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Class: ActiveRecord::ConnectionAdapters::QueryCache::QueryCacheRegistry

Do not use. This class is for internal use only.
Relationships & Source Files
Inherits: Object
Defined in: activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb

Overview

Each connection pool has one of these registries. They map execution contexts to query cache stores.

The keys of the internal map are threads or fibers (whatever ActiveSupport::IsolatedExecutionState.context returns), and their associated values are their respective query cache stores.

Class Method Summary

Instance Method Summary

Constructor Details

.new ⇒ QueryCacheRegistry

[ GitHub ] 

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 116



def initialize
  @mutex = Mutex.new
  @map = ConnectionPool::WeakThreadKeyMap.new
end


  







Instance Method Details



  

    #clear  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 127



def clear
  @map.synchronize do
    @map.clear
  end
end


  








  

    #compute_if_absent(context)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb', line 121



def compute_if_absent(context)
  @map[context] || @mutex.synchronize do
    @map[context] ||= yield
  end
end