Method _checkPoolState

lib/host.js:381–397

* Validates that the internal state of the connection pool. * If the pool size is smaller than expected, schedule a new connection attempt. * If the amount of connections is 0 for not ignored hosts, the host must be down. * @private

()

   * @private
   */
  _checkPoolState() {
    if (this.pool.isClosing()) {
      return;
    }
    if (this.pool.connections.length < this.pool.coreConnectionsLength) {
      // the pool needs to grow / reconnect
      if (!this.pool.hasScheduledNewConnection()) {
        this.reconnectionDelay = this.reconnectionSchedule.next().value;
        this.pool.scheduleNewConnectionAttempt(this.reconnectionDelay);
      }
    }
    const shouldHaveConnections = this._distance !== types.distance.ignored && this.pool.coreConnectionsLength > 0;
    if (shouldHaveConnections && this.pool.connections.length === 0) {
      // Mark as DOWN, if its UP
      this.setDown();
    }
  }

  /**
   * Executed after an scheduled new connection attempt finished