public override async Task <Message> HandleMessage(Message msg)
{
XmlReader reader;
if (msg is XMLMessage)
{
reader = ((XMLMessage)msg).GetReader();
}
else if (msg is IStreamMessage)
{
reader = XmlReader.Create(await((IStreamMessage)msg).GetStream());
}
else if (msg is IStringMessage)
{
reader = XmlReader.Create(new StringReader(((IStringMessage)msg).Value));
}
else
{
return(null);
}
return(await Task.Run <Message>(() =>
{
try
{
// Chain XmlReaders together to handle XIncludes, plugins
// and macro expansion.
// A pipeline within a pipeline within a pipeline.
XIncludingReader includingReader = new XIncludingReader(reader);
XPluginReader pluginReader = new XPluginReader(includingReader);
XDownstreamReader downstreamReader = new XDownstreamReader(pluginReader);
XUpstreamReader upstreamReader = new XUpstreamReader(downstreamReader);
var deserialiser = new XMeeplangDeserialiser();
var tree = deserialiser.Deserialise(upstreamReader);
return new DeserialisedPipeline
{
DerivedFrom = msg,
Tree = tree
};
}
catch (Exception ex)
{
logger.Error(ex, "{0} thrown when deserialising pipeline definition: {1}", ex.GetType().Name, ex.Message);
return null;
}
}));
}