/// <summary>
/// Performs one time initialization of the output target(s), e.g. open output file(s).
/// This method is only called when the InitErrorOccurred property is accessed for the first time
/// (which may not happen at all in case intake initialization fails).
/// </summary>
/// <returns>true if initialization successful; false if not, e.g. file not found</returns>
private bool InitOutput()
{
// Note that in order for the exceptions to be caught in the try blocks below, CreateLineDispenser (or OutputInitializer as applicable) processing
// must be eagerly evaluated (no deferred execution).
if (_outputToWriter)
{
try
{
//In case both OutputWriters and OutputFileNames are present, then OutputWriters wins
_outputFileWriter = _config.OutputWriters == null?LineDispenserCreator.CreateLineDispenser(_config.OutputFileNames.ToListOfStrings('|'), _config.OutputDataKind, _config.AsyncOutput, X12Delimiters == null?null : new Lazy <string>(() => X12Delimiters().X12SegmentDelimiter), _config.XmlJsonOutputSettings)
: LineDispenserCreator.CreateLineDispenser(_config.OutputWriters(), _config.OutputDataKind, _config.AsyncOutput, X12Delimiters == null ? null : new Lazy <string>(() => X12Delimiters().X12SegmentDelimiter), _config.XmlJsonOutputSettings);
//Lazy here allows delimiters to be evaluated AFTER the first intake row (such as ISA segment), so that in absence of delimiters in config, they can be copied from intake
}
catch (Exception ex)
{
//something went wrong with output file(s) or text writer(s), there is not much we can do other than to report it
var errMsg = _config.IntakeReaders == null ? $"Attempt to create output file(s) '{_config.OutputFileNames}' failed."
: "Attempt to open text writer(s) failed.";
_config.Logger.LogFatal(errMsg, ex);
return(false);
}
return(true);
}
else //output to OutputConsumer or (OutputConsumerAsync) action
{
string errMsg;
try
{
errMsg = _config.OutputInitializer(_globalCache);
}
catch (Exception ex)
{
_config.Logger.LogFatal("Output initializer threw exception.", ex);
return(false);
}
if (errMsg != null)
{
_config.Logger.LogFatal("Output initializer failed:\r\n" + errMsg);
return(false);
}
return(true);
}
}