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module ArJdbc
module Util
# Caches table and column name (quoted) outcomes.
# Uses {ThreadSafe::Cache} as a concurrent lock free (on JRuby) cache backend.
# The thread_safe gem is a dependency since ActiveSupport 4.0, when using
# ActiveRecord <= 3.2 one should add `gem 'thread_safe'` into the *Gemfile*
# as it is not forced (currently) as an explicit gem dependency.
#
# Caching can also be disabled by setting the *arjdbc.quoted_cache.disabled*
# system property = 'true'.
module QuotedCache
# @private
DISABLED = Java::JavaLang::Boolean.getBoolean('arjdbc.quoted_cache.disabled')
def self.included(base)
# the thread_safe gem is an ActiveSupport dependency (since 4.0) :
begin; require 'thread_safe'; rescue LoadError; end unless DISABLED
if ! DISABLED && defined? ThreadSafe::Cache
base.const_set :QUOTED_TABLE_NAMES, ThreadSafe::Cache.new
base.const_set :QUOTED_COLUMN_NAMES, ThreadSafe::Cache.new
else
base.const_set :QUOTED_TABLE_NAMES, nil
base.const_set :QUOTED_COLUMN_NAMES, nil
end
end
# Caches quoted table names, the cache is stored in the class'
# `QUOTED_TABLE_NAMES` constant.
# @return [String]
def quote_table_name(name)
if cache = self.class::QUOTED_TABLE_NAMES
unless quoted = cache[name]
quoted = super
cache.put_if_absent name, quoted.freeze
end
quoted
else
super
end
end
# Caches quoted table names, the cache is stored in the class'
# `QUOTED_COLUMN_NAMES` constant.
# @return [String]
def quote_column_name(name)
if cache = self.class::QUOTED_COLUMN_NAMES
unless quoted = cache[name]
quoted = super
cache.put_if_absent name, quoted.freeze
end
quoted
else
super
end
end
end
end
end
Version data entries
19 entries across 19 versions & 1 rubygems