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module Tins
module ThreadLocal
@@cleanup = lambda do |my_object_id|
my_id = "__thread_local_#{my_object_id}__"
for t in Thread.list
t[my_id] = nil if t[my_id]
end
end
# Define a thread local variable named _name_ in this module/class. If the
# value _value_ is given, it is used to initialize the variable.
def thread_local(name, default_value = nil, &default)
is_a?(Module) or raise TypeError, "receiver has to be a Module"
default_value && default and raise ArgumentError,
"require either default_falue or default block"
if default_value
default = -> * { default_value }
end
name = name.to_s
my_id = "__thread_local_#{__id__}__"
ObjectSpace.define_finalizer(self, @@cleanup)
define_method(name) do
values = Thread.current[my_id] ||= {}
if default && !values.key?(name)
values[name] = default.call
end
values[name]
end
define_method("#{name}=") do |value|
Thread.current[my_id] ||= {}
Thread.current[my_id][name] = value
end
self
end
# Define a thread local variable for the current instance with name _name_.
# If the value _value_ is given, it is used to initialize the variable.
def instance_thread_local(name, default_value = nil, &default)
class << self
extend Tins::ThreadLocal
self
end.thread_local name, default_value, &default
self
end
end
end
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