These are excellent ideas Leszek, I sincerely thank you.
Will implement them over the coming days, especially the pipeline one below!
brgds
Paul
On 10/24/2011 1:40 PM, Leszek Gawron wrote:
On 2011-10-24 19:22, Paul Joseph wrote:
I think you may have the solution--I am indeed putting in a very heavy
weight object into the continuation. Let me go through this code and
get back to you with questions if I may.
I simply remember what used to kill my site and what made up my first
commits as cocoon commiter :)
have fun
Please DO enable session-bound-continuations! You gain:
- all continuations simply "vanish" for an expired session
- there is no single continuations collection
- you will prevent very strange errors where there is still a
continuation that you can invoke but there actually is no user session
anymore. Been there, broke that ;)
Remember that even though you delete heavy object from flowscript your
implementation is still not "memory nice". You need to generate
VeryLargeObject, render it and then forget it. Imagine 10 users doing
it at the same time - kills your server anyway.
There are two solutions:
- some Result object which does not hold all data but actually is an
open rowset wrapper. Your jx:template iterates the rowset. The data is
fetched from db as you go. Remember to finalize your resources in a
cleanup function.
- custom generator that queries database directly and emits SAX events.
Both solutions let you generate results on almost ANY size. One more
gotcha: if you generate large responses please mind that by default
cocoon buffers the whole response before it's streamed to client (just
in case an exception throws in the middle it can send a nice HTTP 500
instead of data broken in the middle). This introduces a momory strain
on the server and a significant response delay (data is not being sent
to client until it's fully generated).
If you are willing to accept inferior error handling you can disable
this buffering for memory intensive pipelines (outputBufferSize):
<map:pipeline>
<map:parameter name="outputBufferSize" value="0"/>
<map:act type="set-header">
<map:parameter name="Expires" value="-1"/>
<map:parameter name="Cache-Control" value="no-cache"/>
<map:parameter name="Pragma" value="no-cache"/>
</map:act>
<map:match pattern="view/*.jx">
<map:generate type="jx" src="view/{1}.jx"/>
<map:transform src="stylesheets/prefixes.xsl"/>
<map:serialize type="xml"/>
</map:match>
<map:match pattern="text-view/*.jx">
<map:generate type="jx" src="view/{1}.jx"/>
<map:serialize type="text"/>
</map:match>
<map:match pattern="listCoupons.do">
<map:generate type="coupons"/>
<map:serialize type="xml"/>
</map:match>
<map:match pattern="*.do">
<map:call function="{1}"/>
</map:match>
</map:pipeline>
lg
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