Contents

class Batch < ActiveFedora::Base
  include Hydra::AccessControls::Permissions
  include Sufia::ModelMethods
  include Sufia::Noid

  has_many :generic_files, predicate: ActiveFedora::RDF::Fcrepo::RelsExt.isPartOf

  property :creator, predicate: ::RDF::DC.creator
  property :title, predicate: ::RDF::DC.title
  property :status, predicate: ::RDF::DC.type

  def self.find_or_create(id)
    begin
      Batch.find(id)
    rescue ActiveFedora::ObjectNotFoundError
      safe_create(id)
    end
  end

  private

    # This method handles most race conditions gracefully. 
    # If a batch with the same ID is created by another thread
    # we fetch the batch that was created (rather than throwing
    # an error) and continute.
    def self.safe_create(id)
      begin      
        Batch.create(id: id)
      rescue ActiveFedora::IllegalOperation
        # This is the exception thrown by LDP when we attempt to 
        # create a duplicate object. If we can find the object
        # then we are good to go.
        Batch.find(id)
      end
    end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
sufia-models-6.2.0	app/models/batch.rb
sufia-models-6.1.0	app/models/batch.rb