Posted by Alessandro Vernet on
URL: https://discuss.orbeon.com/Execution-order-of-generateXXX-Functions-for-Processors-with-multiple-outputs-tp3537744p3551691.html

Hi René,

The output of your processor will be read in the order in which the data is needed by the processor(s) those outputs are connected to. Say you have outputs A and B, with A connected to the 'config' input of and XSLT processors and B to the 'data' input of that same XSLT processor. In that case, you can be pretty sure A will be read before B, because when the XSLT processor runs, it will first need to read the stylesheet (== 'config' input).

But in general, you shouldn't assume any particular order. Often you are in a case where whatever output is read first, you need to do some work, store the result (a "state"), and read from that state when subsequence output are read. For this purpose, ProcessorImpl provides the methods setState() and getState(). You can find more about this on:

http://wiki.orbeon.com/forms/doc/developer-guide/api-xpl-processor-api#TOC-Processor-instance-state

Alex