localSampler: require()

in packages/core/lib/middleware/sampling/default_sampler.js [11:43]

• 26 lines of code
• 5 McCabe index (conditional complexity)

  localSampler: require('./local_sampler'),
  rulePoller: require('./rule_poller'),
  targetPoller: require('./target_poller'),
  ruleCache: require('./rule_cache'),
  started: false,

  /**
   * Makes a sample decision based on the sample request.
   * @param {object} sampleRequest - Contains information for rules matching.
   * @module DefaultSampler
   * @function shouldSample
   */
  shouldSample: function shouldSample(sampleRequest) {
    try {
      if (!this.started) {
        this.start();
      }
      if (!sampleRequest.serviceType) {
        sampleRequest.serviceType = SegmentUtils.origin;
      }
      var now = Math.floor(new Date().getTime() / 1000);
      var matchedRule = this.ruleCache.getMatchedRule(sampleRequest, now);
      if (matchedRule) {
        logger.getLogger().debug(util.format('Rule %s is matched.', matchedRule.getName()));
        return processMatchedRule(matchedRule, now);
      } else {
        logger.getLogger().info('No effective centralized sampling rule match. Fallback to local rules.');
        return this.localSampler.shouldSample(sampleRequest);
      }
    } catch (err) {
      logger.getLogger().error('Unhandled exception by the SDK during making sampling decisions: ' + err);
    }
  },