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From andrew.mar...@uk.bnpparibas.com
Subject Fw: AMQ-cpp problem with ExceptionListener, receive and lost connection
Date Wed, 16 Jun 2010 11:30:50 GMT
I have developed a set of interface classes for my client-server system 
that allow me to switch in either ActiveMQ or MQSeries. I have been 
testing what happens when the connection is lost to the Q mgr. I have 
arranged for the server to halt so that it is restarted from the script 
that kicks it off in the first place. I have arranged for the client to 
detect that the connection has gone away and for it to reconnect. With 
MQSeries this works. Here are some observations about what I had to do to 
get it work:

On the client side with ActiveMQ the receive behaves like it times out 
when the connection goes away. So when that happens I write a heartbeat 
message to the rqst Q. That does fail if the Q mgr is not there. I found 
that with MQSeries the receive fails with an exception. So, with MQSeries 
a heartbeat approach is not needed.  I must admit, the MQSeries behaviour 
is what I would expect. I was suprised when ActiveMQ didn't do this. Can 
anyone comment please?

On the server side I saw similar issues but I react to them differently. I 
make the server die, since the script that kicks it off will restart it. 
Eventually when the Q mgr comes back this means the server will be up and 
running ok. With MQSeries this is just fine, but with ActiveMQ the server 
just sits in the receive loop. The server cannot write heart beats 
anywhere so I cannot use that approach on the server side. I tried using 
an ExceptionListener but it seemed like it was not picking up anything. 
Using an ExceptionListener was a right pain to add, especially because 
afterwards I discovered that MQSeries does not need it (or invoke it). 
What do people do to make their AMQ-cpp servers detect that the Q mgr has 
gone away?

I originally picked ActiveMQ to make things easier to develop and test 
with. It was always going to go into production with MQSeries. It is quite 
ironic that it ha actually been easier to do the development with 
MQSeries.

Regards,

Andrew Marlow

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