Re: Asynchonrous and synchronous messages on same channel

Hi,



probably this e-mail don't contribute with the question, but I have a doubt 
and this topic motivate me to write here.



I don't know how is the implementation (approach) to send synchronous 
messages on JGroups, but this property (synchrony) is not dependable of the 
environment (physical devices)?



My feeling is that you cannot implement synchronous channels if the physical 
channel is not guarantee timing bounds. Then, JGroups implementations in 
unpredictable networks never could be provide synchronous communication.

Maybe you should need clock synchronization, or some kind of information 
capable to represent the time notion in the distributed system.



Well, repeating, I don't know what is guaranteed and what are the 
assumptions in JGroups implementation of synchronous messages, but I ask if 
this is not dependable of the network used, for example?



Thank you,

Odorico Mendizabal





----- Original Message ----- 
From: "Tim Fox" <tim.fox@xxxxxxxxx>
To: <javagroups-users@xxxxxxxxxxxxxxxxxxxxx>
Cc: "Bela Ban" <belaban@xxxxxxxxx>
Sent: Monday, September 04, 2006 10:39 PM
Subject: Re: [javagroups-users] Asynchonrous and synchronous messages on 
same channel


>
>
> Bela Ban wrote:
>
>> Note that you can use the Dispatcher to do both anyway: castMessage()
>> has a mode parameter, which can get GroupRequest.GET_ALL (block for all
>> replies, minus the suspected ones) or GroupRequest.GET_NONE (wait for no
>> replies), which is essentially asynchronous.
>>
>
> Ok, that's interesting.
>
> Are there any performance implications of doing async sending this way
> as opposed to a straightforward send() ?
>
> The use case I'm thinking of here is casting of unreliable messages to
> distributed topic peers in JBM, so we can expect a lot of traffic.
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job 
> easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
> _______________________________________________
> javagroups-users mailing list
> javagroups-users@xxxxxxxxxxxxxxxxxxxxx
> https://lists.sourceforge.net/lists/listinfo/javagroups-users
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.405 / Virus Database: 268.11.7/437 - Release Date: 4/9/2006
>
> 


                
_______________________________________________________ 
O Yahoo! está de cara nova. Venha conferir! 
http://br.yahoo.com


-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642