Class: ActiveRecord::ConnectionAdapters::StatementPool

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
activerecord/lib/active_record/connection_adapters/statement_pool.rb

Overview

:nodoc:

Constant Summary collapse

DEFAULT_STATEMENT_LIMIT = 
1000

Instance Method Summary collapse

Methods included from Enumerable

#as_json, #compact_blank, #exclude?, #excluding, #in_order_of, #including, #index_by, #index_with, #many?, #maximum, #minimum, #pick, #pluck, #sole

Constructor Details

#initialize(statement_limit = nil) ⇒ StatementPool

Returns a new instance of StatementPool.



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# 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) ⇒ Object 



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

def [](key)
  cache[key]
end

#[]=(sql, stmt) ⇒ Object 



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# 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

#clear ⇒ Object 



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# 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

#delete(key) ⇒ Object 



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

def delete(key)
  if stmt = cache.delete(key)
    dealloc(stmt)
  end
  stmt
end

#each(&block) ⇒ Object 



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

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

#key?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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

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

#length ⇒ Object 



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

def length
  cache.length
end

#reset ⇒ Object

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)



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

def reset
  cache.clear
end