override fun connectionReleased(connection: Connection) {
  }

  override fun connectionConnectionAcquired(connection: RealConnection) {
  }

  override fun connectionConnectionReleased(connection: RealConnection) {
  }

  override fun connectionConnectionClosed(connection: RealConnection) {
  }

  override fun noNewExchanges(connection: RealConnection) {
  }

  }

  override fun connectionConnectionAcquired(connection: RealConnection) {
    connection.connectionListener.connectionAcquired(connection, call)
  }

  override fun connectionConnectionReleased(connection: RealConnection) {
    connection.connectionListener.connectionReleased(connection, call)
  }

  override fun connectionConnectionClosed(connection: RealConnection) {

      return ReusePlan(candidate)
    }

    // The call's connection was released.
    toClose?.closeQuietly()
    connectionUser.connectionReleased(candidate)
    connectionUser.connectionConnectionReleased(candidate)
    if (toClose != null) {
      connectionUser.connectionConnectionClosed(candidate)
    } else if (noNewExchangesEvent) {
      connectionUser.noNewExchanges(candidate)
    }
    return null