Method setDistance

lib/host.js:245–275

* Sets the distance of the host relative to the client using the load balancing policy. * @param {Number} distance * @internal * @ignore

(distance)

   * @ignore
   */
  setDistance(distance) {
    const previousDistance = this._distance;
    this._distance = distance || types.distance.local;
    if (this.options.pooling.coreConnectionsPerHost) {
      this.pool.coreConnectionsLength = this.options.pooling.coreConnectionsPerHost[this._distance] || 0;
    }
    else {
      this.pool.coreConnectionsLength = 1;
    }
    if (this._distance === previousDistance) {
      return this._distance;
    }
    if (this._healthResponseCountTimer) {
      clearInterval(this._healthResponseCountTimer);
    }
    if (this._distance === types.distance.ignored) {
      // this host was local/remote and now must be ignored
      this.emit('ignore');
      this.pool.drainAndShutdown();
    }
    else {
      if (!this.isUp()) {
        this.checkIsUp();
      }
      // Reset the health check timer
      this._healthResponseCountTimer = setInterval(() => {
        this._healthResponseCounter = this.pool.getAndResetResponseCounter();
      }, healthResponseCountInterval);
    }
    return this._distance;
  }

  /**
   * Changes the protocol version of a given host