public StartableBlock <DataBatch <Person> > Create(string targetFilePath, IProgress <PipelineProgress> progress, CancellationToken cancellation)
{
File.Create(targetFilePath).Dispose();
var builtSummary = new PeopleSummary();
// Create pipelines
var summaryFromDbPipeline = CreateSummaryFormDbPipeline(targetFilePath, progress, cancellation);
var writeEmptyLineBlock1 = new StartableBlock <object>(
() =>
{
if (!summaryFromDbPipeline.Completion.IsFaulted && !summaryFromDbPipeline.Completion.IsCanceled)
{
File.AppendAllLines(targetFilePath, new[] { string.Empty });
}
});
var peoplePipeline = CreatePeoplePipeline(targetFilePath, builtSummary, progress, cancellation);
var writeEmptyLineBlock2 = new StartableBlock <object>(
() =>
{
if (!peoplePipeline.Completion.IsFaulted && !peoplePipeline.Completion.IsCanceled)
{
File.AppendAllLines(targetFilePath, new[] { string.Empty });
}
});
var builtSummaryPipeline = CreateBuiltSummaryPipeline(targetFilePath, builtSummary, progress, cancellation);
// Link pipelines
summaryFromDbPipeline.ContinueWith(writeEmptyLineBlock1);
writeEmptyLineBlock1.ContinueWith(peoplePipeline);
peoplePipeline.ContinueWith(writeEmptyLineBlock2, false);
writeEmptyLineBlock2.ContinueWith(builtSummaryPipeline);
builtSummaryPipeline.Output.IgnoreOutput();
return(new StartableBlock <DataBatch <Person> >(
summaryFromDbPipeline.Start,
peoplePipeline.Output,
peoplePipeline.EstimatedOutputCount,
builtSummaryPipeline.Completion,
true));
}
