58 lines
2.1 KiB
JavaScript
58 lines
2.1 KiB
JavaScript
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/*
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Copyright 2019 New Vector Ltd.
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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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/**
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* Generalized management class for dealing with watchers on a per-handler (per-level)
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* basis without duplicating code. Handlers are expected to push updates through this
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* class, which are then proxied outwards to any applicable watchers.
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*/
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export class WatchManager {
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_watchers = {}; // { settingName: { roomId: callbackFns[] } }
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// Proxy for handlers to delegate changes to this manager
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watchSetting(settingName, roomId, cb) {
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if (!this._watchers[settingName]) this._watchers[settingName] = {};
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if (!this._watchers[settingName][roomId]) this._watchers[settingName][roomId] = [];
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this._watchers[settingName][roomId].push(cb);
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}
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// Proxy for handlers to delegate changes to this manager
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unwatchSetting(cb) {
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for (const settingName of Object.keys(this._watchers)) {
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for (const roomId of Object.keys(this._watchers[settingName])) {
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let idx;
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while ((idx = this._watchers[settingName][roomId].indexOf(cb)) !== -1) {
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this._watchers[settingName][roomId].splice(idx, 1);
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}
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}
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}
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}
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notifyUpdate(settingName, inRoomId, newValue) {
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if (!this._watchers[settingName]) return;
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const roomWatchers = this._watchers[settingName];
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const callbacks = [];
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if (inRoomId !== null && roomWatchers[inRoomId]) callbacks.push(...roomWatchers[inRoomId]);
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if (roomWatchers[null]) callbacks.push(...roomWatchers[null]);
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for (const callback of callbacks) {
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callback(inRoomId, newValue);
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}
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}
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}
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