public static ReadOnlyCollection<PipelineStep> For(PipelineAttribute annotation)
{
// temporary variable is introduced in order
// not to get a crash when the cache is invalidated upon new assembly load
var cache = _cache;
if (!cache.ContainsKey(annotation))
{
lock (_cacheLock)
{
if (!cache.ContainsKey(annotation))
{
var t_a_method = annotation.StepMarker;
var t_a_type = annotation.WorkshopMarker;
var t_a_asm = annotation.PlantMarker;
// todo. cache this and invalidate cache on appdomain changes
_cache.Add(annotation, AppDomain.CurrentDomain.GetAssemblies().SelectMany(asm =>
{
var a_asm = asm.AttrOrNull(t_a_asm).AssertCast<PipelinePlantAttribute>();
if (a_asm == null)
{
return Enumerable.Empty<PipelineStep>();
}
else
{
return asm.GetTypes().SelectMany(t =>
{
var a_type = t.AttrOrNull(t_a_type).AssertCast<PipelineWorkshopAttribute>();
if (a_type == null)
{
return Enumerable.Empty<PipelineStep>();
}
else
{
return t.GetMethods(BF.All).SelectMany(m =>
{
var a_method = m.AttrOrNull(t_a_method).AssertCast<PipelineStepAttribute>();
if (a_method == null)
{
return Enumerable.Empty<PipelineStep>();
}
else
{
return new PipelineStep(a_asm, a_type, a_method, m).MkArray();
}
});
}
});
}
}).Order().ToReadOnly());
}
}
}
// temporary variable is used in order
// not to get a crash when the cache is invalidated upon new assembly load
return cache[annotation];
}
public static IPipeline BuildPipeline(PipelineAttribute metadata, String name)
{
var steps = Registry.For(metadata);
return new Impl.Pipeline(name, metadata, steps);
}
public static IPipeline BuildPipeline(PipelineAttribute metadata)
{
return BuildPipeline(metadata, null);
}