Relay service should be an adapter.

[MRIIOT]

An adapter in the current context of Ladder99 is nothing more than a component with a source, a sink, and transformational logic revolving around a cache instance driven by input.yaml and output.yaml.

Current Relay specialization:

• querying MTConnect Agent endpoint (HTTP XML)
• writing to a database (SQL).

Current Relay responsibilities:

• database migration/upgrade
• transform MTConnect XML representation to sql
• transferring MTConnect structure to db
• writing DataItems to db

Future Relay specialization as a MTConnect adapter:

• querying MTConnect Agent endpoint (HTTP XML)
• sink?

Future Relay responsibilities as a MTConnect adapter:

• transform MTConnect XML representation to ?