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Class: ActiveSupport::Reloader

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ExecutionWrapper, DescendantsTracker
Instance Chain:
self, ExecutionWrapper, Callbacks
Inherits: ActiveSupport::ExecutionWrapper
Defined in: activesupport/lib/active_support/reloader.rb

Overview

This class defines several callbacks:

to_prepare -- Run once at application startup, and also from
{to_run}.

to_run -- Run before a work run that is reloading. If
{reload_classes_only_on_change} is true (the default), the class
unload will have already occurred.

to_complete -- Run after a work run that has reloaded. If
{reload_classes_only_on_change} is false, the class unload will
have occurred after the work run, but before this callback.

before_class_unload -- Run immediately before the classes are
unloaded.

after_class_unload -- Run immediately after the classes are
unloaded.

Constant Summary

Callbacks - Included

CALLBACK_FILTER_TYPES

ExecutionWrapper - Inherited

Null

Class Attribute Summary

ExecutionWrapper - Inherited

.__callbacks, .active?

Class Method Summary

ExecutionWrapper - Inherited

.register_hook

Register an object to be invoked during both the run and complete steps.
.run!

Run this execution.
.to_complete, .to_run,
.wrap

Perform the work in the supplied block as an execution.
.active_key, .error_reporter, .perform

DescendantsTracker - Inherited

descendants, subclasses, clear, disable_clear!, reject!

Instance Attribute Summary

ExecutionWrapper - Inherited

#__callbacks

Instance Method Summary

ExecutionWrapper - Inherited

#complete!

Complete this in-flight execution.
#hook_state, #complete, #run, #run!

Callbacks - Included

#run_callbacks

Runs the callbacks for the given event.
#halted_callback_hook

A hook invoked every time a before callback is halted.

Constructor Details

.new ⇒ Reloader

[ GitHub ] 

  


# File 'activesupport/lib/active_support/reloader.rb', line 99



def initialize
  super
  @locked = false
end


  







Class Attribute Details



  

    .check   (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 85



class_attribute :check, default: lambda { false }


  








  

    .check?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 85



class_attribute :check, default: lambda { false }


  








  

    .executor   (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 84



class_attribute :executor, default: Executor


  








  

    .executor?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 84



class_attribute :executor, default: Executor


  







Class Method Details



  

    .after_class_unload(*args, &block)  
  



  

    

Registers a callback that will run immediately after the classes are unloaded.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 44



def self.after_class_unload(*args, &block)
  set_callback(:class_unload, :after, *args, &block)
end


  








  

    .before_class_unload(*args, &block)  
  



  

    

Registers a callback that will run immediately before the classes are unloaded.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 39



def self.before_class_unload(*args, &block)
  set_callback(:class_unload, *args, &block)
end


  








  

    .check!  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 87



def self.check! # :nodoc:
  @should_reload ||= check.call
end


  








  

    .prepare!  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 95



def self.prepare! # :nodoc:
  new.run_callbacks(:prepare)
end


  








  

    .reload!  
  



  

    

Initiate a manual reload


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 51



def self.reload!
  executor.wrap do
    new.tap do |instance|
      instance.run!
    ensure
      instance.complete!
    end
  end
  prepare!
end


  








  

    .reloaded!  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 91



def self.reloaded! # :nodoc:
  @should_reload = false
end


  








  

    .run!(reset: false)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 62



def self.run!(reset: false) # :nodoc:
  if check!
    super
  else
    Null
  end
end


  








  

    .to_prepare(*args, &block)  
  



  

    

Registers a callback that will run once at application startup and every time the code is reloaded.


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 34



def self.to_prepare(*args, &block)
  set_callback(:prepare, *args, &block)
end


  








  

    .wrap(**kwargs)  
  



  

    

Run the supplied block as a work unit, reloading code as needed


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 71



def self.wrap(**kwargs)
  return yield if active?

  executor.wrap(**kwargs) do
    instance = run!
    begin
      yield
    ensure
      instance.complete!
    end
  end
end


  







Instance Attribute Details



  

    #check   (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 85



class_attribute :check, default: lambda { false }


  








  

    #check?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 85



class_attribute :check, default: lambda { false }


  








  

    #executor   (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 84



class_attribute :executor, default: Executor


  








  

    #executor?  ⇒ Boolean  (rw)
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 84



class_attribute :executor, default: Executor


  







Instance Method Details



  

    #class_unload!(&block)  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 126



def class_unload!(&block) # :nodoc:
  require_unload_lock!
  run_callbacks(:class_unload, &block)
end


  








  

    #complete!  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 131



def complete! # :nodoc:
  super
  self.class.reloaded!
ensure
  release_unload_lock!
end


  








  

    #release_unload_lock!  
  



  

    

Release the unload lock if it has been previously obtained


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 114



def release_unload_lock!
  if @locked
    @locked = false
    ActiveSupport::Dependencies.interlock.done_unloading
  end
end


  








  

    #require_unload_lock!  
  



  

    

Acquire the Dependencies::Interlock unload lock, ensuring it will be released automatically


  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 106



def require_unload_lock!
  unless @locked
    ActiveSupport::Dependencies.interlock.start_unloading
    @locked = true
  end
end


  








  

    #run!  
  

  

    This method is for internal use only.
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/reloader.rb', line 121



def run! # :nodoc:
  super
  release_unload_lock!
end