Connection#poll doesnt work about stomp

[gmallard]

I believe the behavior is expected.

You have issued connect, and subscribe, but the broker has not had time (yet) to get data on the wire and have it physically available to the client. Specifically the socket is returning false to 'socket.ready?'. It means there is nothing (yet) to be received, i.e nothing in the socket's input buffers.

I understand that the 'queue already has messages on it'. But in your example, the first one is still in flight from the server to the client.

Note that this can even occur when the client and broker are resident on the same system.

I would normally use poll something like this:

while true
    message = conn.poll
    if message
        # process message
    else
        sleep x
    end
end

The point of poll is that it is asynchronous (non-blocking). If there is nothing to receive, you can go and attend to other required tasks, or sleep to wait for a message to arrive.

If you want a synchronous (blocking) receive, then ask for one:

message = conn.receive

[gmallard]

For completeness, I am going to document that 'poll' is indeed broken using JRuby. And it will remain broken until the JRuby team addresses this:

http://jira.codehaus.org/browse/JRUBY-5617

[ripienaar]

Yeah I too prefer receive, but had to play with poll and noticed the odd behavior.

Thanks for the great description of whats going on though, much appreciated. I was going to file some jruby issues but I guess there's little point :)

You can close this, thanks!