mattisonchao commented on code in PR #21208:
URL: https://github.com/apache/pulsar/pull/21208#discussion_r1360239325
##########
pulsar-broker/src/main/java/org/apache/pulsar/compaction/PulsarTopicCompactionService.java:
##########
@@ -106,6 +111,78 @@ public CompletableFuture<Position>
getLastCompactedPosition() {
return
CompletableFuture.completedFuture(compactedTopic.getCompactionHorizon().orElse(null));
}
+ @Override
+ public CompletableFuture<Entry> findEntryByPublishTime(long publishTime) {
+ final Predicate<Entry> predicate = entry -> {
+ try {
+ return
Commands.parseMessageMetadata(entry.getDataBuffer()).getPublishTime() >=
publishTime;
+ } finally {
+ entry.release();
+ }
+ };
+ return findFirstMatchEntry(predicate);
+ }
+
+ @Override
+ public CompletableFuture<Entry> findEntryByEntryIndex(long entryIndex) {
+ final Predicate<Entry> predicate = entry -> {
+ try {
+ BrokerEntryMetadata brokerEntryMetadata =
+
Commands.parseBrokerEntryMetadataIfExist(entry.getDataBuffer());
+ if (brokerEntryMetadata == null ||
!brokerEntryMetadata.hasIndex()) {
+ return false;
+ }
+ return brokerEntryMetadata.getIndex() >= entryIndex;
+ } finally {
+ entry.release();
+ }
+ };
+ return findFirstMatchEntry(predicate);
+ }
+
+ private CompletableFuture<Entry> findFirstMatchEntry(final
Predicate<Entry> predicate) {
+ var compactedTopicContextFuture =
compactedTopic.getCompactedTopicContextFuture();
+
+ if (compactedTopicContextFuture == null) {
+ return CompletableFuture.completedFuture(null);
+ }
+ return compactedTopicContextFuture.thenCompose(compactedTopicContext
-> {
+ LedgerHandle lh = compactedTopicContext.getLedger();
+ CompletableFuture<Long> promise = new CompletableFuture<>();
+ findFirstMatchIndexLoop(predicate, 0L, lh.getLastAddConfirmed(),
promise, null, lh);
+ return promise.thenCompose(index -> {
+ if (index == null) {
+ return CompletableFuture.completedFuture(null);
+ }
+ return readEntries(lh, index, index).thenApply(entries ->
entries.get(0));
+ });
+ });
+ }
+
+ private static void findFirstMatchIndexLoop(final Predicate<Entry>
predicate,
+ final long start, final long end,
+ final CompletableFuture<Long>
promise,
+ final Long lastMatchIndex,
+ final LedgerHandle lh) {
+ if (start > end) {
+ promise.complete(lastMatchIndex);
+ return;
+ }
+
+ long mid = (start + end) / 2;
+ CompactedTopicImpl.readEntries(lh, mid, mid).thenAccept(entries -> {
+ Entry entry = entries.get(0);
+ if (predicate.test(entry)) {
+ findFirstMatchIndexLoop(predicate, start, mid - 1, promise,
mid, lh);
Review Comment:
Got it. thanks!
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