Type:
Module
This module is used to encapsulate access to thread local variables.
Instead of polluting the thread locals namespace:
1 | Thread.current[:connection_handler] |
you define a class that extends this module:
1 2 3 4 5 6 7 | module ActiveRecord class RuntimeRegistry extend ActiveSupport::PerThreadRegistry attr_accessor :connection_handler endend |
and invoke the declared instance accessors as class methods. So
1 | ActiveRecord::RuntimeRegistry.connection_handler = connection_handler |
sets a connection handler local to the current thread, and
1 | ActiveRecord::RuntimeRegistry.connection_handler |
returns a connection handler local to the current thread.
This feature is accomplished by instantiating the class and storing the
instance as a thread local keyed by the class name. In the example above a
key “ActiveRecord::RuntimeRegistry” is stored in
Thread.current. The class methods proxy to said thread local
instance.
If the class has an initializer, it must accept no arguments.