Class: Keycard::ReloadableProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/keycard/reloadable_proxy.rb

Overview

A proxy for class methods, as for authentication methods on User/Account models. This is useful primarily during development mode, where binding a finder into a Verfication factory can break because of code reloading.

For example, something like this would fail across requests where the User model is saved (in development): ‘AuthToken.bind(User.public_method(:authenticate_by_auth_token))`.

Instead, you can bind to a class method with a proxy that will catch the error from Rails thrown when using a stale reference, replace the target method, and retry the call transparently.

Examples:

callable = ReloadableProxy.new(:User, :authenticate_by_auth_token)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(classname, methodname) ⇒ ReloadableProxy

Returns a new instance of ReloadableProxy.



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# File 'lib/keycard/reloadable_proxy.rb', line 21

def initialize(classname, methodname)
  @classname = classname
  @methodname = methodname
  lookup
end

Instance Attribute Details

#classname ⇒ Object (readonly)

Returns the value of attribute classname.



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# File 'lib/keycard/reloadable_proxy.rb', line 19

def classname
  @classname
end

#methodname ⇒ Object (readonly)

Returns the value of attribute methodname.



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# File 'lib/keycard/reloadable_proxy.rb', line 19

def methodname
  @methodname
end

#target ⇒ Object (readonly)

Returns the value of attribute target.



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# File 'lib/keycard/reloadable_proxy.rb', line 19

def target
  @target
end

Instance Method Details

#call(*args) ⇒ Object

Call the proxied class method, looking it up again if the class has been reloaded (as signified byt he ArgumentError Rails raises).



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# File 'lib/keycard/reloadable_proxy.rb', line 29

def call(*args)
  target.call(*args)
rescue ArgumentError
  lookup
  target.call(*args)
end

#lookup ⇒ Object 



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# File 'lib/keycard/reloadable_proxy.rb', line 36

def lookup
  @target = Object.const_get(classname).method(methodname)
end