class Defer

Defers the initialization of an instance until a method is called.

Standard Usage:

Initialization:

instance = Defer.defer {

instance.new
instance.do_something

}

Runtime:

instance.do_another_thing # starts the initialization here, not above

Public Class Methods

defer(&block) click to toggle source

Initializes defer on a block of code

# File lib/defer/defer.rb, line 18
def self.defer(&block)
  Defer.new(&block)
end

new(&block) click to toggle source

# File lib/defer/defer.rb, line 22
def initialize(&block)
  @deferred_init = block
  @semaphore = Mutex.new
end

Public Instance Methods

get_instance() click to toggle source

Gets an instance of the object, calling the deferred method if needed

# File lib/defer/defer.rb, line 28
def get_instance
  @semaphore.synchronize do 
    if @object.nil?
      @object = @deferred_init.call
    else 
      @object
    end
 end
end

method_missing(method, *args, &block) click to toggle source

After initialization is done, defer passes the arguments through

this block to ensure that everything is completed as required

# File lib/defer/defer.rb, line 40
def method_missing(method, *args, &block)
 object = get_instance
 object.send(method, *args, &block);
end