Class: Module

Inherits:
Object show all
Defined in:
lib/crystal/support/module.rb

Instance Method Summary collapse

Instance Method Details

#cache_method_with_params_in_production(method) ⇒ Object

Dynamically enables cache in :production and disables in another environments. If no environment given uses non-cached version.



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# File 'lib/crystal/support/module.rb', line 7

def cache_method_with_params_in_production method        
  method_with_cache, method_without_cache = "#{method}_with_cache", "#{method}_without_cache"
  iv = "@#{method}_cache"
  
  raise "Method '#{method}' already defined!" if instance_methods.include?(method)
  raise "Can't cache the '#{method}' twice!" if instance_methods.include?(method_with_cache)
      
  # create cached method
  define_method method_with_cache do |*args| 
    unless results = instance_variable_get(iv)
      results = Hash.new(NotDefined)
      instance_variable_set iv, results
    end
    
    result = results[args]
              
    if result.equal? NotDefined 
      result = send als, *args
      results[args] = result
    end
  
    result
  end
      
  # listen to environment events
  crystal.after :config do |config|
    if config.production?
      alias_method method, method_with_cache
    else
      alias_method method, method_without_cache
    end
  end
  
  # by default uses non-cached version
  alias_method method, method_without_cache
end