2016-09-16 19:33:38 +02:00
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const Backbone = require('backbone');
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2019-09-15 08:47:57 +02:00
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const Launcher = require('../launcher');
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2016-09-16 19:33:38 +02:00
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const LocalStorageKeyName = 'instanceCheck';
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const LocalStorageResponseKeyName = 'instanceMaster';
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2017-01-31 07:50:28 +01:00
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const instanceKey = Date.now().toString();
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2016-09-16 19:33:38 +02:00
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2017-01-31 07:50:28 +01:00
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const SingleInstanceChecker = {
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2019-08-18 10:17:09 +02:00
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init() {
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2016-09-16 19:33:38 +02:00
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if (Launcher) {
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return;
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}
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window.addEventListener('storage', SingleInstanceChecker.storageChanged);
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SingleInstanceChecker.setKey(LocalStorageKeyName, instanceKey);
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},
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2019-08-18 10:17:09 +02:00
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storageChanged(e) {
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2016-09-16 19:33:38 +02:00
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if (!e.newValue) {
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return;
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}
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if (e.key === LocalStorageKeyName && e.newValue !== instanceKey) {
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2019-08-18 08:05:38 +02:00
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SingleInstanceChecker.setKey(
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LocalStorageResponseKeyName,
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instanceKey + Math.random().toString()
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);
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2016-09-16 19:33:38 +02:00
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} else if (e.key === LocalStorageResponseKeyName && e.newValue.indexOf(instanceKey) < 0) {
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window.removeEventListener('storage', SingleInstanceChecker.storageChanged);
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Backbone.trigger('second-instance');
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}
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},
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2019-08-18 10:17:09 +02:00
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setKey(key, value) {
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2016-09-16 19:33:38 +02:00
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try {
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localStorage.setItem(key, value);
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2019-08-16 23:05:39 +02:00
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setTimeout(() => {
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localStorage.removeItem(key);
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}, 100);
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2016-09-16 19:33:38 +02:00
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} catch (e) {}
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}
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};
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module.exports = SingleInstanceChecker;
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