class ActiveRecord::ConnectionAdapters::RedshiftAdapter::StatementPool

Public Class Methods

new(connection, max) click to toggle source
Calls superclass method
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 289
def initialize(connection, max)
  super
  @counter = 0
  @cache   = Hash.new { |h,pid| h[pid] = {} }
end

Public Instance Methods

[](key) click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 297
def [](key);      cache[key]; end
[]=(sql, key) click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 304
def []=(sql, key)
  while @max <= cache.size
    dealloc(cache.shift.last)
  end
  @counter += 1
  cache[sql] = key
end
clear() click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 312
def clear
  cache.each_value do |stmt_key|
    dealloc stmt_key
  end
  cache.clear
end
delete(sql_key) click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 319
def delete(sql_key)
  dealloc cache[sql_key]
  cache.delete sql_key
end
each(&block) click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 295
def each(&block); cache.each(&block); end
key?(key) click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 296
def key?(key);    cache.key?(key); end
length() click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 298
def length;       cache.length; end
next_key() click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 300
def next_key
  "a#{@counter + 1}"
end

Private Instance Methods

cache() click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 325
def cache
  @cache[$$]
end
connection_active?() click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 333
def connection_active?
  @connection.status == PGconn::CONNECTION_OK
rescue PGError
  false
end
dealloc(key) click to toggle source
# File lib/active_record/connection_adapters/redshift_adapter.rb, line 329
def dealloc(key)
  @connection.query "DEALLOCATE #{key}" if connection_active?
end