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Class: ActiveRecord::ConnectionAdapters::StatementPool

Do not use. This class is for internal use only.
Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
AbstractMysqlAdapter::StatementPool, PostgreSQLAdapter::StatementPool, ActiveRecord::ConnectionAdapters::SQLite3Adapter::StatementPool
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, ::Enumerable, ::ActiveSupport::EnumerableCoreExt::Constants
Inherits: Object
Defined in: activerecord/lib/active_record/connection_adapters/statement_pool.rb

Constant Summary

Class Method Summary

Instance Attribute Summary

::Enumerable - Included

#many?

Returns true if the enumerable has more than 1 element.

Instance Method Summary

::Enumerable - Included

#compact_blank

Returns a new ::Array without the blank items.
#exclude?

The negative of the Enumerable#include?.
#excluding

Returns a copy of the enumerable excluding the specified elements.
#in_order_of

Returns a new ::Array where the order has been set to that provided in the series, based on the key of the objects in the original enumerable.
#including

Returns a new array that includes the passed elements.
#index_by

Convert an enumerable to a hash, using the block result as the key and the element as the value.
#index_with

Convert an enumerable to a hash, using the element as the key and the block result as the value.
#maximum

Calculates the maximum from the extracted elements.
#minimum

Calculates the minimum from the extracted elements.
#pick

Extract the given key from the first element in the enumerable.
#pluck

Extract the given key from each element in the enumerable.
#sole

Returns the sole item in the enumerable.
#without

Alias for Enumerable#excluding.
#as_json

::ActiveSupport::EnumerableCoreExt::Constants - Included

#const_missing

Constructor Details

.new(statement_limit = nil) ⇒ StatementPool

[ GitHub ] 

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 10



def initialize(statement_limit = nil)
  @cache = Hash.new { |h, pid| h[pid] = {} }
  @statement_limit = statement_limit || DEFAULT_STATEMENT_LIMIT
end


  







Instance Method Details



  

    #[](key)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 23



def [](key)
  cache[key]
end


  








  

    #[]=(sql, stmt)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 31



def []=(sql, stmt)
  while @statement_limit <= cache.size
    dealloc(cache.shift.last)
  end
  cache[sql] = stmt
end


  








  

    #cache   (private)
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 58



def cache
  @cache[Process.pid]
end


  








  

    #clear  
    Also known as: #reset
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 38



def clear
  cache.each_value do |stmt|
    dealloc stmt
  end
  cache.clear
end


  








  

    #dealloc(stmt)   (private)
  



  

    
  





  
Raises:


    
  
  • 
    (NotImplementedError)
  
    • 





  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 62



def dealloc(stmt)
  raise NotImplementedError
end


  








  

    #delete(key)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 52



def delete(key)
  dealloc cache[key]
  cache.delete(key)
end


  








  

    #each(&block)  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 15



def each(&block)
  cache.each(&block)
end


  








  

    #key?(key)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 19



def key?(key)
  cache.key?(key)
end


  








  

    #length  
  

  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 27



def length
  cache.length
end


  








  

    #reset  
  



  

    

Clear the pool without deallocating; this is only safe when we know the server has independently deallocated all statements (e.g. due to a reconnect, or a DISCARD ALL)


  



  [ GitHub ]


  

  


# File 'activerecord/lib/active_record/connection_adapters/statement_pool.rb', line 48



def reset
  cache.clear
end