66 lines
2.1 KiB
JavaScript
66 lines
2.1 KiB
JavaScript
import { SortedArray, MappedList, ConcatList } from "../../../observable/index.js";
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import Direction from "./Direction.js";
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import TimelineReader from "./persistence/TimelineReader.js";
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import PendingEventEntry from "./entries/PendingEventEntry.js";
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export default class Timeline {
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constructor({roomId, storage, closeCallback, fragmentIdComparer, pendingEvents, user}) {
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this._roomId = roomId;
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this._storage = storage;
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this._closeCallback = closeCallback;
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this._fragmentIdComparer = fragmentIdComparer;
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this._remoteEntries = new SortedArray((a, b) => a.compare(b));
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this._timelineReader = new TimelineReader({
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roomId: this._roomId,
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storage: this._storage,
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fragmentIdComparer: this._fragmentIdComparer
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});
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const localEntries = new MappedList(pendingEvents, pe => {
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return new PendingEventEntry({pendingEvent: pe, user});
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}, (pee, params) => {
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pee.notifyUpdate(params);
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});
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this._allEntries = new ConcatList(this._remoteEntries, localEntries);
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}
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/** @package */
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async load() {
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const entries = await this._timelineReader.readFromEnd(50);
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this._remoteEntries.setManySorted(entries);
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}
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/** @package */
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appendLiveEntries(newEntries) {
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this._remoteEntries.setManySorted(newEntries);
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}
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/** @package */
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addGapEntries(newEntries) {
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this._remoteEntries.setManySorted(newEntries);
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}
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// tries to prepend `amount` entries to the `entries` list.
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async loadAtTop(amount) {
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const firstEventEntry = this._remoteEntries.array.find(e => !!e.eventType);
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if (!firstEventEntry) {
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return;
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}
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const entries = await this._timelineReader.readFrom(
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firstEventEntry.asEventKey(),
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Direction.Backward,
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amount
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);
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this._remoteEntries.setManySorted(entries);
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}
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/** @public */
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get entries() {
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return this._allEntries;
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}
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/** @public */
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close() {
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this._closeCallback();
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}
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}
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