Module: DSLKit::ThreadLocal

Included in:
Deflect, Object
Defined in:
lib/dslkit/polite.rb

Constant Summary collapse

@@mutex = 
Mutex.new
@@cleanup = 
lambda do |my_object_id|
  my_id = "__thread_local_#{my_object_id}__"
  @@mutex.synchronize do
    for t in Thread.list
      t[my_id] = nil if t[my_id]
    end
  end
end

Instance Method Summary collapse

Instance Method Details

#instance_thread_local(name, value = nil) ⇒ Object

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.



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# File 'lib/dslkit/polite.rb', line 97

def instance_thread_local(name, value = nil)
  sc = class << self
    extend DSLKit::ThreadLocal
    self
  end
  sc.thread_local name, value
  self
end

#thread_local(name, default_value = nil) ⇒ Object

Define a thread local variable named name in this module/class. If the value value is given, it is used to initialize the variable.



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# File 'lib/dslkit/polite.rb', line 70

def thread_local(name, default_value = nil)
  is_a?(Module) or raise TypeError, "receiver has to be a Module"

  name = name.to_s
  my_id = "__thread_local_#{__id__}__"

  ObjectSpace.define_finalizer(self, @@cleanup)

  define_method(name) do
    Thread.current[my_id] ||= {}
    Thread.current[my_id][name]
  end

  define_method("#{name}=") do |value|
    Thread.current[my_id] ||= {}
    Thread.current[my_id][name] = value
  end

  if default_value
    Thread.current[my_id] = {}
    Thread.current[my_id][name] = default_value
  end
  self
end