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Diffstat (limited to 'activemodel/lib/active_model/observer_array.rb')
| -rw-r--r-- | activemodel/lib/active_model/observer_array.rb | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/activemodel/lib/active_model/observer_array.rb b/activemodel/lib/active_model/observer_array.rb deleted file mode 100644 index 77bc0f71e3..0000000000 --- a/activemodel/lib/active_model/observer_array.rb +++ /dev/null @@ -1,152 +0,0 @@ -require 'set' - -module ActiveModel - # Stores the enabled/disabled state of individual observers for - # a particular model class. - class ObserverArray < Array - attr_reader :model_class - def initialize(model_class, *args) #:nodoc: - @model_class = model_class - super(*args) - end - - # Returns +true+ if the given observer is disabled for the model class, - # +false+ otherwise. - def disabled_for?(observer) #:nodoc: - disabled_observers.include?(observer.class) - end - - # Disables one or more observers. This supports multiple forms: - # - # ORM.observers.disable :all - # # => disables all observers for all models subclassed from - # # an ORM base class that includes ActiveModel::Observing - # # e.g. ActiveRecord::Base - # - # ORM.observers.disable :user_observer - # # => disables the UserObserver - # - # User.observers.disable AuditTrail - # # => disables the AuditTrail observer for User notifications. - # # Other models will still notify the AuditTrail observer. - # - # ORM.observers.disable :observer_1, :observer_2 - # # => disables Observer1 and Observer2 for all models. - # - # User.observers.disable :all do - # # all user observers are disabled for - # # just the duration of the block - # end - def disable(*observers, &block) - set_enablement(false, observers, &block) - end - - # Enables one or more observers. This supports multiple forms: - # - # ORM.observers.enable :all - # # => enables all observers for all models subclassed from - # # an ORM base class that includes ActiveModel::Observing - # # e.g. ActiveRecord::Base - # - # ORM.observers.enable :user_observer - # # => enables the UserObserver - # - # User.observers.enable AuditTrail - # # => enables the AuditTrail observer for User notifications. - # # Other models will not be affected (i.e. they will not - # # trigger notifications to AuditTrail if previously disabled) - # - # ORM.observers.enable :observer_1, :observer_2 - # # => enables Observer1 and Observer2 for all models. - # - # User.observers.enable :all do - # # all user observers are enabled for - # # just the duration of the block - # end - # - # Note: all observers are enabled by default. This method is only - # useful when you have previously disabled one or more observers. - def enable(*observers, &block) - set_enablement(true, observers, &block) - end - - protected - - def disabled_observers #:nodoc: - @disabled_observers ||= Set.new - end - - def observer_class_for(observer) #:nodoc: - return observer if observer.is_a?(Class) - - if observer.respond_to?(:to_sym) # string/symbol - observer.to_s.camelize.constantize - else - raise ArgumentError, "#{observer} was not a class or a " + - "lowercase, underscored class name as expected." - end - end - - def start_transaction #:nodoc: - disabled_observer_stack.push(disabled_observers.dup) - each_subclass_array do |array| - array.start_transaction - end - end - - def disabled_observer_stack #:nodoc: - @disabled_observer_stack ||= [] - end - - def end_transaction #:nodoc: - @disabled_observers = disabled_observer_stack.pop - each_subclass_array do |array| - array.end_transaction - end - end - - def transaction #:nodoc: - start_transaction - - begin - yield - ensure - end_transaction - end - end - - def each_subclass_array #:nodoc: - model_class.descendants.each do |subclass| - yield subclass.observers - end - end - - def set_enablement(enabled, observers) #:nodoc: - if block_given? - transaction do - set_enablement(enabled, observers) - yield - end - else - observers = ActiveModel::Observer.descendants if observers == [:all] - observers.each do |obs| - klass = observer_class_for(obs) - - unless klass < ActiveModel::Observer - raise ArgumentError.new("#{obs} does not refer to a valid observer") - end - - if enabled - disabled_observers.delete(klass) - else - disabled_observers << klass - end - end - - each_subclass_array do |array| - array.set_enablement(enabled, observers) - end - end - end - end -end |