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require 'benchmark/ips'

require 'sequel'

if ARGV.last == 'plugin'

  class Sequel::Model

    plugin :accessed_columns

    plugin :active_model

    plugin :association_pks

    plugin :auto_validations

    plugin :columns_updated

    plugin :composition

    plugin :dirty

    plugin :forbid_lazy_load

    plugin :insert_conflict

    plugin :instance_filters

    plugin :instance_hooks

    plugin :json_serializer

    plugin :serialization

    plugin :serialization_modification_detection

    plugin :tactical_eager_loading

    plugin :update_primary_key

    plugin :validation_contexts

  end

end

if ARGV.first == 'eager_initialize'

  module Sequel::Model::ClassMethods

    def call(values)

      o = allocate

      o.instance_variable_set(:@values, values)

      o.instance_variable_set(:@new, nil)

      o.instance_variable_set(:@modified, nil)

      o.instance_variable_set(:@singleton_setter_added, nil)

      o.instance_variable_set(:@errors, nil)

      o.instance_variable_set(:@this, nil)

      o.instance_variable_set(:@server, nil)

      o.instance_variable_set(:@skip_validation_on_next_save, nil)

      o.instance_variable_set(:@changed_columns, nil)

      o

    end

  end 

  module Sequel::Model::Associations::ClassMethods

    def call(values)

      o = super

      o.instance_variable_set(:@associations, nil)

      o.instance_variable_set(:@set_associated_object_if_same, nil)

      o

    end

  end

  if ARGV.last == 'plugin'

    module Sequel::Plugins

      module AccessedColumns

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@accessed_columns, nil)

            o

          end

        end

      end

      module ActiveModel

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@_to_partial_path, nil)

            o.instance_variable_set(:@destroyed, nil)

            o.instance_variable_set(:@rollback_checker, nil)

            o

          end

        end

      end

      module AssociationPks

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@_association_pks, nil)

            o

          end

        end

      end

      module AutoValidations

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@_skip_auto_validations, nil)

            o

          end

        end

      end

      module ColumnsUpdated

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@columns_updated, nil)

            o

          end

        end

      end

      module Composition

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@compositions, nil)

            o

          end

        end

      end

      module Dirty

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@initial_values, nil)

            o.instance_variable_set(:@missing_initial_values, nil)

            o.instance_variable_set(:@previous_changes, nil)

            o

          end

        end

      end

      module ForbidLazyLoad

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@forbid_lazy_load, nil)

            o

          end

        end

      end

      module InsertConflict

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@insert_conflict_opts, nil)

            o

          end

        end

      end

      module InstanceFilters

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@instance_filters, nil)

            o

          end

        end

      end

      module InstanceHooks

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@instance_hooks, nil)

            o

          end

        end

      end

      module JsonSerializer

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@json_serializer_opts, nil)

            o

          end

        end

      end

      module Serialization

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@deserialized_values, nil)

            o

          end

        end

      end

      module SerializationModificationDetection

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@original_deserialized_values, nil)

            o

          end

        end

      end

      module TacticalEagerLoading

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@retrieved_by, nil)

            o.instance_variable_set(:@retrieved_with, nil)

            o

          end

        end

      end

      module UpdatePrimaryKey

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@pk_hash, nil)

            o

          end

        end

      end

      module ValidationContexts

        module ClassMethods

          def call(values)

            o = super

            o.instance_variable_set(:@validation_context, nil)

            o

          end

        end

      end

    end

  end

end

DB = Sequel.connect(ENV["DATABASE_URL"] || 'sqlite:/')

DB.create_table!(:ts){String :s}

class T < Sequel::Model; end

DB[:ts].import([:s], [[""]] * 1000)

Benchmark.ips do |x|

  x.report("Retrieve 1000 rows"){T.all}

end