[MarkLogic Dev General] (no subject)

Wayne Feick wayne.feick at marklogic.com
Mon Oct 27 10:01:05 PST 2008


Have you considered inserting process-me.xml in a separate eval with an
option of <isolation>different-transaction</isolation> to ensure it is
available before when inserting cpf-init.xml?

Wayne.


On Mon, 2008-10-27 at 11:29 -0500, Strawn, Shane wrote:

> Hello,
> 
> I have a somewhat convoluted issue to describe so I'll try to make
> sense:
> 
> I have a Content Processing Framework process which watches a
> directory for a file to be dropped on it.  This is a different
> database than my main content database.
> 
> I have an xquery module which at the same time inserts a document into
> the content database, and the above file into the CPF database in an
> eval, like so:
> 
>         xdmp:document-insert( "process-me.xml", <data>…</data>) 
>>         xdmp:eval('xdmp:document-insert( "cpf-init.xml", 
>                 <target-uri>process-me.xml</target-uri>)', $options (:
> setting db to content :) )
> 
> Now, since these are in different dbs, it sometimes occurs where the
> CPF process will look for "process-me.xml" on the content db but not
> find it, because it is not finished document-inserting.  I thought it
> should complete the doc-insert before moving on to the eval in the
> module, but it apparently doesn't due to the separate-transaction
> nature of the situation?
> 
> I would like to find a way to loop or wait until my doc is fully
> inserted within xquery, rather than the more complex tasks of
> modifying the CPF pipeline or changing the interface to add another
> click-through after the doc is inserted, if possible.  But I'm not
> sure how to accomplish this or if it's realistic.
> 
> I've tried some (probably) stupid things such as:
> 
> Killing a set amount of time with a statement like 
>         let $timekill := for $a in (1 to 10000000) return () 
> …but this seems unreliable, and a waste of time if it doesn't need it;
> 
> Or a recursive function like 
>         define function check-doc-exists($uri as xs:string) { 
>         if ( fn:exists(fn:doc($uri)) ) then fn:true() else
> check-doc-exists($uri) } 
> …but this gives me Stack Overflow within seconds, or if I put my
> timekiller in it, it never finds the doc even if it inserts while it
> is running.
> 
> Is there something I can do here to create a loop which runs until it
> can find the document?  Am I misunderstanding what is happening with
> the transaction?  Just how wrong are my above ideas?
> 
> Thanks in advance for any guidance.
> 
> Shane Strawn 
> Wolters Kluwer Health
> 
> 
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