Module | Innate::StateAccessor |
In: |
lib/innate/state/accessor.rb
|
Simplify accessing Thread.current variables.
Example:
class Foo include Innate::StateAccessor state_accessor :session def calculate session[:num1] + session[:num2] end end
Foo#calculate can now be called from anywhere in your application and it will have direct access to the session in the current request/response cycle in a thread-safe way without the need to explicitly pass the session along.
Iterate over the names and yield accordingly. names are either objects responding to to_sym or hashes.
It‘s only used within this module to make the code readable.
Used below.
Combined state_writer and state_reader. initializer is a block that may be given and its result will be the new value in case the method created by state_reader was never called before and the value wasn‘t set before.
Example:
state_accessor(:session) state_accessor(:user){ session[:user] }
Reader accessor for Thread.current[key]
Example:
class Foo include Innate::StateAccessor state_reader(:session) state_reader(:random){ rand(100_000) } def calculate val1 = session[:num1] + session[:num2] + random val2 = session[:num1] + session[:num2] + random val1 == val2 # => true end end
NOTE:
If given +initializer+, there will be some performance impact since we cannot use class_eval and have to use define_method instead, we also have to check every time whether the initializer was executed already. In 1.8.x the overhead of define_method is 3x that of class_eval/def In 1.9.1 the overhead of define_method is 1.5x that of class_eval/def This may only be an issue for readers that are called a lot of times.
Writer accessor to Thread.current[key]=
Example: class Foo include Innate::StateAccessor state_writer(:result) def calculate self.result = 42 end end class Bar include Innate::StateAccessor state_reader(:result) def calculcate result * result end end Foo.new.calculate # => 42 Bar.new.calculate # => 1764