I have a search function that calls other search functions that are independent
of each other. The master search function takes the results of these sub-search
functions and compiles and processes them according to some rules.
I would like the sub-search functions to all execute in parallel at the same
time to reduce the response time of the call to the master search function.
I tried using xdmp:http-post and xdmp:invoke both in for loops and also without
for loops.
for example:
*xdmp:http-post (for loop) does not execute in parallel:
let $sub-search-results :=
for $sub-search in $sub-searches
return xdmp:http-post($endpoint....)
let $subsearch-results :=
<subsearch-results>
{$sub-search-results}
</subsearch-results>
return $sub-search-results
*xdmp:http-post (no for loop) DOES execute in parallel:
let $sub-search-result-1 := xdmp:http-post($endpoint....)
let $sub-search-result-2 := xdmp:http-post($endpoint....)
let $sub-search-result-3 := xdmp:http-post($endpoint....)
let $sub-search-result-4 := xdmp:http-post($endpoint....)
let $subsearch-results :=
<subsearch-results>
{$sub-search-result-1}
{$sub-search-result-2}
{$sub-search-result-3}
{$sub-search-result-4}
</subsearch-results>
return $sub-search-results
I tried similar approaches using xdmp:invoke (both with and without a for loop)
but neither would execute in parallel.
Does this sound right? I was expecting to be able to get parallel execution in
a for loop using xdmp:http-post (I even tried fn:unordered but it had not
effect). and I was expecting to get parallel execution using xdmp:invoke
somehow but I couldn't.
The http-post approach isn't too bad for my situation but it feels like a
little bit of a hack just to get parallel execution. Are there any other ways?
thanks,
Ryan
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