codelipenghui commented on a change in pull request #6362: [ClientAPI]Fix
hasMessageAvailable()
URL: https://github.com/apache/pulsar/pull/6362#discussion_r381346591
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File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java
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@@ -1412,6 +1424,51 @@ protected void
handleGetLastMessageId(CommandGetLastMessageId getLastMessageId)
}
}
+ private int getLargestBatchIndex(Topic topic, PositionImpl position, long
requestId) {
+ PersistentTopic persistentTopic = (PersistentTopic) topic;
+ ManagedLedgerImpl ml = (ManagedLedgerImpl)
persistentTopic.getManagedLedger();
+
+ CompletableFuture<Entry> entryFuture = new CompletableFuture<>();
+ ml.asyncReadEntry(position, new AsyncCallbacks.ReadEntryCallback() {
+ @Override
+ public void readEntryComplete(Entry entry, Object ctx) {
+ entryFuture.complete(entry);
+ }
+
+ @Override
+ public void readEntryFailed(ManagedLedgerException exception,
Object ctx) {
+ entryFuture.completeExceptionally(exception);
+ }
+ }, null);
+
+ CompletableFuture<Integer> batchSizeFuture =
entryFuture.thenApply(entry -> {
+ int[] sizeHolder = new int[1];
+ try {
+ MessageParser.parseMessage(TopicName.get(topic.getName()),
entry.getLedgerId(), entry.getEntryId(),
+ entry.getDataBuffer(), (message) -> {
+ sizeHolder[0] = ((RawMessageImpl)
message).getBatchSize();
+ message.release();
+ }, Commands.DEFAULT_MAX_MESSAGE_SIZE);
Review comment:
I think you can use`Commands.parseMessageMetadata(entry.getDataBuffer())` to
get the `MessageMetadata`. The batch size maintained in `MessageMetadata`.
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