Re: Can dialogs be used safely?

Luis,

Please cvs update. A month old is a bit dated. CVS detals are on 
jain-sip.dev.java.net


Its not a thread pool issue but a question of whether there are 
re-entrancy problems with the SIPDialog data structure. I am wondering 
if I should put a semaphore on that one as I have done with the 
SIPTransaction. I dont like nested semaphores however ( can cause 
deadlock if  one is not careful about lock ordering). I will give this a 
try and see if your problem persists if you are willing to work with me 
on resolving this.

Regards
Ranga


 Luis Alberto Teixeira wrote:

>Hi Ranga,
>
>Well, I could not find any thread pool issue. But the only suspicious
>thing I am considering so far is the fact that to be able to run my
>service I am forcing the AUTOMATIC_DIALOG_SUPPORT property to be set to
>on at the SIP RA. In this case I will modify my code in order to verify
>if there is a dialog, creating one if it doesn't exist. Relative to the
>nist-sip version I am using, it is at most one month old..
>
>Thanks.
>
>Luis
>
>-----Original Message-----
>From: M. Rangnathan [mailto:[email protected]] 
>Sent: quarta-feira, 19 de Abril de 2006 19:49
>To: Luis Alberto Teixeira
>Cc: [email protected]
>Subject: Re: [nist-sip] Can dialogs be used safely?
>
>Luis,
>
>I do hope you are using the current version from the cvs repository. 
>What are these errors? Dialogs are certainly not deprecated.  You can do
>
>without dialogs in Jain-sip-1.2 but before you give using the dialog 
>implementation I'd like to work with you on getting things done right. 
>If you are having an issue at load, perhaps there are synchronization 
>problems with dialogs. Have you experienced problems with a thread pool 
>of size of 1
>
>Ranga
>
>Luis Alberto Teixeira wrote:
>
>  
>
>>Hi all,
>>
>> 
>>
>>I have been working on a B2BUA service that in many aspects relies on 
>>the Dialog implementation offered by the nist-sip stack. During 
>>development the service have been softly tested through the different
>>
>>use cases and the results were successfull. But after a series of 
>>tests under moderate load conditions, errors and unexpected behavior 
>>became visible. Without being able to point out a concrete failure in
>>    
>>
>the
>  
>
>>service, and given the exceptions coming from the nist-sip stack and 
>>the SIP RA (the service is executed on top of Mobicents application 
>>server), we start questioning how much is it a good idea to keep
>>    
>>
>relying
>  
>
>>on the dialog objects provided by nist-sip instead of using other 
>>solutions (whenever adequate for a BUBUA kind of service). Are the 
>>dialogs safe to use or is it a deprecated choice for a reliable User 
>>Agent.
>>
>> 
>>
>>Thanks.
>>
>> 
>>
>> 
>>
>>Luis Teixeira
>>
>> 
>>
>> 
>>
>>-----------------------------------------------------------------------
>>    
>>
>-
>  
>
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>>[email protected]
>>http://www-x.antd.nist.gov/mailman/listinfo/nist-sip
>> 
>>
>>    
>>
>
>
>  
>


-- 
M. Ranganathan 

Advanced Networking Technologies Division,
National Institute of Standards and Technology (NIST),
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tel:301 975 3664 , fax:301 590 0932 http://w3.antd.nist.gov/
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