addRule method

void addRule(DVAlertRule rule)

Implementation

void addRule(DVAlertRule rule) {
  if (rule.forDuration <= Duration.zero) {
    throw ArgumentError.value(rule.forDuration, 'forDuration',
        'a rule that fires on a single sample fires on a pause; give it a '
        'positive duration');
  }
  final Duration? resolveAfter = rule.resolveAfter;
  if (resolveAfter != null && resolveAfter < Duration.zero) {
    throw ArgumentError.value(resolveAfter, 'resolveAfter', 'is negative');
  }
  final Object threshold = rule.condition.threshold;
  if (rule.signal.measuresDuration ? threshold is! Duration : threshold is! num) {
    throw ArgumentError.value(
      threshold,
      'condition',
      rule.signal.measuresDuration
          ? '${rule.signal} is a duration; give the threshold as a Duration'
          : '${rule.signal} is a number; give the threshold as a number',
    );
  }
  if (_rules.containsKey(rule.name)) {
    throw ArgumentError.value(
        rule.name, 'name', 'a rule with this name is already declared');
  }
  _rules[rule.name] = _RuleState(rule);
  if (rule.notify.isEmpty) {
    _diagnose('DV-ALERT-005',
        'rule ${rule.name} has no target; when it fires nobody hears');
  }
}