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Class: ActiveSupport::WeakKeyMap

Do not use. This class is for internal use only.
Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
ActiveRecord::AssociationRoute::Cache, ActiveRecord::ConnectionAdapters::ConnectionPool::LeaseRegistry
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ObjectSpace::WeakKeyMap
Instance Chain:
self, ObjectSpace::WeakKeyMap
Inherits: ObjectSpace::WeakKeyMap
Defined in: activesupport/lib/active_support/weak_key_map.rb,
activesupport/lib/active_support/weak_key_map.rb,
activesupport/lib/active_support/weak_key_map.rb

Class Method Summary

Instance Method Summary

Constructor Details

.new ⇒ WeakKeyMap

[ GitHub ] 

  


# File 'activesupport/lib/active_support/weak_key_map.rb', line 12



def initialize
  @map = ObjectSpace::WeakKeyMap.new
  @mutex = Mutex.new
end


  







Instance Method Details



  

    #[](key)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/weak_key_map.rb', line 17



def [](key)
  @mutex.synchronize { @map[key] }
end


  








  

    #[]=(key, value)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/weak_key_map.rb', line 21



def []=(key, value)
  @mutex.synchronize { @map[key] = value }
end


  








  

    #clear  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/weak_key_map.rb', line 29



def clear
  @mutex.synchronize { @map.clear }
  self
end


  








  

    #delete(key)  
  

  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/weak_key_map.rb', line 25



def delete(key)
  @mutex.synchronize { @map.delete(key) }
end


  








  

    #fetch_or_store(key)  
  



  

    
Returns the cached value, computing and storing it when nil. This is not
atomic: concurrent misses may double-compute and then return different values.

  



  [ GitHub ]


  

  


# File 'activesupport/lib/active_support/weak_key_map.rb', line 39



def fetch_or_store(key)
  value = self[key]
  return value unless value.nil?
  value = yield
  self[key] ||= value
end