service-worker.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/* global self, caches */
'use strict';

const CACHE_NAME = 'powerai-vision-object-detection';

const urlstocache = [
  'css/index.css',
  'js/index.js',
];

// install/cache page assets
self.addEventListener('install', function(event) {
  event.waitUntil(
      caches.open(CACHE_NAME)
          .then(function(cache) {
            console.log('cache opened');
            return cache.addAll(urlstocache);
          }),
  );
});


// service worker activated, remove outdated cache
self.addEventListener('activate', function(event) {
  console.log('worker activated');
  event.waitUntil(
      caches.keys().then(function(keys) {
        return Promise.all(
            keys.filter(function(key) {
              // filter old versioned keys
              return key !== CACHE_NAME;
            }).map(function(key) {
              return caches.delete(key);
            }),
        );
      }),
  );
});