Class: Module

Inherits:
Object show all
Defined in:
lib/amp/dependencies/zip/stdrubyext.rb,
lib/amp/support/support.rb

Instance Method Summary collapse

Instance Method Details

#forward_message(forwarder, *messagesToForward) ⇒ Object 



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# File 'lib/amp/dependencies/zip/stdrubyext.rb', line 99

def forward_message(forwarder, *messagesToForward)
  methodDefs = messagesToForward.map { 
    |msg| 
    "def #{msg}; #{forwarder}(:#{msg}); end"
  }
  module_eval(methodDefs.join("\n"))
end

#memoize_method(meth_name, module_function_please = false) ⇒ Object

Makes an instance or module method memoized. Works by aliasing the old method and creating a new one in its place.

Parameters:

  • meth_name (Symbol, #to_sym) —

    the name of the method to memoize

  • module_function_please (Boolean) (defaults to: false) —

    should we call module_function on the aliased method? necessary if you are memoizing a module’s function made available as a singleton method via module_function.

Returns:

  • the module itself.



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# File 'lib/amp/support/support.rb', line 161

def memoize_method(meth_name, module_function_please = false)
  meth_name = meth_name.to_sym
  aliased_meth = "__memo_#{meth_name}".to_sym
  # alias to a new method
  alias_method aliased_meth, meth_name
  # module_function the newly aliased method if necessary
  if module_function_please && self.class == Module
    module_function aliased_meth
  end
  # incase it doesn't exist yet
  @__memo_cache ||= {}
  # our new method! Replacing the old one.
  define_method meth_name do |*args|
    # we store the memoized data with an i-var.
    @__memo_cache[meth_name] ||= {}
    cache = @__memo_cache[meth_name]
    
    # if we have the cached value, return it
    result = cache[args]
    return result if result
    # cache miss. find the value
    result = send(aliased_meth, *args)
    cache[args] = result
    result
  end
  self
end