*/
  private val maxIdleConnections: Int,
  keepAliveDuration: Long,
  timeUnit: TimeUnit,
  internal val connectionListener: ConnectionListener,
  private val exchangeFinderFactory: (RealConnectionPool, Address, ConnectionUser) -> ExchangeFinder,
) {
  internal val keepAliveDurationNs: Long = timeUnit.toNanos(keepAliveDuration)

  @Volatile