On Thu, Sep 20, 2012 at 03:37:10PM -0400, Rajith Attapattu wrote: > Given some of the recent discussions, it appears there isn't much > consensus as to what the "Messenger API" is. > For my own sanity, could someone with more knowledge on the $subject > please explain the following? > > 1. What is Messenger API ? > i.e Do we have a doc or a wiki page that documents what the API > is and more importantly what the expected behaviour is.
From my perspective, a Messenger is a high-level end-point for sending and receiving messages. It keeps you from having to worry about the underlying components of a session, a context, encoding and decoding messages. Instead, it gives you very simple APIs to start and stop communications, queue up and send messages and receive and then pull out individual messages for processing. > 2. How is it different from the "Messaging API aka Qpid API" > I'm looking for something more than the matrix given by Rafi, all > though it provides a good start to understanding it. Again, from my perspective, it reduces the complexity by, again, keeping you from having to worry about the details of connecting with a remote messaging endpoint. Something else is that it's designed from the ground up with efficiency. One specific one that comes to mind is the pn_messenger_get() API, which can reuse existing instances of pn_message_t to avoid spending time allocating memory. > 3. How are we planning to position these various API's in the future? > I agree that a lot of things are up in the air, but it's also good > to share some early ideas all though they might change in the future. My understanding is that we'll have a layer on top of Proton that will provide the existing Qpid APIs while, underneath, Proton is doing the heavy lifting. I may be wrong on some (or all) points, in which case someone please set me straight. -- Darryl L. Pierce, Sr. Software Engineer @ Red Hat, Inc. Delivering value year after year. Red Hat ranks #1 in value among software vendors. http://www.redhat.com/promo/vendor/
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