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require 'concurrent/constants'
module Concurrent
# @!macro thread_local_var
# @!macro internal_implementation_note
# @!visibility private
class AbstractThreadLocalVar
# @!macro thread_local_var_method_initialize
def initialize(default = nil, &default_block)
if default && block_given?
raise ArgumentError, "Cannot use both value and block as default value"
end
if block_given?
@default_block = default_block
@default = nil
else
@default_block = nil
@default = default
end
allocate_storage
end
# @!macro thread_local_var_method_get
def value
raise NotImplementedError
end
# @!macro thread_local_var_method_set
def value=(value)
raise NotImplementedError
end
# @!macro thread_local_var_method_bind
def bind(value, &block)
if block_given?
old_value = self.value
begin
self.value = value
yield
ensure
self.value = old_value
end
end
end
protected
# @!visibility private
def allocate_storage
raise NotImplementedError
end
# @!visibility private
def default
if @default_block
self.value = @default_block.call
else
@default
end
end
end
end
|
