b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
139 lines
3.1 KiB
JavaScript
Executable file
139 lines
3.1 KiB
JavaScript
Executable file
define(function(require, exports, module) {
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'use strict';
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var Abstract = require('./abstract');
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var denodeifyAll = require('common/promise').denodeifyAll;
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var nextTick = require('common/next_tick');
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function Setting() {
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Abstract.apply(this, arguments);
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denodeifyAll(this, [
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'getValue',
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'set'
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]);
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}
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module.exports = Setting;
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Setting.prototype = {
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__proto__: Abstract.prototype,
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_store: 'settings',
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/**
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* Default option values.
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*/
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defaults: {
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standardAlarmDefault: -300,
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alldayAlarmDefault: 32400,
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syncFrequency: 15,
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syncAlarm: {
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alarmId: null,
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start: null,
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end: null
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}
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},
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/** disable caching */
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_addToCache: function() {},
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_removeFromCache: function() {},
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/**
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* This method also will use the internal cache to ensure
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* callers are in a consistent state and don't require round
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* trips to the database. When the value does not exist defaults
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* are used where possible...
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*
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*
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* settings.getValue('syncFrequency', function(err, value) {
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* // ...
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* });
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*
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*
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* @param {String} key name of setting.
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* @param {Function} callback usual [err, value] does not include metadata.
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*/
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getValue: function(key, callback) {
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var self = this;
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if (key in this._cached) {
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nextTick(function handleCached() {
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callback(null, self._cached[key].value);
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});
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// we have cached value exit...
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return;
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}
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this.get(key, function handleStored(err, value) {
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if (err) {
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return callback(err);
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}
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if (value === undefined && self.defaults[key] !== undefined) {
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value = { value: self.defaults[key] };
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}
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self._cached[key] = value;
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callback(null, value.value);
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});
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},
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/**
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* Persist a setting change.
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*
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* In addition to updating the value of the setting
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* it will also update the updatedAt & createdAt properties
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* of the record.
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*
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* Calling this function will also emit a 'change' event
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* prior to fully persisting the record to the database.
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*
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* Example:
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*
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* var settingStore;
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*
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* settingStore.set('syncFrequency', 15, function() {
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* // done
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* });
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*
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* // somewhere else in the app:
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*
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* settingStore.on('syncFrequencyChange', function(value) {
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* // value === 15
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* });
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*
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* @param {String} key name of setting.
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* @param {Object} value any object that IndexedDb can store.
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* @param {IDBTransaction} [trans] idb transaction optional.
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* @param {Function} [callback] optional callback.
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*/
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set: function(key, value, trans, callback) {
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if (typeof(trans) === 'function') {
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callback = trans;
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trans = null;
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}
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var cached = this._cached[key];
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var record;
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if (cached && cached._id) {
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cached.value = value;
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cached.updatedAt = new Date();
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record = cached;
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} else {
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var created = new Date();
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this._cached[key] = record = {
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_id: key,
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createdAt: created,
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updatedAt: created,
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value: value
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};
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}
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this.emit(key + 'Change', value, record);
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this.persist(record, trans, callback);
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}
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};
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});
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