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Posted to commits@pulsar.apache.org by GitBox <gi...@apache.org> on 2022/06/27 02:25:10 UTC
[GitHub] [pulsar] Technoboy- commented on a diff in pull request #16226: [improve][broker][PIP-149]make examineMessage method async
Technoboy- commented on code in PR #16226:
URL: https://github.com/apache/pulsar/pull/16226#discussion_r906923034
##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java:
##########
@@ -2851,58 +2851,77 @@ protected Response internalPeekNthMessage(String subName, int messagePosition, b
}
}
- protected Response internalExamineMessage(String initialPosition, long messagePosition, boolean authoritative) {
+ protected CompletableFuture<Response> internalExamineMessageAsync(String initialPosition, long messagePosition,
+ boolean authoritative) {
+ CompletableFuture<Void> ret;
if (topicName.isGlobal()) {
- validateGlobalNamespaceOwnership(namespaceName);
- }
-
- if (!topicName.isPartitioned() && getPartitionedTopicMetadata(topicName,
- authoritative, false).partitions > 0) {
- throw new RestException(Status.METHOD_NOT_ALLOWED,
- "Examine messages on a partitioned topic is not allowed, "
- + "please try examine message on specific topic partition");
- }
- validateTopicOwnership(topicName, authoritative);
- if (!(getTopicReference(topicName) instanceof PersistentTopic)) {
- log.error("[{}] Not supported operation of non-persistent topic {} ", clientAppId(), topicName);
- throw new RestException(Status.METHOD_NOT_ALLOWED,
- "Examine messages on a non-persistent topic is not allowed");
+ ret = validateGlobalNamespaceOwnershipAsync(namespaceName);
+ } else {
+ ret = CompletableFuture.completedFuture(null);
}
- if (messagePosition < 1) {
- messagePosition = 1;
+ long messagePositionLocal = messagePosition < 1 ? 1 : messagePosition;
+ String initialPositionLocal = initialPosition == null ? "latest" : initialPosition;
+ if (!topicName.isPartitioned()) {
+ ret = ret.thenCompose(__ -> getPartitionedTopicMetadataAsync(topicName, authoritative, false))
+ .thenCompose(partitionedTopicMetadata -> {
+ if (partitionedTopicMetadata.partitions > 0) {
+ throw new RestException(Status.METHOD_NOT_ALLOWED,
+ "Examine messages on a partitioned topic is not allowed, "
+ + "please try examine message on specific topic partition");
+ } else {
+ return CompletableFuture.completedFuture(null);
+ }
+ });
}
- if (null == initialPosition) {
- initialPosition = "latest";
- }
+ return ret.thenCompose(__ -> validateTopicOwnershipAsync(topicName, authoritative))
+ .thenCompose(__ -> getTopicReferenceAsync(topicName))
+ .thenCompose(topic -> {
+ if (!(topic instanceof PersistentTopic)) {
+ log.error("[{}] Not supported operation of non-persistent topic {} ", clientAppId(), topicName);
+ throw new RestException(Status.METHOD_NOT_ALLOWED,
+ "Examine messages on a non-persistent topic is not allowed");
+ }
+ try {
+ PersistentTopic persistentTopic = (PersistentTopic) topic;
+ long totalMessage = persistentTopic.getNumberOfEntries();
+ PositionImpl startPosition = persistentTopic.getFirstPosition();
+
+ long messageToSkip = initialPositionLocal.equals("earliest") ? messagePositionLocal :
+ totalMessage - messagePositionLocal + 1;
+ CompletableFuture<Entry> future = new CompletableFuture<>();
+ PositionImpl readPosition = persistentTopic.getPositionAfterN(startPosition, messageToSkip);
+ persistentTopic.asyncReadEntry(readPosition, new AsyncCallbacks.ReadEntryCallback() {
+ @Override
+ public void readEntryComplete(Entry entry, Object ctx) {
+ future.complete(entry);
+ }
- try {
- PersistentTopic topic = (PersistentTopic) getTopicReference(topicName);
- long totalMessage = topic.getNumberOfEntries();
- PositionImpl startPosition = topic.getFirstPosition();
- long messageToSkip =
- initialPosition.equals("earliest") ? messagePosition : totalMessage - messagePosition + 1;
- CompletableFuture<Entry> future = new CompletableFuture<>();
- PositionImpl readPosition = topic.getPositionAfterN(startPosition, messageToSkip);
- topic.asyncReadEntry(readPosition, new AsyncCallbacks.ReadEntryCallback() {
- @Override
- public void readEntryComplete(Entry entry, Object ctx) {
- future.complete(entry);
- }
+ @Override
+ public void readEntryFailed(ManagedLedgerException exception, Object ctx) {
+ future.completeExceptionally(exception);
+ }
+ }, null);
+ return future;
+ } catch (ManagedLedgerException exception) {
+ log.error("[{}] Failed to examine message at position {} from {} due to {}", clientAppId(),
+ messagePosition,
+ topicName, exception);
+ throw new RestException(exception);
+ }
- @Override
- public void readEntryFailed(ManagedLedgerException exception, Object ctx) {
- future.completeExceptionally(exception);
- }
- }, null);
- return generateResponseWithEntry(future.get());
- } catch (Exception exception) {
- exception.printStackTrace();
- log.error("[{}] Failed to examine message at position {} from {} due to {}", clientAppId(), messagePosition,
- topicName, exception);
- throw new RestException(exception);
- }
+ }).thenCompose(entry -> {
Review Comment:
`thenApply` is more better ?
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