Module: Sandthorn::AggregateRoot::Base::ClassMethods

Defined in:
lib/sandthorn/aggregate_root_base.rb

Constant Summary collapse

@@aggregate_trace_information = 
nil

Instance Method Summary collapse

Instance Method Details

#aggregate_build(events) ⇒ Object 



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# File 'lib/sandthorn/aggregate_root_base.rb', line 90

def aggregate_build events
  first_event = events.first()
  current_aggregate_version = 0
  if first_event[:event_name] == "aggregate_set_from_snapshot"
    aggregate = first_event[:event_args][0]
    current_aggregate_version = aggregate.aggregate_originating_version
    events.shift
  else
    new_args = events.first()[:event_args][:method_args]

    if new_args.nil?
      aggregate = new
    else
      aggregate = new *new_args
    end
    aggregate.send :aggregate_clear_current_event_version!
  end

  attributes = {}
  events.each do |event|
    event_args = event[:event_args]
    event_name = event[:event_name]

    next if event_name == "aggregate_set_from_snapshot"
    next if event_name == "instance_extended_as_aggregate"

    attribute_deltas = event_args[:attribute_deltas]

    unless event[:aggregate_version].nil?
      current_aggregate_version = event[:aggregate_version]
    end

    unless attribute_deltas.nil?
      deltas = attribute_deltas.each_with_object({}) do |delta, acc|
        acc[delta[:attribute_name]] = delta[:new_value]
      end

      attributes.merge! deltas
    end
  end
  aggregate.send :clear_aggregate_events
  aggregate.send :set_orginating_aggregate_version!, current_aggregate_version
  aggregate.send :set_current_aggregate_version!, current_aggregate_version
  aggregate.send :set_instance_variables!, attributes
  aggregate
end

#aggregate_trace(args) {|_self| ... } ⇒ Object

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/sandthorn/aggregate_root_base.rb', line 61

def aggregate_trace args
  @@aggregate_trace_information = args
  @aggregate_trace_information = args
  yield self
  @@aggregate_trace_information = nil
  @aggregate_trace_information = nil
end

#find(aggregate_id) ⇒ Object

Raises:



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# File 'lib/sandthorn/aggregate_root_base.rb', line 69

def find aggregate_id
  class_name = self.respond_to?(:name) ? self.name : self.class # to be able to extend a string for example.
  events = Sandthorn.get_aggregate(aggregate_id, class_name)
  raise Sandthorn::Errors::AggregateNotFound unless events and !events.empty?

  transformed_events = events.map { |e| e.merge(event_args: Sandthorn.deserialize(e[:event_data])) }
  aggregate_build transformed_events
end

#new(*args) ⇒ Object 



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# File 'lib/sandthorn/aggregate_root_base.rb', line 78

def new *args
  aggregate = super
  aggregate.aggregate_base_initialize

  aggregate.aggregate_trace @@aggregate_trace_information do |aggr|
    aggr.aggregate_initialize
    aggr.send :set_aggregate_id, Sandthorn.generate_aggregate_id
    aggr.send :commit, *args, method_name: "new"
    return aggr
  end
end