What's the difference between a UseCase and a Workflow?

seems to work fine for answer. However practical use case difference and when to use what. Both, JAX-WS and JAX-RS have standard implementations. I have come up with the following differences:
RESTful services (Mostly web integration, mobile phone apps)

This might help you Update: As Erik pointed, Celery is better choice for this case.
Celery:

wish of those help Channels in core.async are single put, single take. That is to say any message going in is given to only one taker. This doesn't work well in broadcast situations where many go blocks need a copy of each message put into a channel, then you need something else. This is what mult is useful for. Mult could probably also be called "broadcast"
Pub is then mult + multimethods. topic-fn is a function that is applied to each input item. The output of the function decides the topic of the message. The input message is then only broadcast to those subscribers who are listening to that topic.

wish helps you Rather than that I would use a general role (/actor) for the viewer like this:

wish of those help It depends on the complexity of your use case.
In a simple use case, we have a database column updated by multiple consumers for each stage in an Order lifecycle. This is done by a web service calling into the database. The simple lifecycle goes from ACKNOWLEDGED > ACCEPTED/REJECTED > FULFILLED > CLOSED. All of these are in the same table on the same column. This is executed in java classes with no workflow.