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# File activerecord/lib/active_record/connection_adapters/abstract/connection_handler.rb, line 77
      def initialize
        # These caches are keyed by pool_config.connection_name (PoolConfig#connection_name).
        @connection_name_to_pool_manager = Concurrent::Map.new(initial_capacity: 2)

        # Backup finalizer: if the forked child skipped Kernel#fork the early discard has not occurred
        ObjectSpace.define_finalizer self, FINALIZER
      end
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