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module Flipper
class Configuration
def initialize
@default = -> { raise DefaultNotSet }
end
# Controls the default instance for flipper. When used with a block it
# assigns a new default block to use to generate an instance. When used
# without a block, it performs a block invocation and returns the result.
#
# configuration = Flipper::Configuration.new
# configuration.default # => raises DefaultNotSet error.
#
# # sets the default block to generate a new instance using Memory adapter
# configuration.default do
# require "flipper/adapters/memory"
# Flipper.new(Flipper::Adapters::Memory.new)
# end
#
# configuration.default # => Flipper::DSL instance using Memory adapter
#
# Returns result of default block invocation if called without block. If
# called with block, assigns the default block.
def default(&block)
if block_given?
@default = block
else
@default.call
end
end
end
end
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