[chef] Access node attributes in a library

[< >]

Can we access node attributes in a library? In the sample below, I get an 
error

NoMethodError: undefined method `[]' for nil:NilClass on the stomp_server
variable assignment line

<code>
class Chef::Recipe::LOG
   def self.logEvent(s)
        stomp_server = @node[:stomp_server]
        Chef::Log.info ("#{stomp_server}");
                
   end
end
</code>