Module: Orientdb4r::Aop2::ClassMethods2

Defined in:
lib/orientdb4r/utils.rb

Instance Method Summary collapse

Instance Method Details

#add_hook(type, original_method, *hooks) ⇒ Object

!!



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# File 'lib/orientdb4r/utils.rb', line 137

def add_hook(type, original_method, *hooks) #!!
  Array(original_method).each do |method|
    store_hook(type, method, *hooks)
  end
end

#after(original_method, *hooks) ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 129

def after(original_method, *hooks)
  add_hook(:after, original_method, *hooks)
end

#around(original_method, *hooks) ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 132

def around(original_method, *hooks)
  add_hook(:around, original_method, *hooks)
end

#before(original_method, *hooks) ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 126

def before(original_method, *hooks)
  add_hook(:before, original_method, *hooks)
end

#init_aop_extension ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 101

def init_aop_extension
  @hooks = {}
  [:before, :after, :around].each { |where| @hooks[where] = Hash.new { |hash, key| hash[key] = [] }}
  # will be like this:
  # {:before=>{:disconnect=>[:assert_connected], :query=>[:assert_connected], :command=>[:assert_connected]}, :after=>{}, :around=>{}}
  class << self
    attr_reader :hooks
  end
  @@redefining = false # flag whether the process of method redefining is running
end

#invoke_arround_hooks(obj, method_name, hooks, &block) ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 187

def invoke_arround_hooks(obj, method_name, hooks, &block)
  hook = hooks.slice! 0
  return block.call if hook.nil? # call original method if no more hook

  # invoke the hook with lambda containing recursion
  obj.send(hook.to_sym) { invoke_arround_hooks(obj, method_name, hooks, &block); }
end

#invoke_hooks(obj, hook_type, method_name) ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 184

def invoke_hooks(obj, hook_type, method_name)
  hooks[hook_type][method_name.to_sym].each { |hook| obj.send hook }
end

#is_hooked?(method) ⇒ Boolean

—————————————————————– Helpers

Returns:

  • (Boolean) 


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# File 'lib/orientdb4r/utils.rb', line 119

def is_hooked?(method)
  # look into array of keys (method names) in 2nd level hashs (see above)
  hooks.values.map(&:keys).flatten.uniq.include? method
end

#method_added(method) ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 111

def method_added(method)
  unless @@redefining # avoid recursion
    redefine_method(method) if is_hooked?(method)
  end
end

#redefine_method(orig_method) ⇒ Object 



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# File 'lib/orientdb4r/utils.rb', line 146

def redefine_method(orig_method)
  @@redefining = true

  arity = instance_method(orig_method.to_sym).arity
  params = ''
  fixed_cnt = arity.abs
  fixed_cnt -= 1 if arity < 0
  # build up a list of params
  1.upto(fixed_cnt).each {|x| params << "p#{x},"}
  params << "*argv" if arity < 0
  params.gsub!(/,$/, '') # remove last ','

  alias_method "#{orig_method}_aop2_orig".to_sym, orig_method.to_sym

  class_eval <<-FILTER,__FILE__,__LINE__ + 1
    def #{orig_method}(#{params})
      self.aop_context = { :method => '#{orig_method}', :class => self.class }
      begin
        self.class.invoke_hooks(self, :before, :#{orig_method})
        rslt = self.class.invoke_arround_hooks(self, :#{orig_method}, self.class.hooks[:around][:#{orig_method}].clone) {
          #{orig_method}_aop2_orig(#{params})
        }
        self.class.invoke_hooks(self, :after, :#{orig_method})
#            rescue Exception => e
#              # TODO use logging
#              $stderr.puts '' << e.class.name << ': ' << e.message
#              $stderr.puts e.backtrace.inspect
#              raise e
      ensure
        self.aop_context = nil
      end
      rslt
    end
  FILTER

  @@redefining = false
end

#store_hook(type, method_name, *hook_methods) ⇒ Object

!!



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# File 'lib/orientdb4r/utils.rb', line 142

def store_hook(type, method_name, *hook_methods) #!!
  hooks[type.to_sym][method_name.to_sym] += hook_methods.flatten.map(&:to_sym)
end