[openamq-dev] Threadsafe channels?

[Birju Prajapati]

Hi Mato,

On Tue, Sep 25, 2007 at 03:02:58PM +0200, Martin Lucina wrote:
> 
> Birju.Prajapati at schneidertrading.com said:
> > I hope you can help with this short one: Is a channel threadsafe? I
> > don't see anywhere in the docs that states otherwise. I.e. can multiple
> > threads simultaneously send messages through one channel?
> 
> That is the intent of the design.  However, I'm not sure which
> implementation your question is referring to.  I can't speak for the
> QPid developers, but the current OpenAMQ release only supports one
> channel (i.e. session in WireAPI) per connection.

I was talking about the WireAPI (for AMQP 0.9). This is a bit confusing for me as this statement from Section 2 of http://www.openamq.org/wireapi.html seems to contradict itself:

"AMQP is a multi-channel protocol, meaning that one network connection can carry an arbitrary number of parallel, independent virtual connections, which AMQP calls "channels". In WireAPI these are called "sessions" for compatability with other middleware APIs. NOTE: OpenAMQ supports exactly ONE session per connection."

The first sentence seems to be stating that multiple parallel 'sessions/channels' are allowed per connection, whereas the 'NOTE' seems to be stating that only one 'session/channel' is allowed per connection. Am I misinterpreting the document?
Do you mean to say that the spec allows multiple channels, but the WireAPI only allows one?

> 
> That's correct, thanks for reporting it, I'll fix it in SVN and update
> the website with the next release.

No worries, I've found the same problem in:
http://www.openamq.org/doc_wireapi.txt_flat.html

Many thanks,
Birju
 

 
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