Writers

Coyote DX Writers have one simple purpose; write DataFrames to some target location / media. This DataFrame is always a clone of the working frame of the current Transaction Context unless there is a Mapper involved which will map fields of the working frame to the target frame for the writer to use..

Writers can write their frames to anything, files, databases, network sockets or to other frameworks through specializes API calls. There is no reason why a writer could not publish a DataFrame on a message queue or a pub-sub topic.

It is possible to have multiple writers in a transform job. The default to unconditionally writing all frames passing through the context, but it is also possible to define a boolean expression to control when a frame is written. This enables a "fan-out" and "router" pattern in your jobs.