sijie commented on a change in pull request #6331: [Issue 2912][pulsar-admin]
add get-message-by-id cmd into pulsar-admin
URL: https://github.com/apache/pulsar/pull/6331#discussion_r380011558
##########
File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java
##########
@@ -1403,21 +1404,51 @@ protected void internalResetCursorOnPosition(String
subName, boolean authoritati
}
}
- protected Response internalPeekNthMessage(String subName, int
messagePosition, boolean authoritative) {
- if (topicName.isGlobal()) {
- validateGlobalNamespaceOwnership(namespaceName);
- }
- PartitionedTopicMetadata partitionMetadata =
getPartitionedTopicMetadata(topicName, authoritative, false);
- if (partitionMetadata.partitions > 0) {
- throw new RestException(Status.METHOD_NOT_ALLOWED, "Peek messages
on a partitioned topic is not allowed");
+ protected Response internalGetMessageById(long ledgerId, long entryId,
boolean authoritative) {
+ verifyReadOperation(authoritative);
+
+ PersistentTopic topic = (PersistentTopic) getTopicReference(topicName);
+ ManagedLedgerImpl ledger = (ManagedLedgerImpl)
topic.getManagedLedger();
+ Entry entry = null;
+ try {
+ CompletableFuture<Entry> future = new CompletableFuture<>();
+ ledger.asyncReadEntry(new PositionImpl(ledgerId, entryId), new
AsyncCallbacks.ReadEntryCallback() {
+ @Override
+ public void readEntryFailed(ManagedLedgerException exception,
Object ctx) {
+ future.completeExceptionally(exception);
+ }
+
+ @Override
+ public void readEntryComplete(Entry entry, Object ctx) {
+ future.complete(entry);
+ }
+ }, null);
+
+ entry = future.get(1000, TimeUnit.MILLISECONDS);
Review comment:
Sorry for being late in reviewing this pull request. I would suggest
implementing this using AsyncResponse. We have tried to move away from using
sync methods.
You can check `internalCreateSubscription` on how to use AsyncResponse.
https://github.com/apache/pulsar/blob/df152109415f2b10dd83e8afe50d9db7ab7cbad5/pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java#L1305
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