@grafana/ui/dist/esm/components/SetInterval/SetInterval.mjs

Grafana Components Library

import { isEqual } from 'lodash';
import { PureComponent } from 'react';
import { Subject, of, NEVER, interval } from 'rxjs';
import { switchMap, tap } from 'rxjs/operators';
import { stringToMs } from '@grafana/data';
import { RefreshPicker } from '../RefreshPicker/RefreshPicker.mjs';

class SetInterval extends PureComponent {
  constructor(props) {
    super(props);
    this.propsSubject = new Subject();
    this.subscription = null;
  }
  componentDidMount() {
    this.subscription = this.propsSubject.pipe(
      // switchMap creates a new observables based on the input stream,
      // which becomes part of the propsSubject stream
      switchMap((props) => {
        if (RefreshPicker.isLive(props.interval)) {
          return of({});
        }
        return props.loading ? NEVER : interval(stringToMs(props.interval));
      }),
      // tap will execute function passed via func prop
      // * on value from `of` stream merged if query is live
      // * on specified interval (triggered by values emitted by interval)
      tap(() => this.props.func())
    ).subscribe();
    this.propsSubject.next(this.props);
  }
  componentDidUpdate(prevProps) {
    if (RefreshPicker.isLive(prevProps.interval) && RefreshPicker.isLive(this.props.interval) || isEqual(prevProps, this.props)) {
      return;
    }
    this.propsSubject.next(this.props);
  }
  componentWillUnmount() {
    if (this.subscription) {
      this.subscription.unsubscribe();
    }
    this.propsSubject.unsubscribe();
  }
  render() {
    return null;
  }
}

export { SetInterval };
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