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52 lines
1.6 KiB
Ruby
52 lines
1.6 KiB
Ruby
module ActiveSupport
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# This module is used to encapsulate access to thread local variables.
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#
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# Instead of polluting the thread locals namespace:
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#
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# Thread.current[:connection_handler]
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#
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# you define a class that extends this module:
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#
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# module ActiveRecord
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# class RuntimeRegistry
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# extend ActiveSupport::PerThreadRegistry
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#
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# attr_accessor :connection_handler
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# end
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# end
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#
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# and invoke the declared instance accessors as class methods. So
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#
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# ActiveRecord::RuntimeRegistry.connection_handler = connection_handler
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#
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# sets a connection handler local to the current thread, and
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#
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# ActiveRecord::RuntimeRegistry.connection_handler
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#
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# returns a connection handler local to the current thread.
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#
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# This feature is accomplished by instantiating the class and storing the
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# instance as a thread local keyed by the class name. In the example above
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# a key "ActiveRecord::RuntimeRegistry" is stored in <tt>Thread.current</tt>.
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# The class methods proxy to said thread local instance.
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#
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# If the class has an initializer, it must accept no arguments.
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module PerThreadRegistry
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protected
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def method_missing(name, *args, &block) # :nodoc:
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# Caches the method definition as a singleton method of the receiver.
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define_singleton_method(name) do |*a, &b|
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per_thread_registry_instance.public_send(name, *a, &b)
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end
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send(name, *args, &block)
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end
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private
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def per_thread_registry_instance
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Thread.current[name] ||= new
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end
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end
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end
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