Class: CelluloidIOPGListener::Examples::ListenerClientByInheritance

Inherits:
Client
  • Object
show all
Defined in:
lib/celluloid-io-pg-listener/examples/listener_client_by_inheritance.rb

Instance Attribute Summary

Attributes inherited from Client

#optional_arg

Instance Method Summary collapse

Methods inherited from Client

#insert_callback

Constructor Details

#initialize(a = nil, b = nil, bus: nil, fat: nil, **args) ⇒ ListenerClientByInheritance

When you are:

* sub-classing a class that includes the Client and defines initialize

If you

* defining a custom / overridden initialize method in the sub-class

The Client may not work.

* the initialize overrides may happen out of normal order,
  and may not work as expected.

Working Example of overridden initialize follows!



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# File 'lib/celluloid-io-pg-listener/examples/listener_client_by_inheritance.rb', line 18

def initialize(a = nil, b = nil, bus: nil, fat: nil, **args)
  # Unlike in the original class, the prepends have been usurped since this overridden method is now highest precedence.
  super(subclassed_client: true, **args)
  # The initialize overrides will be called by super, and thus you have to be careful how you pass on the arguments to super.
end

Instance Method Details

#foo_bar(channel, payload) ⇒ Object

callback_method does not accept a block parameter

Raises:

  • (RuntimeError) 


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# File 'lib/celluloid-io-pg-listener/examples/listener_client_by_inheritance.rb', line 25

def foo_bar(channel, payload)
  # <-- within the unlisten_wrapper's block if :foo_bar is the callback_method
  debug "#{self.class}##{__method__} channel: #{channel}"
  debug "#{self.class}##{__method__} payload: #{payload}"
  raise RuntimeError, "This example only works on the users_insert channel, you are notifying #{channel} with #{payload}" unless channel == "users_insert"
end