Re: [xmlblaster-devel] Using GnuRegexFilter

[Marcel Ruff <mr at marcelruff.info>]

Matthew Sargent wrote:
> Hi,
>  
> I have a problem. I subscribe to xmlBlaster using an XPath that 
> specifies a certain value on the key. An initial message is posted that 
> does not have that value in the key, then later an update is posted that 
> does. Since the key is immutable, it is not changed and I do not get the 
> update message. I think I can I use the GnuRegexFilter to register a 
> filter that looks in the body of each message for the value I am 
> seeking, is that true? 
>  
> When I attempt to do that, I get no messages back at all. Does anyone 
> have an example using the GnuRegexFilter for a subscribe? In my code, if 
> I take out the addAccessFilter with my regex expression, I get all the 
> messages posted, which is correct. When I add the addAccessFilter back 
> in with a simple expression that should match anything ".*", I get no 
> messages back at all.
>  
> Here is the dump of my subscribe key and subscribe qos
>  
> SubscribeKey=
>  <key queryType='XPATH'>
>   //key[starts-with( at oid, 'msg-')]
>  </key>
> SubscribeQos=
>  <qos>
>   <content/>
>   <multiSubscribe/>
>   <local>false</local>
>   <initialUpdate/>
>   <filter type='GnuRegexFilter'>
>    <![CDATA[.*]]>
>   </filter>
>   <history numEntries='1000' newestFirst='false'/>
>   <isSubscribe/>
>  </qos>
> Matt

Hi Matt,

if have played on command line with the clients below,
everthing works as expected here:

-------------------------------------
cd xmlBlaster

#Start server
java -jar lib/xmlBlaster.jar

#Start subscriber
java -cp lib/xmlBlaster.jar javaclients.HelloWorldSubscribe -xpath "//key[starts-with( at oid, 
'msg-')]" -filter.type GnuRegexFilter -filter.query ".*"

#Start a ".*A" filtering subscriber
java -cp lib/xmlBlaster.jar javaclients.HelloWorldSubscribe -xpath "//key[starts-with( at oid, 
'msg-')]" -filter.type GnuRegexFilter -filter.query ".*A"

#Start first publisher
java -cp lib/xmlBlaster.jar javaclients.HelloWorldPublish -numPublish 100 -oid "msg-1" -content "12A"

#Start second publisher
java -cp lib/xmlBlaster.jar javaclients.HelloWorldPublish -numPublish 100 -oid "msg-2" -content "12B"
-------------------------------------

One note: You have set "<local>false</local>", if your publisher uses
the same login connection as the subscriber the messages
are suppressed.

regards

Marcel

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