lib/device.rb in narou-1.0.2 vs lib/device.rb in narou-1.1.0.rc1

@@ -23,9 +23,17 @@
 
   def self.exists?(device)
     DEVICES.include?(device.downcase)
   end
 
+  def self.create(device_name)
+    @@device_cache ||= {}
+    name = device_name.downcase
+    return @@device_cache[name] ||= new(name)
+  end
+
+  private_class_method :new
+
   def initialize(device_name)
     unless Device.exists?(device_name)
       raise UnknownDevice, "#{device_name} は存在しません"
     end
     @device = DEVICES[device_name.downcase]