Hi,

suppose I want to periodically do the following 'work':

- access a database to obtain a 'lock' (only one of a bunch of scaled out 
services are to do the work at once)
- start some 'process' that periodically touches the lock
- interact with a remote resource (download a file from ftp server if available)
- retry N times if interaction fails
- process the file
- store some current state in the database
- stop the lock touching process
- done (lock times out)

I did something like this using actors but would now like to try it out with an 
akka-streams based approach, without using actors[1]; including the scheduling.

Can anyone provide me with a rough sketch witch kinds of stream components I 
should use and how?

- Do I need to create a sink that emits 'start' events based on a schedule? How 
would i do that?
- Would the touching process be a stream on its own that I create for every 
time the othet stream runs?
- How do I go about implementing the retry when the FTP interaction fails? Are 
the stateful stages meant for that?

etc.

Pointers to any resources that discuss roughly similar stuff would also be of 
great help.

Jan

[1] I am aware the akka-streams uses actors beneath :-)


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