groovy - How to send and receive domain objects with rabbitMQ plugin and grails -

i've went on excellent documentation rabbitmq plugin. however, still confused few things.

scenario

my application take file upload user, various things file , accordingly set properties on domain object. of work can labor intensive using queue. envision requests being queued , consumer picking requests queue , consuming them.

questions

i want store domain object in queue. by: rabbitsend 'myqueue', colorobj. colorobjis object of domain class color however, in colorservice handlemessage(...) when fetch item queue, item not of type color. please note on rabbitmq dashboard can see items being inserted in queue, queue initiation in config.groovy fine (i using amq.direct)

• how can send , fetch domain object queue?
• from behavior i've seen far, handlemessage not need instantiated. if don't call colorservice still executes handlemessage itself. normal behavior?

below code:

controller

color colorobj = colorservice.newrequest(params, request.getfile('color.filename') if (colorobj.validate)   rabbitsend 'myqueue', colorobj ... 

service

class colorservice {   static rabbitqueue = 'myqueue'    void handlemessage(message) {     println "came in message: " + message instanceof color //this prints false   } } 

as shows in documentation, can either send string or map

why not send id of domain object:

rabbitsend 'myqueue', colorobj.id 

then, load in when message processed:

void handlemessage(message) {     println "got ${color.get( message )}" } 

or, if don't need domain object until message processed, send map of required data, , have service create domain object after processed successfully?