[xep-support] Re: How often does XEP.BAT use my graphic-URL?

Also note:

> Are there any reasons why the rendering process doesnt use the TMPDIR for
caching purposes?

What is TMPDIR set to in your xep.xml?

Kevin

From: Xep-support <xep-support-bounces@renderx.com> On Behalf Of Vladyslav
Sivyakov
Sent: Wednesday, August 5, 2020 12:27 PM
To: xep-support@renderx.com
Subject: [xep-support] Re: How often does XEP.BAT use my graphic-URL?

Hello Fritz,

Your media server controls the expiration policy of your media files. The
HTTP "Expires:" header is in charge of telling the HTTP client when the file
is to be re-requested.

I've failed check it myself because mrq12.it2media.de:8081 may not be
accessible from the outside, but could it be that the HTTP server returns a
bogus "Expires:" header (e.g. if it has a wrongly set system clock) or does
not return it at all?

To verify, please simply call the following and see the console output:

curl -D -
http://mrq12.it2media.de:8081/mr/v01/~~~200/mediafile/id/41511906/filetype/p
df?mimetype=true

Best regards,
Vladyslav Y. Sivyakov, RenderX.

On 03.08.2020 10:19, Kirch Fritz wrote:

Hello Vladyslav,

thank you for your quick answer, but let us concentrate on the small example
fo-file!

It has only 1 external-graphic.

I can understand, that throughout the formatting process, XEP has to
retrieve various information about the external resource.

But referring to my small example, why does this retrieval process read the
one and only graphic file 3 times?

Are there any reasons why the rendering process doesnt use the TMPDIR for
caching purposes?

Please apologize my perseverance in getting an answer, but my media server
is called 100.000 times a day for providing graphic files.

If there is a small chance to reduce the number of calls, I will be happy.

Fritz

Von: Xep-support <mailto:xep-support-bounces@renderx.com>
<xep-support-bounces@renderx.com> Im Auftrag von Vladyslav Sivyakov
Gesendet: Freitag, 31. Juli 2020 21:02
An: xep-support@renderx.com <mailto:xep-support@renderx.com>
Betreff: [xep-support] Re: How often does XEP.BAT use my graphic-URL?

Hello Fritz,

Throughout the formatting process, XEP retrieves various information about
the external resources, like dimensions.

Caching the entire content is problematic because in large documents, the
total size of external resources would make the Java environment on a
formatting machine quickly run out of memory.

There is a standard solution for that -- XML Catalogs. You make a local copy
of frequently-used resources and configure a Catalog Resolver do the job.
Simple ones simply return local files (file:) instead of those located on
remote (http:) computers, but nothing prevents from implementing your own
sophisticated one that has some timed-cache strategy and periodically
refreshed entities.

A typical usage is when you're developing DocBook documents, and each
rendering process takes an http hit to docbook.sourceforge.net. Of course,
this makes rendering slow, and you may want to improve it. Here's more
details:

 <http://www.renderx.com/reference.html#URI_Resolution>
http://www.renderx.com/reference.html#URI_Resolution

 <http://www.renderx.com/reference.html#using_catalogs_for_docbook>
http://www.renderx.com/reference.html#using_catalogs_for_docbook

 <https://www.oasis-open.org/committees/entity/spec-2001-08-06.html>
https://www.oasis-open.org/committees/entity/spec-2001-08-06.html

Alternatively, a caching proxy could be a solution, but it may be an
overhead and depend on your needs.

Best regards,
Vladyslav Y. Sivyakov, RenderX.

On 31.07.2020 09:44, Kirch Fritz wrote:

Hi RenderX-Support Team, hi Kevin

in my FO-file (see below and in appendix) you can find excatly one call of
<fo:external-graphic> with a url to my graphic file.

When I use XEP.BAT to render FO into XEPOUT intermediate format, my server
protocoll told me, that there are 3 calls fetching the pdf-graphic from my
server.

I am wondering, why there are 3 calls?

With the processing instruction xep-out-embed-images:

    FO -> XEP calls my media server 3 times and XEP -> PDF calls my
media server 0 times

Without the processing instruction xep-out-embed-images:

    FO -> XEP calls my media server 2 times and XEP -> PDF calls my
media server 4 times

How can I minimize the number of calls to my media server?

Fritz Kirch

IT2media GmbH & Co KG

Nuremberg, Germany

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Received on Wed Aug 5 12:32:34 2020