Class: Concurrent::Collection::CopyOnWriteObserverSet Private

Inherits:
Synchronization::LockableObject
  • Object
show all
Defined in:
lib/concurrent/collection/copy_on_write_observer_set.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

A thread safe observer set implemented using copy-on-write approach: every time an observer is added or removed the whole internal data structure is duplicated and replaced with a new one.

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CopyOnWriteObserverSet

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of CopyOnWriteObserverSet.



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# File 'lib/concurrent/collection/copy_on_write_observer_set.rb', line 13

def initialize
  super()
  synchronize { ns_initialize }
end

Instance Method Details

#add_observer(observer = nil, func = :update, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Adds an observer to this set. If a block is passed, the observer will be created by this method and no other params should be passed.

Parameters:

  • observer (Object) (defaults to: nil) —

    the observer to add

  • func (Symbol) (defaults to: :update) —

    the function to call on the observer during notification. Default is :update

Returns:

  • (Object) —

    the added observer



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# File 'lib/concurrent/collection/copy_on_write_observer_set.rb', line 19

def add_observer(observer = nil, func = :update, &block)
  if observer.nil? && block.nil?
    raise ArgumentError, 'should pass observer as a first argument or block'
  elsif observer && block
    raise ArgumentError.new('cannot provide both an observer and a block')
  end

  if block
    observer = block
    func = :call
  end

  synchronize do
    new_observers = @observers.dup
    new_observers[observer] = func
    @observers = new_observers
    observer
  end
end

#count_observers ⇒ Integer

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Return the number of observers associated with this object.

Returns:

  • (Integer) —

    the observers count



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# File 'lib/concurrent/collection/copy_on_write_observer_set.rb', line 56

def count_observers
  observers.count
end

#delete_observer(observer) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Remove observer as an observer on this object so that it will no longer receive notifications.

Parameters:

  • observer (Object) —

    the observer to remove

Returns:

  • (Object) —

    the deleted observer



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# File 'lib/concurrent/collection/copy_on_write_observer_set.rb', line 40

def delete_observer(observer)
  synchronize do
    new_observers = @observers.dup
    new_observers.delete(observer)
    @observers = new_observers
    observer
  end
end

#delete_observers ⇒ Observable

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Remove all observers associated with this object.

Returns:

  • (Observable) —

    self



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# File 'lib/concurrent/collection/copy_on_write_observer_set.rb', line 50

def delete_observers
  self.observers = {}
  self
end

#notify_and_delete_observers(*args, &block) ⇒ CopyOnWriteObserverSet

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Notifies all registered observers with optional args and deletes them.

Parameters:

  • args (Object) —

    arguments to be passed to each observer

Returns:



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# File 'lib/concurrent/collection/copy_on_write_observer_set.rb', line 72

def notify_and_delete_observers(*args, &block)
  old = clear_observers_and_return_old
  notify_to(old, *args, &block)
  self
end

#notify_observers(*args, &block) ⇒ CopyOnWriteObserverSet

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Notifies all registered observers with optional args

Parameters:

  • args (Object) —

    arguments to be passed to each observer

Returns:



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# File 'lib/concurrent/collection/copy_on_write_observer_set.rb', line 63

def notify_observers(*args, &block)
  notify_to(observers, *args, &block)
  self
end