Puppet users - Mar 2014 - Problem with if resource ordering

I have a problem with if statements, they execute first of all, for example 
the next code inside a class that is placed the last resource on node 
definition:

   exec { 'rabbitmqctl stop_app':
      }
      if $rabbitmq_version == '2.8.7-1' {
          exec { 'rabbitmqctl reset':
          }

          exec { "rabbitmqctl cluster rabbit@$cluster":
          }
      }
      elsif $rabbitmq_version == '3.2.2-1' {
          exec { "rabbitmqctl join_cluster rabbit@$cluster":
          }
      }
      exec { 'rabbitmqctl start_app':
      }

The commands inside the if or elsif conditions are executed first, but i 
don't want this. I think to call another subclass inside the if/elsif 
conditions.
What do you think? Is there 

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