@openhps/core/dist/esm5/nodes/shapes/FrameDebounceNode.js

Open Hybrid Positioning System - Core component

import { ProcessingNode } from '../ProcessingNode';
import { TimeUnit } from '../../utils';
/**
 * @category Flow shape
 */
export class FrameDebounceNode extends ProcessingNode {
  constructor(timeout, timeoutUnit) {
    super();
    this._accept = true;
    this._timeout = timeout;
    this._timeoutUnit = timeoutUnit;
    this.once('build', this._start.bind(this));
    this.once('destroy', this._stop.bind(this));
  }
  /**
   * Start the timeout timer
   * @returns {Promise<void>} Timer promise
   */
  _start() {
    return new Promise(resolve => {
      this._timer = setInterval(() => {
        this._accept = true;
      }, this._timeoutUnit.convert(this._timeout, TimeUnit.MILLISECOND));
      resolve();
      this.emit('ready');
    });
  }
  _stop() {
    if (this._timer !== undefined) {
      clearInterval(this._timer);
    }
  }
  process(frame) {
    return new Promise(resolve => {
      if (this._accept) {
        this._accept = false;
        resolve(frame);
      } else {
        resolve(undefined);
      }
    });
  }
}