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process in incoming order (reverse-chronological order if backward)

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makes code simpler, don't need fix to undo reverse ordering of
nonOverlappingEvents. reverse looking is very likely premature
optimization as well.
This commit is contained in:
Bruno Windels 2019-06-03 00:18:52 +02:00
parent 0407829b26
commit 3dbf5e727d
2 changed files with 7 additions and 19 deletions
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16
src/matrix/room/timeline/persistence/GapWriter.js
View file

@ -10,28 +10,18 @@ export default class GapWriter {
}
// events is in reverse-chronological order (last event comes at index 0) if backwards
async _findOverlappingEvents(fragmentEntry, events, txn) {
const {direction} = fragmentEntry;
// make it in chronological order, so findFirstOrLastOccurringEventId can
// use it's supposed optimization if event ids sorting order correlates with timeline chronology.
// premature optimization?
if (direction.isBackward) {
events = events.slice().reverse();
}
const eventIds = events.map(e => e.event_id);
const findLast = direction.isBackward;
let nonOverlappingEvents = events;
let neighbourFragmentEntry;
const neighbourEventId = await txn.timelineEvents.findFirstOrLastOccurringEventId(this._roomId, eventIds, findLast);
const neighbourEventId = await txn.timelineEvents.findFirstOccurringEventId(this._roomId, eventIds);
if (neighbourEventId) {
console.log("_findOverlappingEvents neighbourEventId", neighbourEventId);
// trim overlapping events
const neighbourEventIndex = events.findIndex(e => e.event_id === neighbourEventId);
const start = direction.isBackward ? neighbourEventIndex + 1 : 0;
const end = direction.isBackward ? events.length : neighbourEventIndex;
nonOverlappingEvents = events.slice(start, end);
nonOverlappingEvents = events.slice(0, neighbourEventIndex);
// get neighbour fragment to link it up later on
const neighbourEvent = await txn.timelineEvents.getByEventId(this._roomId, neighbourEventId);
console.log("neighbourEvent", {neighbourEvent, start, end, nonOverlappingEvents, events, neighbourEventIndex});
console.log("neighbourEvent", {neighbourEvent, nonOverlappingEvents, events, neighbourEventIndex});
const neighbourFragment = await txn.timelineFragments.get(this._roomId, neighbourEvent.fragmentId);
neighbourFragmentEntry = fragmentEntry.createNeighbourEntry(neighbourFragment);
}

10
src/matrix/storage/idb/stores/TimelineEventStore.js
View file

@ -153,7 +153,7 @@ export default class TimelineEventStore {
return events;
}
/** Finds the first (or last if `findLast=true`) eventId that occurs in the store, if any.
/** Finds the first eventId that occurs in the store, if any.
* For optimal performance, `eventIds` should be in chronological order.
*
* The order in which results are returned might be different than `eventIds`.
@ -167,7 +167,7 @@ export default class TimelineEventStore {
// In that case we could avoid running over all eventIds, as the reported order by findExistingKeys
// would match the order of eventIds. That's why findLast is also passed as backwards to keysExist.
// also passing them in chronological order makes sense as that's how we'll receive them almost always.
async findFirstOrLastOccurringEventId(roomId, eventIds, findLast = false) {
async findFirstOccurringEventId(roomId, eventIds) {
const byEventId = this._timelineStore.index("byEventId");
const keys = eventIds.map(eventId => [roomId, eventId]);
const results = new Array(keys.length);
@ -175,9 +175,7 @@ export default class TimelineEventStore {
// find first result that is found and has no undefined results before it
function firstFoundAndPrecedingResolved() {
let inc = findLast ? -1 : 1;
let start = findLast ? results.length - 1 : 0;
for(let i = start; i >= 0 && i < results.length; i += inc) {
for(let i = 0; i < results.length; ++i) {
if (results[i] === undefined) {
return;
} else if(results[i] === true) {
@ -186,7 +184,7 @@ export default class TimelineEventStore {
}
}
await byEventId.findExistingKeys(keys, findLast, (key, found) => {
await byEventId.findExistingKeys(keys, false, (key, found) => {
const index = keys.indexOf(key);
results[index] = found;
firstFoundKey = firstFoundAndPrecedingResolved();