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From Matthew Karlsen <MKarl...@idbs.com>
Subject Reactor Heartbeat [was: RE: Rapid generation of IOExceptions on Proton-J client recv() when HornetQ stopped/becomes unavailable]
Date Wed, 06 Apr 2016 09:20:50 GMT
Hello All,

After being directed towards the Proton-J reactor (away from the messenger), I have been experimenting
with reactor. I modified the supplied reactor examples to send/recv to/from a queue on HornetQ
fairly quickly.

However, I appear to be having less success implementing a heartbeat/keep-alive (HornetQ 2.4.0
will disconnect after a one minute default if it does not receive data from the client). 

I have scheduled a regular event using [ e.getReactor().schedule(10000, this); ] with a view
to implementing a heartbeat. I then override onTimerTask() and call tick() or send an empty
frame within onTimerTask() then re-schedule another call of onTimerTask() -- I have tried
several permutations. 

However, whether I use tick(), or send an empty frame, it does not seem to maintain the connection.

I was wondering:
1) Are there any better approaches?
2) What is the "correct" approach/location for using tick()?

Thank you & regards,

-----Original Message-----
From: Robbie Gemmell [mailto:robbie.gemmell@gmail.com] 
Sent: 18 March 2016 17:59
To: users@qpid.apache.org
Subject: Re: Rapid generation of IOExceptions on Proton-J client recv() when HornetQ stopped/becomes

On 18 March 2016 at 12:15, Matthew Karlsen <MKarlsen@idbs.com> wrote:
> Hello All,
> We have a queue running in HornetQ 2.4.0 (embedded within Wildfly), with a Proton-J 0.12.0
client periodically connecting to this queue.
> If HornetQ stops or becomes unavailable when the Proton-J client is running, the Proton-J
client continually generates exceptions similar to that below (very rapidly).
> The issue is that the IOException generated exception is handled in 
> MessengerImpl's processActive() by generating an "Error processing connection" message
in the logs, rather than recv() throwing an exception and hence the higher level program logic
is unable to react to the problem.
> Is this a bug or am I missing something important?
> Thank you,
> Matthew
> java.io.IOException: An existing connection was forcibly closed by the remote host
>         at sun.nio.ch.SocketDispatcher.read0(Native Method)
>         at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43)
>         at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
>         at sun.nio.ch.IOUtil.read(IOUtil.java:197)
>         at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
>         at org.apache.qpid.proton.driver.impl.ConnectorImpl.read(ConnectorImpl.java:129)
>         at org.apache.qpid.proton.driver.impl.ConnectorImpl.process(ConnectorImpl.java:94)
>         at org.apache.qpid.proton.messenger.impl.MessengerImpl.processActive(MessengerImpl.java:738)
>         at org.apache.qpid.proton.messenger.impl.MessengerImpl.waitUntil(MessengerImpl.java:895)
>         at org.apache.qpid.proton.messenger.impl.MessengerImpl.waitUntil(MessengerImpl.java:844)
>         at org.apache.qpid.proton.messenger.impl.MessengerImpl.recv(MessengerImpl.java:446)
>         at org.apache.qpid.proton.messenger.impl.MessengerImpl.recv(MessengerImpl.java:451)
>         ...
>         at java.lang.Thread.run(Thread.java:745)
> ---------------------------------------------------------------------
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Hi Matthew,

It certainly doesnt seem desirable, I'd guess its a bug, though someone actually familiar
with Messenger could certainly correct me on that.

Messenger isn't widely used on the proton-j side, and in general Messenger isn't getting much
developer attention these days (arguably never did in proton-j, which is mostly still used
as an pure protocol engine as intended at the outset) since folks are concentrated more on
newer reactive APIs.

Proton-J is a bit behind the curve in terms of the higher level reactive work being/already
done in some of the other lanaguages (something I'll be looking to get to), but there was
a Java port done of the 'reactor' that exists in proton-c and some of its bindings. I'm not
particularly familiar with it either, or how it would handle this situation, but it may be
worth you looking at as alternative to Messenger. You can see some example of it in the examples/java/reactor
dir, e.g. the Send class (the Recv class in this case is actually a server/listener that accepts
incoming connections, such as those made by Send).


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