime,
EndTime = endTime,
MaxDelayToNow = maxMessageProcessingDelay.ToString(),
MaxDeliveyDuration = maxMessageDeliveryDelay.ToString(),
DroppedValueCount = incrCheckerResult.DroppedValueCount,
DuplicateValueCount = incrCheckerResult.DuplicateValueCount,
DroppedSequenceCount = incrSequenceResult.DroppedValueCount,
DuplicateSequenceCount = incrSequenceResult.DuplicateValueCount,
ResetSequenceCount = incrSequenceResult.ResetsValueCount,
RestartAnnouncementReceived = _restartAnnouncementReceived,
};
return(Task.FromResult(stopResult));
}
finally {
_logger.LogInformation("StopAsync finished in {elapsed}", sw.Elapsed);
}
}