[kepler-users] Collecting Inputs (accumulation of data)

[Stefan Proell]

Dear Kepler-Community,
I have another question regarding the design of a complex workflow.

I collect files from a Web server and run these through a Web service, 
that performs some analysis of these files. So far this works nicely. I 
receive a string for each file as a result  (by using a Ramp-Loop) and I 
need to write these strings in a single file line by line. This would 
not be a problem, if there wasn't a special file format, which requires 
me to write additional metadata before the strings and to eliminate 
possible duplicates. I need to accumulate all the result strings, check 
them for duplicates and then process them further and therefore I need 
to have a collection of all that strings. How can I achieve this, that 
the actor (I wrote myself) waits for all the strings to arrive and then 
start the processing?

What am I missing? Is there a "wait for the previous actor stopped 
fireing"-option or how would I do that?

Thanks in advance,
Stefan