Sanjiva, The example was just meant to illustrate my point and probably there are better examples. I just wanted to trigger a discussion about the direction in which we are going. I agree with the approach outlined by Paul and I think Asankha gave some very valuable information that we need to take into account if we want to build higher level transaction support later.
My next question is what would be the recommendation to have distributed transaction support (e.g. between JMS and a database) in a Synapse stand-alone installation. Is there some lightweight Open Source transaction manager that one can use (to avoid the burden of installing a full-featured application server)? I'm thinking about something as Jencks or JOTM. Andreas On Tue, Nov 18, 2008 at 09:29, Sanjiva Weerawarana <[EMAIL PROTECTED]> wrote: > Andreas Veithen wrote: >> >> Asankha, >> >> Let me explain my concern using an example. Imagine that the use case >> is a JMS request-response proxy service and that the requirement is to >> consume the request and to produce the response in a single >> transaction (to guarantee that either there is a response or the >> request remains on the queue). Also imagine that the target endpoint >> uses HTTP. If the non blocking transport is used, then the request and >> response processing will not happen in the same thread, right? This >> means that at some point the transaction needs to be detached from the >> thread processing the request and resumed in the thread processing the >> response. Who is responsible for doing this and how would such a proxy >> definition look like in Synapse? > > Andreas, given the transaction does not flow over the HTTP connection, > what's the point of wrapping the HTTP request/response within a transaction? > There's no way to abort the tx for example. > > In effect the HTTP interaction has to occur outside the tx right? At that > point, what is the point of putting what happens after the HTTP response in > the same TX as the original one because basically you've lost the semantic > anyway. > > I'm prolly getting this wrong .. thanks for your patience in answering it! > > 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/ > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
