method

try_to_checkout_new_connection

v5.0.0.1 - Show latest stable - 0 notes - Class: ActiveRecord::ConnectionAdapters::ConnectionPool

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What's this?

try_to_checkout_new_connection() private

If the pool is not at a +@size+ limit, establish new connection. Connecting to the DB is done outside main synchronized section.

Show source

# File activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb, line 731
      def try_to_checkout_new_connection
        # first in synchronized section check if establishing new conns is allowed
        # and increment @now_connecting, to prevent overstepping this pool's @size
        # constraint
        do_checkout = synchronize do
          if @new_cons_enabled && (@connections.size + @now_connecting) < @size
            @now_connecting += 1
          end
        end
        if do_checkout
          begin
            # if successfully incremented @now_connecting establish new connection
            # outside of synchronized section
            conn = checkout_new_connection
          ensure
            synchronize do
              if conn
                adopt_connection(conn)
                # returned conn needs to be already leased
                conn.lease
              end
              @now_connecting -= 1
            end
          end
        end
      end

try_to_checkout_new_connection

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