Class: Concurrent::Collection::CopyOnNotifyObserverSet Private

Inherits:
Synchronization::LockableObject
  • Object
show all
Defined in:
lib/concurrent/collection/copy_on_notify_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-read approach: observers are added and removed from a thread safe collection; every time a notification is required the internal data structure is copied to prevent concurrency issues

Instance Method Summary collapse

Constructor Details

#initialize ⇒ CopyOnNotifyObserverSet

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 CopyOnNotifyObserverSet.



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# File 'lib/concurrent/collection/copy_on_notify_observer_set.rb', line 14

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_notify_observer_set.rb', line 20

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
    @observers[observer] = func
    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_notify_observer_set.rb', line 55

def count_observers
  synchronize { @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_notify_observer_set.rb', line 39

def delete_observer(observer)
  synchronize do
    @observers.delete(observer)
    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_notify_observer_set.rb', line 47

def delete_observers
  synchronize do
    @observers.clear
    self
  end
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_notify_observer_set.rb', line 72

def notify_and_delete_observers(*args, &block)
  observers = duplicate_and_clear_observers
  notify_to(observers, *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_notify_observer_set.rb', line 62

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