67 lines
No EOL
2.1 KiB
JavaScript
67 lines
No EOL
2.1 KiB
JavaScript
/*
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Copyright 2017 Travis Ralston
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import SettingsHandler from "./SettingsHandler";
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/**
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* A wrapper for a SettingsHandler that performs local echo on
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* changes to settings. This wrapper will use the underlying
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* handler as much as possible to ensure values are not stale.
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*/
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export default class LocalEchoWrapper extends SettingsHandler {
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/**
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* Creates a new local echo wrapper
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* @param {SettingsHandler} handler The handler to wrap
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*/
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constructor(handler) {
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super();
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this._handler = handler;
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this._cache = {
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// settingName: { roomId: value }
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};
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}
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getValue(settingName, roomId) {
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const cacheRoomId = roomId ? roomId : "UNDEFINED"; // avoid weird keys
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const bySetting = this._cache[settingName];
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if (bySetting && bySetting.hasOwnProperty(cacheRoomId)) {
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return bySetting[roomId];
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}
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return this._handler.getValue(settingName, roomId);
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}
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setValue(settingName, roomId, newValue) {
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if (!this._cache[settingName]) this._cache[settingName] = {};
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const bySetting = this._cache[settingName];
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const cacheRoomId = roomId ? roomId : "UNDEFINED"; // avoid weird keys
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bySetting[cacheRoomId] = newValue;
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return this._handler.setValue(settingName, roomId, newValue).finally(() => {
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delete bySetting[cacheRoomId];
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});
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}
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canSetValue(settingName, roomId) {
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return this._handler.canSetValue(settingName, roomId);
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}
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isSupported() {
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return this._handler.isSupported();
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}
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} |