[rabbitmq-discuss] RabbitMQ C++ program for TTL implementation

Tim Watson tim at rabbitmq.com
Mon Jul 2 11:52:03 BST 2012

On 07/02/2012 11:15 AM, Maurya M wrote:
> Hi,
>  I am using the example from RabbitMQ website - 
> http://www.rabbitmq.com/devtools.html - amqpcpp 
> <https://github.com/akalend/amqpcpp> a C++ message library for RabbitMQ.
> I have a need to implement the Time-To-Live feature wherein my 
> Publisher is in Java and Consumer in C++.
> I am able to declare the queue with "x-message-ttl" in my Java 
> Publisher but my C++ consume also needs to declare the queue with this 
> same "x-message-ttl"? Is my understanding correct? And how can this be 
> targeted using the amqpcpp - C++ library. Has anyone of the members 
> come across similar requirement and cracked this one.

Well, looking at the constructor and declare handling code for 
AMQPExchange in 
https://github.com/akalend/amqpcpp/blob/master/src/AMQPExchange.cpp, it 
doesn't look like this is supported. Instead of initialising the 
arguments which are passed to the underlying call to 
amqp_exchange_declare (in rabbitmq-c, which amqpcpp is ostensibly based 
on), the code sets the arguments to empty/null.

If you want to support proper declare semantics then, you'll either need 
to patch amqpcpp, or defer to using rabbitmq-c directly.

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