Class: Persistors::ArrayStore

Inherits:
Store show all
Includes:
StoreState
Defined in:
lib/volt/models/persistors/array_store.rb

Constant Summary collapse

@@query_pool = 
QueryListenerPool.new

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from StoreState

#change_state_to, #loaded, #state

Methods inherited from Store

#read_new_model, #saved?

Methods inherited from Base

#changed, #loaded

Constructor Details

#initialize(model, tasks = nil) ⇒ ArrayStore

Returns a new instance of ArrayStore.



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# File 'lib/volt/models/persistors/array_store.rb', line 17

def initialize(model, tasks=nil)
  super

  query = @model.options[:query]

  @query = ReactiveValue.from_hash(query || {})
end

Instance Attribute Details

#model ⇒ Object (readonly)

Returns the value of attribute model.



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# File 'lib/volt/models/persistors/array_store.rb', line 11

def model
  @model
end

Class Method Details

.query_pool ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 13

def self.query_pool
  @@query_pool
end

Instance Method Details

#add(index, data) ⇒ Object

Called from backend



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# File 'lib/volt/models/persistors/array_store.rb', line 127

def add(index, data)
  $loading_models = true

  new_options = @model.options.merge(path: @model.path + [:[]], parent: @model)

  # Don't add if the model is already in the ArrayModel
  if !@model.cur.array.find {|v| v['_id'] == data['_id'] }
    # Find the existing model, or create one
    new_model = @@identity_map.find(data['_id']) { @model.new_model(data.symbolize_keys, new_options, :loaded) }

    @model.insert(index, new_model)
  end

  $loading_models = false
end

#added(model, index) ⇒ Object

When a model is added to this collection, we call its “changed” method. This should trigger a save.



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# File 'lib/volt/models/persistors/array_store.rb', line 165

def added(model, index)
  if model.persistor
    # Tell the persistor it was added
    model.persistor.add_to_collection
  end
end

#channel_name ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 158

def channel_name
  @model.path[-1]
end

#event_added(event, scope_provider, first, first_for_event) ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 25

def event_added(event, scope_provider, first, first_for_event)
  # First event, we load the data.
  load_data if first
end

#event_removed(event, last, last_for_event) ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 30

def event_removed(event, last, last_for_event)
  # Remove listener where there are no more events on this model
  stop_listening if last
end

#find(query = {}) ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 101

def find(query={})
  model = Cursor.new([], @model.options.merge(:query => query))

  return ReactiveValue.new(model)
end

#load_data ⇒ Object

Called the first time data is requested from this collection



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# File 'lib/volt/models/persistors/array_store.rb', line 52

def load_data
  # Don't load data from any queried
  if @state == :not_loaded || @state == :dirty
    # puts "Load Data at #{@model.path.inspect} - query: #{@query.inspect}"# on #{@model.inspect}"
    change_state_to :loading

    @query_changed_listener.remove if @query_changed_listener
    if @query.reactive?
      # puts "SETUP REACTIVE QUERY LISTENER: #{@query.inspect}"
      # Query might change, change the query when it does
      @query_changed_listener = @query.on('changed') do
        stop_listening

        # Don't load again if all of the listeners are gone
        load_data if @model.has_listeners?
      end
    end

    run_query(@model, @query.deep_cur)
  end
end

#remove(ids) ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 143

def remove(ids)
  $loading_models = true
  ids.each do |id|
    # TODO: optimize this delete so we don't need to loop
    @model.each_with_index do |model, index|
      if model._id == id
        del = @model.delete_at(index)
        break
      end
    end
  end

  $loading_models = false
end

#removed(model) ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 172

def removed(model)
  if model.persistor
    # Tell the persistor it was removed
    model.persistor.remove_from_collection
  end

  if defined?($loading_models) && $loading_models
    return
  else
    @tasks.call('StoreTasks', 'delete', channel_name, model.attributes[:_id])
  end
end

#run_query(model, query = {}) ⇒ Object 



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# File 'lib/volt/models/persistors/array_store.rb', line 80

def run_query(model, query={})
  collection = model.path.last
  # Scope to the parent
  if model.path.size > 1
    parent = model.parent

    parent.persistor.ensure_setup if parent.persistor

    if parent && (attrs = parent.attributes) && attrs[:_id].true?
      query[:"#{model.path[-3].singularize}_id"] = attrs[:_id]
    end
  end

  @query_listener = @@query_pool.lookup(collection, query) do
    # Create if it does not exist
    QueryListener.new(@@query_pool, @tasks, collection, query)
  end

  @query_listener.add_store(self)
end

#stop_listening ⇒ Object

Called when an event is removed and we no longer want to keep in sync with the database.



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# File 'lib/volt/models/persistors/array_store.rb', line 37

def stop_listening
  if @query_changed_listener
    @query_changed_listener.remove
    @query_changed_listener = nil
  end

  if @query_listener
    @query_listener.remove_store(self)
    @query_listener = nil
  end

  @state = :dirty
end

#then(&block) ⇒ Object

Returns a promise that is resolved/rejected when the query is complete. Any passed block will be passed to the promises then. Then will be passed the model.



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# File 'lib/volt/models/persistors/array_store.rb', line 109

def then(&block)
  promise = Promise.new

  promise = promise.then(&block) if block

  if @state == :loaded
    promise.resolve(@model)
  else
    @fetch_promises ||= []
    @fetch_promises << promise

    load_data
  end

  return promise
end

#unload_data ⇒ Object

Clear out the models data, since we’re not listening anymore.



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# File 'lib/volt/models/persistors/array_store.rb', line 75

def unload_data
  change_state_to :not_loaded
  @model.clear
end