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# frozen_string_literal: true
module Gitlab
module Database
##
# This class is used to make it possible to ensure read consistency in
# GitLab EE without the need of overriding a lot of methods / classes /
# classs.
#
# This is a CE class that does nothing in CE, because database load
# balancing is EE-only feature, but you can still use it in CE. It will
# start ensuring read consistency once it is overridden in EE.
#
# Using this class in CE helps to avoid creeping discrepancy between CE /
# EE only to force usage of the primary database in EE.
#
class Consistency
##
# In CE there is no database load balancing, so all reads are expected to
# be consistent by the ACID guarantees of a single PostgreSQL instance.
#
# This method is overridden in EE.
#
def self.with_read_consistency(&block)
yield
end
end
end
end
::Gitlab::Database::Consistency.singleton_class.prepend_if_ee('EE::Gitlab::Database::Consistency')
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