Kepler

The CompositeCoactor class extends TypedCompositeActor (and implements Coactor) to provide a mechanism for implementing coactors from SDF sub-workflows of conventional actors. Data is extracted from the read scope using input ports named according to the types of data to be extracted, e.g., a port named 'StringToken' will extract a single string token out of the current read scope and provide it as input to the subworkflow on each firing; a port named 'StringToken+' will provide an array token containing one or more string tokens extracted from the read scope on each firing, etc.

Currently, metadata or annotations applied to the top-level collection in a scope-match can also be extracted by specifying the key for the metadata element required (e.g., by naming a port 'StringToken [key=filename]'). One thing that can't be done is to access metadata applied to collections above the read scope and cascading down to it. This function would be very useful for reusing information across multiple invocations of a composite coactor.