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# encoding: UTF-8
require 'set'
module MongoMapper
module Plugins
module IdentityMap
extend ActiveSupport::Concern
def self.enabled=(flag)
Thread.current[:mongo_mapper_identity_map_enabled] = flag
end
def self.enabled
Thread.current[:mongo_mapper_identity_map_enabled]
end
def self.enabled?
enabled == true
end
def self.repository
Thread.current[:mongo_mapper_identity_map] ||= {}
end
def self.clear
repository.clear
end
def self.include?(document)
repository.key?(IdentityMap.key(document.class, document._id))
end
def self.key(model, id)
"#{model.single_collection_root.name}:#{id}"
end
def self.use
old, self.enabled = enabled, true
yield if block_given?
ensure
self.enabled = old
clear
end
def self.without
old, self.enabled = enabled, false
yield if block_given?
ensure
self.enabled = old
end
module ClassMethods
# Private - Looks for a document in the identity map
def get_from_identity_map(id)
IdentityMap.repository[IdentityMap.key(self, id)]
end
def query(opts={})
super.tap do |query|
query.identity_map = self if Thread.current[:mongo_mapper_identity_map_enabled]
end
end
def remove_documents_from_map(*documents)
documents.flatten.compact.each do |document|
document.remove_from_identity_map
end
end
def load(attrs, with_cast = false)
return super unless Thread.current[:mongo_mapper_identity_map_enabled]
return nil unless attrs
document = get_from_identity_map(attrs['_id'])
if !document
document = super
document.add_to_identity_map
end
document
end
end
def save(*args)
super.tap { |result| add_to_identity_map if result }
end
def delete
super.tap { remove_from_identity_map }
end
def add_to_identity_map
if IdentityMap.enabled?
key = IdentityMap.key(self.class, _id)
IdentityMap.repository[key] = self
end
end
def remove_from_identity_map
if IdentityMap.enabled?
key = IdentityMap.key(self.class, _id)
IdentityMap.repository.delete(key)
end
end
end
end
end
module PluckyMethods
module ClassMethods
extend ActiveSupport::Concern
included do
attr_accessor :identity_map
# Ensure that these aliased methods in plucky also get overridden.
alias_method :first, :find_one
alias_method :each, :find_each
end
def find_one(opts={})
query = clone.amend(opts)
if identity_map && query.simple? && (document = identity_map.get_from_identity_map(query[:_id]))
document
else
super.tap do |doc|
doc.remove_from_identity_map if doc && query.fields?
end
end
end
def find_each(opts={})
query = clone.amend(opts)
super(opts) do |doc|
doc.remove_from_identity_map if doc && query.fields?
yield doc if block_given?
end
end
end
end
::MongoMapper::Plugins::Querying::DecoratedPluckyQuery.send :include, ::PluckyMethods::ClassMethods
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