On Thu, Jun 19, 2008 at 8:01 AM, Sanjiva Weerawarana <[EMAIL PROTECTED]> wrote:
> Amila Suriarachchi wrote: > >> >> Here there are two cases, 1. Finished sequences (from Application >> client) Here Application client has not messages to send. So it sends a >> special message >> >> 2. Non complete sequences Here Application client has messages. >> Currently Mercury requires to send a special message but can avoid this >> requirement and start with the next message. >> > > No. The whole point of *reliable* messaging is that once the application > has sent the message it can *forget about that message* and it'll somehow > get delivered (subject to constraints obviously .. best effort). The > application CANNOT be expected to tell the RM engine "dude, yeah you know > like those messages I asked you to send? yeah those ones. please do send > them out when you feel cool about it"! > > Your design requires the user to do something which is totally unnatural in > a *reliable* messaging world. I think here you are comparing WS-RM with other reliable messaging like JMS, SMTP. I don't have a broad knowledge about reliable messaging. But this is what I can see. The other transports send the message to an intermediate node before sending to the destination. But for WS-RM it persists the message at the same JVM and do a direct service invocation. In JMS case when the message goes to JMS Queue it does not matter whether client crash or not. But for WS-RM once the client crash RM source also crashed and some one has to re start that. In JMS case what happened if the JMS Queue crashed? in this case some one has to restart it and JMS Queue may recover. Here it would be easier to start it since it is dedicated to JMS messages. Here Axis2 Engine is a general purpose one. So there are some technical problems with that as well. thanks, Amila. > > > Sanjiva. > -- > Sanjiva Weerawarana, Ph.D. > Founder & Director; Lanka Software Foundation; http://www.opensource.lk/ > Founder, Chairman & CEO; WSO2, Inc.; http://www.wso2.com/ > Member; Apache Software Foundation; http://www.apache.org/ > Visiting Lecturer; University of Moratuwa; http://www.cse.mrt.ac.lk/ > > Blog: http://sanjiva.weerawarana.org/ > -- Amila Suriarachchi, WSO2 Inc.
