Re: [basex-talk] ajax and http server - cross-domain, jsonp or proxy? - BaseX-Talk - mailman.uni-konstanz.de

30 Nov 2011

      Hello,

The support of jsonp would be very welcomed here, since several projects on
tge-adonis use or will use the basex.tge-adonis.fr/rest service...

For now, I went on with the proxy solution :
http://hyperdonat.tge-adonis.fr/basex/basex.html

Cheers,
Maud

On Sat, Oct 22, 2011 at 12:07 AM, <
basex-talk-request@mailman.uni-konstanz.de> wrote:
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Today's Topics:
1. Re: Performance of Basex 7.0 XQuery execution (Leo W?rteler)
  2. Re: Problems in using BaseX REST server -
     IncompatibleClassChangeError javax.ws.rs.core.Response$Status
     does not implement the requested interface (Pushkaraj Thorat)
  3. Re: ajax and http server - cross-domain,  jsonp or proxy?
     (Godmar Back)
  4. Re: ajax and http server - cross-domain,  jsonp or proxy?
     (Michael Seiferle)
----------------------------------------------------------------------
Message: 1
Date: Fri, 21 Oct 2011 14:12:50 +0200
From: Leo W?rteler <lw@basex.org>
To: Constantine Hondros <Constantine.Hondros@tomtom.com>
Cc: basex-talk <basex-talk@mailman.uni-konstanz.de>
Subject: Re: [basex-talk] Performance of Basex 7.0 XQuery execution
Message-ID: <4EA161C2.3060908@basex.org>
Content-Type: text/plain; charset=UTF-8; format=flowed
Dear Constantine,
Am 20.10.2011 09:44, schrieb Constantine Hondros:
...
Of course, I am really interested in more useful queries such as:
//tns:poi[not(tns:id = preceding-sibling::tns:poi/tns:id)]
this query basically compiles to two nested loops, the outer one
iterating over //tns:poi and the inner one over all preceding-siblings.
So it has an O(n^2) runtime.
...
I guess what I am asking is ... while most XPath queries I run are quick
to resolve, anything using preceding::, preceding-sibling:: or following::,
following-sibling:: essentially runs too slowly to be workable - at least,
on my sample dataset with about 100K sibling children of the root element.
Well, that's an extreme example, 100'000^2 is a huge number of nodes to
traverse. I performed some tests with
 a) 10'000 sibling elements inside the root:
    <root>
      <item id="1"/>
      <item id="2"/>
      [...]
      <item id="10000"/>
    </root>
and the query //item[not(preceding-sibling::*)]
b) 10'000 nested elements:
    <root>
      <item id="1">
        <item id="2">
          [...]
            <item id="10000"/>
          [...]
        </item>
      </item>
    </root>
and the query //item[not(ancestor::*)]
The timings I get are almost identical, replacing "preceding" with
"following" or "ancestor" with "descendant" doesn't change much.
...
So is this any sort of known issue? Should I be looking at any sort of
configuration options? Is there any way to profile the execution of the
Xpath?
My guess is that the number of nodes on the *-sibling-axes is usually
much bigger than on the vertical axes, so an expensive algorithm gets
unusable earlier.
To return to your example query, you could drastically reduce its
runtime by only traversing the database once, comparing each node only
to the nodes with unique tns:ids found before. I'll use a left fold [1][2]:
fold-left(
  function($seq, $x) {
    if($seq/tns:id = $x/tns:id) then $seq
    else ($seq, $x)
  },
  (),
  //tns:poi
)
If you're OK with using not-yet-standard XQuery extensions, a map [3]
instead of a sequence can potentially be even faster:
let $map :=
  fold-left(
    function($map, $x) {
      let $key := $x/tns:id
      return if(map:contains($map, $key)) then $map
       else map:new(($map, map:entry($key, $x)))
    },
    map:new(),
    //tns:poi
  )
for $key in map:keys($map)
return $map($key)
But this won't preserve the relative ordering of the results.
Hope that helped,
  Cheers Leo
__________
[1] http://www.w3.org/TR/xpath-functions-30/#func-fold-left
[2] http://en.wikipedia.org/wiki/Fold_%28higher-order_function%29
[3] http://docs.basex.org/wiki/Map_Functions
------------------------------
Message: 2
Date: Sat, 22 Oct 2011 01:40:23 +0530
From: Pushkaraj Thorat <pushkaraj.thorat.devl@gmail.com>
To: Rositsa Shadura <rositsa.shadura@uni-konstanz.de>
Cc: basex-talk@mailman.uni-konstanz.de
Subject: Re: [basex-talk] Problems in using BaseX REST server -
       IncompatibleClassChangeError javax.ws.rs.core.Response$Status does
not
       implement the requested interface
Message-ID:
       <CAH5ngE_gf655mnLuTCAjStd2X1cmWKJQk8xYTErMyFv4QnMYeQ@mail.gmail.com
...
Content-Type: text/plain; charset="iso-8859-1"
