Class: Unparser::Adamantium::Memory

Inherits:
Object
  • Object
show all
Defined in:
lib/unparser/adamantium.rb

Overview

Storage for memoized methods

Instance Method Summary collapse

Constructor Details

#initialize(values) ⇒ undefined

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Initialize the memory storage for memoized methods



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# File 'lib/unparser/adamantium.rb', line 46

def initialize(values)
  @values  = values
  @monitor = Monitor.new
  freeze
end

Instance Method Details

#fetch(name) ⇒ Object

Fetch the value from memory, or evaluate if it does not exist

Parameters:

  • name (Symbol)

Yield Returns:

  • (Object) —

    the value to memoize



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# File 'lib/unparser/adamantium.rb', line 60

def fetch(name)
  @values.fetch(name) do      # check for the key
    @monitor.synchronize do   # acquire a lock if the key is not found
      @values.fetch(name) do  # recheck under lock
        @values[name] = yield # set the value
      end
    end
  end
end