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Convert WatchManager to TS

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This commit is contained in:
Travis Ralston 2020-07-28 15:40:24 -06:00
parent c96def81ae
commit d627baf508
1 changed files with 26 additions and 15 deletions
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41
src/settings/WatchManager.js → src/settings/WatchManager.ts
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@ -14,41 +14,52 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
import { SettingLevel } from "./SettingLevel";
export type CallbackFn = (changedInRoomId: string, atLevel: SettingLevel, newValAtLevel: any) => void;
const IRRELEVANT_ROOM: symbol = Symbol("any room");
interface RoomWatcherMap {
// @ts-ignore - TS wants string-only keys but we know better - https://github.com/Microsoft/TypeScript/issues/1863
[roomId: string | symbol]: CallbackFn[];
}
/**
* Generalized management class for dealing with watchers on a per-handler (per-level)
* basis without duplicating code. Handlers are expected to push updates through this
* class, which are then proxied outwards to any applicable watchers.
*/
export class WatchManager {
_watchers = {}; // { settingName: { roomId: callbackFns[] } }
private watchers: {[settingName: string]: RoomWatcherMap} = {};
// Proxy for handlers to delegate changes to this manager
watchSetting(settingName, roomId, cb) {
if (!this._watchers[settingName]) this._watchers[settingName] = {};
if (!this._watchers[settingName][roomId]) this._watchers[settingName][roomId] = [];
this._watchers[settingName][roomId].push(cb);
public watchSetting(settingName: string, roomId: string | null, cb: CallbackFn) {
if (!this.watchers[settingName]) this.watchers[settingName] = {};
if (!this.watchers[settingName][roomId]) this.watchers[settingName][roomId] = [];
this.watchers[settingName][roomId].push(cb);
}
// Proxy for handlers to delegate changes to this manager
unwatchSetting(cb) {
for (const settingName of Object.keys(this._watchers)) {
for (const roomId of Object.keys(this._watchers[settingName])) {
public unwatchSetting(cb: CallbackFn) {
for (const settingName of Object.keys(this.watchers)) {
for (const roomId of Object.keys(this.watchers[settingName])) {
let idx;
while ((idx = this._watchers[settingName][roomId].indexOf(cb)) !== -1) {
this._watchers[settingName][roomId].splice(idx, 1);
while ((idx = this.watchers[settingName][roomId].indexOf(cb)) !== -1) {
this.watchers[settingName][roomId].splice(idx, 1);
}
}
}
}
notifyUpdate(settingName, inRoomId, atLevel, newValueAtLevel) {
public notifyUpdate(settingName: string, inRoomId: string, atLevel: SettingLevel, newValueAtLevel: any) {
// Dev note: We could avoid raising changes for ultimately inconsequential changes, but
// we also don't have a reliable way to get the old value of a setting. Instead, we'll just
// let it fall through regardless and let the receiver dedupe if they want to.
if (!this._watchers[settingName]) return;
if (!this.watchers[settingName]) return;
const roomWatchers = this._watchers[settingName];
const roomWatchers = this.watchers[settingName];
const callbacks = [];
if (inRoomId !== null && roomWatchers[inRoomId]) {
@ -59,8 +70,8 @@ export class WatchManager {
// Fire updates to all the individual room watchers too, as they probably
// care about the change higher up.
callbacks.push(...Object.values(roomWatchers).reduce((r, a) => [...r, ...a], []));
} else if (roomWatchers[null]) {
callbacks.push(...roomWatchers[null]);
} else if (roomWatchers[IRRELEVANT_ROOM]) {
callbacks.push(...roomWatchers[IRRELEVANT_ROOM]);
}
for (const callback of callbacks) {