public bool IsAllowable(Pipeline pipeline)
{
// Pipeline is not compatible with the execution context of the pipeline use case
if (!_context.IsAllowable(pipeline))
{
return(false);
}
try
{
// Does the pipeline contain any components that are invalid under the current list of available initialization objects etc
foreach (var component in pipeline.PipelineComponents)
{
var type = component.GetClassAsSystemType();
if (type == null)
{
return(false);
}
var advert = new AdvertisedPipelineComponentTypeUnderContext(type, this);
if (!advert.IsCompatible())
{
return(false);
}
}
}
catch (Exception)
{
// if any Pipeline components are broken e.g. not possible to find the Type they reference
// then we tell the user it is not compatible
return(false);
}
// nothing incompatible here
return(true);
}
/// <inheritdoc/>
public IDataFlowPipelineEngine Create(IPipeline pipeline, IDataLoadEventListener listener)
{
string reason;
if (!_context.IsAllowable(pipeline, out reason))
{
throw new Exception("Cannot create pipeline because: " + reason);
}
var destination = GetBest(_useCase.ExplicitDestination, CreateDestinationIfExists(pipeline), "destination");
var source = GetBest(_useCase.ExplicitSource, CreateSourceIfExists(pipeline), "source");
//new DataFlowPipelineEngine<T>(_context, source, destination, listener, pipeline);
//engine (this is the source, target is the destination)
var dataFlowEngine = (IDataFlowPipelineEngine)_constructor.ConstructIfPossible(_engineType, _context, source, destination, listener, pipeline);
//now go fetch everything that the user has configured for this particular pipeline
foreach (PipelineComponent toBuild in pipeline.PipelineComponents)
{
//if it is the destination do not add it
if (toBuild.ID == pipeline.DestinationPipelineComponent_ID)
{
continue;
}
//if it is the source do not add it
if (toBuild.ID == pipeline.SourcePipelineComponent_ID)
{
continue;
}
//get the factory to realize the freaky Export types defined in any assembly anywhere and set their DemandsInitialization properties based on the Arguments
object component = CreateComponent(toBuild);
//Add the components to the pipeline
dataFlowEngine.ComponentObjects.Add(component);
}
return(dataFlowEngine);
}