[Laszlo-dev] for review, Change 20071028-hqm-6, put XML parser back into server data proxy pipeline, to do charset transcoding

[Henry Minsky]

Yes, Tomcat sends the output as "chunked" when LPS is proxying a 1.6 MB data
file with this patch.


On 10/31/07, Henry Minsky <henry.minsky at gmail.com> wrote:
>
> Note, that this code does not know the content length before it starts
> writing the output to
> the client, since it's being streamed.  So it doesn't set the content
> length explicitly, like it used to.
>
> My understanding of Tomcat's behavior is that if the content is small
> enough to fit in some tomcat output
> buffer size , it will buffer it and then send it all with a content length
> header. If it is larger than that
> then Tomcat sends it in HTTP chunked encoding. I still have to verify this
> with a very large file.
>
>
> On 10/28/07, Henry Minsky <henry.minsky at gmail.com> wrote:
> >
> > Change 20071028-hqm-6 by hqm at IBM-2E06404CB67 on 2007-10-28 20:42:12 EDT
> >     in /cygdrive/c/users/hqm/openlaszlo/trunk
> >     for http://svn.openlaszlo.org/openlaszlo/trunk
> >
> > Summary: put XML parser back into server data proxy pipeline, to do
> > charset transcoding
> >
> > New Features:
> >
> > Bugs Fixed: LPP-4924
> >
> > Technical Reviewer: max
> > QA Reviewer: pablo
> > Doc Reviewer:
> >
> > Details:
> >
> > The server data proxy now uses the XMLPULL parser to parse
> > the data from the backend, in order to use Java to force a translation
> > into UTF-8
> > coding if needed.
> >
> > This change also uses a worker Thread to read from the backend, while
> > simultaneously
> > pipelining the data back throug the XML PULL parser to the client.
> > This should improve
> > response time and also removes a potential memory overflow and DOS
> > attack on the server.
> >
> > Tests:
> >
> > test/lfc/data/alldata.lzx
> > amazon
> > calendar
> >
> >
> > Files:
> > D      WEB-INF/lib/xpp3-1.1.3.4d_b4.jar
> > A      WEB-INF/lib/xpp3-1.1.4c.jar
> > M      WEB-INF/lps/lfc/kernel/swf/LzLoadQueue.as
> > A      WEB-INF/lps/server/src/org/openlaszlo/data/HttpData.java
> > M      WEB-INF/lps/server/src/org/openlaszlo/data/XMLGrabber.java
> > M      WEB-INF/lps/server/src/org/openlaszlo/data/HTTPDataSource.java
> > M      WEB-INF/lps/server/src/org/openlaszlo/data/DataSource.java
> >
> >
> >
> > --
> > Henry Minsky
> > Software Architect
> > hminsky at laszlosystems.com
> >
>
>
>
> --
> Henry Minsky
> Software Architect
> hminsky at laszlosystems.com
>
>


-- 
Henry Minsky
Software Architect
hminsky at laszlosystems.com
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