Module: ClassCallbacks

Extended by:
ClassCallbacks
Included in:
ClassCallbacks
Defined in:
lib/common/class_callbacks.rb

Overview

in some class ClassCallbacks.define self, :before, :after

then to execute instance_object = SomeClass.new ClassCallbacks.execute(instance_object, :before)

before do

...

end

logic is very simple, keep all pointers to all blocks in one class, resolve and execute as needed we keep methods and ponters in different hashes to allow hot reload while development

Constant Summary collapse

@@methods = 
{}
@@pointers = 
{}

Instance Method Summary collapse

Instance Method Details

#add(klass, unique_id, action, method) ⇒ Object 



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# File 'lib/common/class_callbacks.rb', line 23

def add klass, unique_id, action, method
  key = Crypt.md5(unique_id)
  @@pointers[key] = method
  @@methods[klass.to_s] ||= {}
  @@methods[klass.to_s][action] ||= []
  @@methods[klass.to_s][action].push(key) unless @@methods[klass.to_s][action].index(key)
end

#define(klass, *args) ⇒ Object 



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# File 'lib/common/class_callbacks.rb', line 50

def define(klass, *args)
  for action in args
    klass.class_eval %[
      def #{action}(duck=nil)
      end

      def self.#{action}(proc=nil, &block)
        ClassCallbacks.add(self, caller[0], :#{action}, proc || block)
      end
    ]
  end
end

#execute(instance_object, action, object = nil) ⇒ Object 



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# File 'lib/common/class_callbacks.rb', line 31

def execute instance_object, action, object=nil
  object ? instance_object.send(action, object) : instance_object.send(action)

  # execute for self and parent
  for name in instance_object.class.ancestors.reverse.map(&:to_s)
    next if name == 'Object'

    if @@methods[name] && @@methods[name][action]
      for el in @@methods[name][action].map { |o| @@pointers[o] }
        if el.kind_of?(Symbol)
          object ? instance_object.send(el, object) : instance_object.send(el)
        else
          object ? instance_object.instance_exec(object, &el) : instance_object.instance_exec(&el)
        end
      end
    end
  end
end