Class: Harbor::Hooks::Chain

Inherits:
Object
  • Object
show all
Defined in:
lib/harbor/hooks.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(target, method_name) ⇒ Chain

Returns a new instance of Chain.



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# File 'lib/harbor/hooks.rb', line 37

def initialize(target, method_name)
  @target = target
  @method_name = method_name
  @before = []
  @after = []

  bind! if target.instance_methods.include?(method_name.to_s)
end

Class Method Details

.bind!(target, method_name) ⇒ Object 



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# File 'lib/harbor/hooks.rb', line 72

def self.bind!(target, method_name)
  target.send(:alias_method, "__hooked_#{method_name}", method_name)

  target.send(:class_eval, "    instance_variable_set(:@__harbor_binding_method, true)\n    def \#{method_name}(*args, &block)\n      self.class.hooks[\#{method_name.inspect}].call(self, args, block)\n    end\n    remove_instance_variable(:@__harbor_binding_method)\n  EOS\nend\n")

Instance Method Details

#after(block) ⇒ Object 



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# File 'lib/harbor/hooks.rb', line 50

def after(block)
  @after << block
end

#before(block) ⇒ Object 



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# File 'lib/harbor/hooks.rb', line 46

def before(block)
  @before << block
end

#bind! ⇒ Object 



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# File 'lib/harbor/hooks.rb', line 84

def bind!
  self.class.bind!(@target, @method_name)
end

#call(instance, args, blk = nil) ⇒ Object 



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# File 'lib/harbor/hooks.rb', line 54

def call(instance, args, blk = nil)
  result = nil

  catch(:halt) do
    @before.each do |block|
      block.call instance
    end

    result = instance.send("__hooked_#{@method_name}", *args, &blk)

    @after.each do |block|
      block.call instance
    end

    result
  end
end