chrome/browser/resources/chromeos/accessibility/common/keep_alive.ts

// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @fileoverview Extends the service worker lifetime indefinitely by calling
 * chrome.runtime.getPlatformInfo() every 20 seconds.
 */

import {TestImportManager} from './testing/test_import_manager.js';

export class KeepAlive {
  static instance?: KeepAlive;
  private interval?: number;

  static init(): void {
    if (!KeepAlive.instance) {
      KeepAlive.instance = new KeepAlive();
      KeepAlive.instance.startHeartbeat();
    }
  }

  static stop(): void {
    if (KeepAlive.instance) {
      clearInterval(KeepAlive.instance.interval);
      delete KeepAlive.instance;
    }
  }

  private runHeartbeat(): void {
    chrome.runtime.getPlatformInfo();
  }

  private startHeartbeat(): void {
    // Run the heartbeat once.
    this.runHeartbeat();

    // Then again every 20 seconds.
    this.interval = setInterval(() => this.runHeartbeat(), 20 * 1000);
  }
}

TestImportManager.exportForTesting(KeepAlive);