/// <inheritdoc/>
public void ExecutePipeline(GracefulCancellationToken cancellationToken)
{
Exception exception = null;
try
{
_listener.OnNotify(this, new NotifyEventArgs(ProgressEventType.Debug, "Starting pipeline engine"));
if (!initialized)
{
throw new Exception(
"Engine has not been initialized, call Initialize(DataFlowPipelineContext context, params object[] initializationObjects");
}
var hasMoreData = true;
while (!cancellationToken.IsCancellationRequested && hasMoreData)
{
hasMoreData = ExecuteSinglePass(cancellationToken);
}
if (cancellationToken.IsAbortRequested)
{
Source.Abort(_listener);
foreach (var c in Components)
{
c.Abort(_listener);
}
Destination.Abort(_listener);
_listener.OnNotify(this,
new NotifyEventArgs(ProgressEventType.Information, "Pipeline engine aborted"));
return;
}
}
catch (Exception e)
{
exception = e;
_listener.OnNotify(this, new NotifyEventArgs(ProgressEventType.Error, "Data Flow Pipeline Engine execution threw Exception", e));
}
finally
{
_listener.OnNotify(this, new NotifyEventArgs(ProgressEventType.Debug, "Preparing to Dispose of DataFlowPipelineEngine components"));
_listener.OnNotify(this, new NotifyEventArgs(ProgressEventType.Trace, "About to Dispose " + Source));
try
{
Source.Dispose(_listener, exception);
}
catch (Exception e)
{
//dispose crashing is only a dealbreaker if there wasn't already an exception in the pipeline
if (exception == null)
{
throw;
}
_listener.OnNotify(Source, new NotifyEventArgs(ProgressEventType.Error, "Error Disposing Source Component", e));
}
foreach (IDataFlowComponent <T> dataLoadComponent in Components)
{
_listener.OnNotify(this, new NotifyEventArgs(ProgressEventType.Trace, "About to Dispose " + dataLoadComponent));
try
{
dataLoadComponent.Dispose(_listener, exception);
}
catch (Exception e)
{
//dispose crashing is only a dealbreaker if there wasn't already an exception in the pipeline
if (exception == null)
{
throw;
}
_listener.OnNotify(dataLoadComponent, new NotifyEventArgs(ProgressEventType.Error, "Error Disposing Component", e));
}
}
_listener.OnNotify(this, new NotifyEventArgs(ProgressEventType.Trace, "About to Dispose " + Destination));
try
{
Destination.Dispose(_listener, exception);
}
catch (Exception e)
{
//dispose crashing is only a dealbreaker if there wasn't already an exception in the pipeline
if (exception == null)
{
throw;
}
_listener.OnNotify(Destination, new NotifyEventArgs(ProgressEventType.Error, "Error Disposing Destination Component", e));
}
}
if (exception != null)
{
throw new Exception("Data Flow Pipeline Crashed", exception);
}
}
protected override void DoRetry()
{
Source.Abort();
Source = DLHandler.CreateRequest(Location);
Source.SendWebRequest();
}
