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Contents
# frozen_string_literal: true
module ArJdbc
# Defines an AR-JDBC extension. An extension consists of a declaration using
# this method and an ArJdbc::XYZ module that contains implementation and
# overrides for methods in ActiveRecord::ConnectionAdapters::AbstractAdapter.
# When you declare your extension, you provide a block that detects when a
# database configured to use the extension is present and loads the necessary
# code for it. AR-JDBC will patch the code into the base JdbcAdapter by
# extending an instance of it with your extension module.
#
# +name+ the name of a module to be defined under the +ArJdbc+ module.
#
# +block+ should be a one- or two-arity block that receives the dialect name
# or driver class name as the first argument, and optionally the whole
# database configuration hash as a second argument
#
# Example:
#
# ArJdbc.extension :FRoB do |name|
# if name =~ /frob/i
# require 'arjdbc/frob' # contains ArJdbc::FRoB
# true
# end
# end
#
def self.extension(name, &block)
if const_defined?(name)
mod = const_get(name)
else
mod = const_set(name, Module.new)
end
(class << mod; self; end).instance_eval do
define_method :adapter_matcher do |_name, config|
if block.arity == 1
block.call(_name) ? mod : false
else
block.call(_name, config) ? mod : false
end
end
end unless mod.respond_to?(:adapter_matcher)
end
private
def self.discover_extensions
if defined?(Gem) && Gem.respond_to?(:find_files)
files = Gem.find_files('arjdbc/discover')
else
files = $LOAD_PATH.map do |path|
discover = File.join(path, 'arjdbc', 'discover.rb')
File.exist?(discover) ? discover : nil
end.compact
end
files.each do |file|
puts "Loading AR-JDBC extension #{file}" if $DEBUG
require file
end
end
end
Version data entries
33 entries across 33 versions & 2 rubygems