Thanks Rositsa!
It is bit late to reply, but indeed it is a good to know.
Regards
Pushkaraj
On Fri, Mar 4, 2011 at 3:01 AM, Rositsa Shadura <
rositsa.shadura@uni-konstanz.de> wrote:
...
Hi all,
I've just managed accidentally to reproduce the error. I noticed that the
class javax.ws.rs.core.Response.**Status is defined in both
jsr311-api-1.0.jar and jersey-core-1.4.jar but only the class in the
jersey-core JAR implements the interface
javax.ws.rs.core.Response.**StatusType.
This is why it is important that the jersey-core JAR appears before the
jsr311-api JAR in the classpath. When not the error occurs.
Greetings,
Rositsa
On Thu, 20 Jan 2011 12:03:45 +0100, Michael Seiferle <
michael.seiferle@uni-**konstanz.de <michael.seiferle@uni-konstanz.de>>
wrote:
Hi Pushkaraj,
...
thanks in return for your response.
I will see if I can reproduce that in my VM; so far you are the first
one
...
to report this issue, I'll let you know what I can find.
Kind regards
Michael
Am 19.01.2011 um 20:19 schrieb Pushkaraj Thorat:
Thanks for your response Michael,
...
I am using java 1.6
pushkaraj@toothless:~$ java -version
java version "1.6.0_17"
Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
Java HotSpot(TM) Server VM (build 14.3-b01, mixed mode)
pushkaraj@toothless:~$
Just to update, the rest server ran successfully on my windows machine.
Not sure what problem faced on the linux(ubuntu) machine. I will debug
once
...
I get some time.
Thanks, Pushkaraj
On Tue, Jan 18, 2011 at 3:46 AM, Michael Seiferle
<michael.seiferle@uni-
**konstanz.de <michael.seiferle@uni-konstanz.de>> wrote:
Dear Pushkaraj,
I am deeply sorry for you having to mess around with that erroneous
startup scripts.
We fixed them in both the ZIP & DMG distribution, feel free to download
them again.
...
...
java.lang.**IncompatibleClassChangeError
We have been trying to reproduce this error -  but to no avail.
Your error message might have to do something with your Java Version;
please make sure you are running the latest version.
Hope this helps! In case it does not, feel free to ask for more.
Kind regards
Michael
Am 17.01.2011 um 22:00 schrieb Pushkaraj Thorat:
...
I am doing setup for REST enabled basex database with procedure
mentioned in http://docs.basex.org/wiki/**JAX-RX_API<;
http://docs.basex.org/wiki/JAX-RX_API>URL.
Configuring & starting server and running failed due to class not
found, but later I've modified the ./basexrest script as: (Included
all the
jars in lib folder)
######START
#!/bin/bash
# Path to this script
PWD=`dirname $0`
# Paths to distributed files or source directories
BASEX=$PWD/BaseX.jar
BASEXAPI=$PWD/../lib/basex-**api.jar
# Classpath
LIB=$PWD/../lib
LIB_CP=""
for JAR_FILE in $LIB/*.jar
do
      LIB_CP="$LIB/$JAR_FILE:$LIB_**CP"
done
CP=$BASEX:$BASEXAPI:$LIB_CP
# Options for virtual machine
VM=-Xmx1g
# Run REST server
java -cp "$CP" $VM org.basex.api.jaxrx.**JaxRxServer "$@"
######END
after this, server started successfully, hit the URL -
http://localhost:8984/basex/**jax-rx<;
http://localhost:8984/basex/jax-rx>I am getting following exception:
java.lang.**IncompatibleClassChangeError: Class
javax.ws.rs.core.Response$**Status does not implement the requested
interface javax.ws.rs.core.Response$**StatusType
      at
com.sun.jersey.spi.container.**ContainerResponse.getStatus(**
ContainerResponse.java:548)
      at com.sun.jersey.spi.container.**ContainerResponse$**
CommittingOutputStream.**commitWrite(ContainerResponse.**java:156)
      at com.sun.jersey.spi.container.**ContainerResponse$**
CommittingOutputStream.write(**ContainerResponse.java:133)
      at org.basex.io.BufferedOutput.**flush(BufferedOutput.java:50)
      at org.basex.io.PrintOutput.**flush(PrintOutput.java:126)
      at org.basex.data.XMLSerializer.**cls(XMLSerializer.java:206)
      at org.basex.data.Serializer.**close(Serializer.java:219)
      at org.basex.api.jaxrx.BXJaxRx$1.**code(BXJaxRx.java:96)
      at org.basex.api.jaxrx.BXCode.**run(BXCode.java:53)
      at org.basex.api.jaxrx.BXOutput.**write(BXOutput.java:53)
      at com.sun.jersey.core.impl.**provider.entity.**
StreamingOutputProvider.**writeTo(**StreamingOutputProvider.java:**71)
      at com.sun.jersey.core.impl.**provider.entity.**
StreamingOutputProvider.**writeTo(**StreamingOutputProvider.java:**57)
      at com.sun.jersey.spi.container.**ContainerResponse.write(**
ContainerResponse.java:299)
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Re: [basex-talk] ajax and http server - cross-domain, jsonp or proxy?

Maud Ingarao

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