class Concurrent::Collection::CopyOnNotifyObserverSet
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
@api private
Public Class Methods
new()
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Calls superclass method
# File lib/concurrent-ruby/concurrent/collection/copy_on_notify_observer_set.rb, line 14 def initialize super() synchronize { ns_initialize } end
Public Instance Methods
add_observer(observer = nil, func = :update, &block)
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@!macro observable_add_observer
# File lib/concurrent-ruby/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()
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@!macro observable_count_observers
# File lib/concurrent-ruby/concurrent/collection/copy_on_notify_observer_set.rb, line 55 def count_observers synchronize { @observers.count } end
delete_observer(observer)
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@!macro observable_delete_observer
# File lib/concurrent-ruby/concurrent/collection/copy_on_notify_observer_set.rb, line 39 def delete_observer(observer) synchronize do @observers.delete(observer) observer end end
delete_observers()
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@!macro observable_delete_observers
# File lib/concurrent-ruby/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)
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Notifies all registered observers with optional args and deletes them.
@param [Object] args arguments to be passed to each observer @return [CopyOnWriteObserverSet] self
# File lib/concurrent-ruby/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)
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Notifies all registered observers with optional args @param [Object] args arguments to be passed to each observer @return [CopyOnWriteObserverSet] self
# File lib/concurrent-ruby/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
Protected Instance Methods
ns_initialize()
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# File lib/concurrent-ruby/concurrent/collection/copy_on_notify_observer_set.rb, line 80 def ns_initialize @observers = {} end
Private Instance Methods
duplicate_and_clear_observers()
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# File lib/concurrent-ruby/concurrent/collection/copy_on_notify_observer_set.rb, line 86 def duplicate_and_clear_observers synchronize do observers = @observers.dup @observers.clear observers end end
duplicate_observers()
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# File lib/concurrent-ruby/concurrent/collection/copy_on_notify_observer_set.rb, line 94 def duplicate_observers synchronize { @observers.dup } end
notify_to(observers, *args) { || ... }
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# File lib/concurrent-ruby/concurrent/collection/copy_on_notify_observer_set.rb, line 98 def notify_to(observers, *args) raise ArgumentError.new('cannot give arguments and a block') if block_given? && !args.empty? observers.each do |observer, function| args = yield if block_given? observer.send(function, *args) end end