scheduleCloser()
  }

  /**
   * Notify this pool that [connection] has become idle. Returns true if the connection has been
   * removed from the pool and should be closed.
   */
  fun connectionBecameIdle(connection: RealConnection): Boolean {
    connection.assertLockHeld()

    return if (connection.noNewExchanges || maxIdleConnections == 0) {
      connection.noNewExchanges = true