Class: ObjectTracker

Inherits:
Object show all
Defined in:
lib/volt/reactive/object_tracker.rb

Constant Summary collapse

@@queue = 
{}
@@cache_enabled = 
false
@@cache_version = 
0

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(main_object) ⇒ ObjectTracker

Returns a new instance of ObjectTracker.



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# File 'lib/volt/reactive/object_tracker.rb', line 20

def initialize(main_object)
  # puts "NEW OBJECT TRACKER FOR: #{main_object.inspect}"
  @main_object = main_object
  @enabled = false
end

Class Method Details

.cache_enabled ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 8

def self.cache_enabled
  @@cache_enabled
end

.cache_version ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 12

def self.cache_version
  @@cache_version
end

.clear_cache ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 16

def self.clear_cache
  @@cache_version = (@@cache_version || 0) + 1
end

.process_queue ⇒ Object

Run through the queue and update the followers for each



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# File 'lib/volt/reactive/object_tracker.rb', line 36

def self.process_queue
  # puts "PROCESS QUEUE: #{@@queue.size}"
  puts "Process #{@@queue.size} items" if OBJECT_TRACKER_DEBUG
  # TODO: Doing a full dup here is expensive?
  queue = @@queue.dup
  
  # Clear before running incase someone adds during
  @@queue = {}

  @@cache_enabled = true
  self.clear_cache

  queue.each_pair do |object_tracker,val|
    object_tracker.update_followers
  end
  
  @@cache_enabled = false
  
end

.queue ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 26

def self.queue
  @@queue
end

Instance Method Details

#disable! ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 64

def disable!
  puts "Disable OBJ Tracker" if OBJECT_TRACKER_DEBUG
  remove_followers
  @@queue.delete(self)
  @enabled = false
end

#enable! ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 56

def enable!
  unless @enabled
    puts "Enable OBJ Tracker" if OBJECT_TRACKER_DEBUG
    @enabled = true
    queue_update
  end
end

#queue_update ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 30

def queue_update
  puts "QUEUE UPDATE" if OBJECT_TRACKER_DEBUG
  @@queue[self] = true
end

#remove_followers ⇒ Object

Remove follower



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# File 'lib/volt/reactive/object_tracker.rb', line 92

def remove_followers
  # Remove from previous
  if @cached_current_obj
    @cached_current_obj.remove_event_follower(@main_object)
    @cached_current_obj = nil
  end
end

#update_followers ⇒ Object 



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# File 'lib/volt/reactive/object_tracker.rb', line 71

def update_followers
  if @enabled
    puts "UPDATE" if OBJECT_TRACKER_DEBUG
    current_obj = @main_object.cur#(true)
    
    # puts "UPDATE ON #{current_obj.inspect}"
  
    remove_followers

    # Add to current
    should_attach = current_obj.respond_to?(:on)
    if should_attach
      current_obj.add_event_follower(@main_object)
      @cached_current_obj = current_obj
    end
  else
    puts "DISABLED, no update" if OBJECT_TRACKER_DEBUG
  end
end