merlimat commented on a change in pull request #1066: Issue 937: add
CommandGetLastMessageId to make reader know the end of topic
URL: https://github.com/apache/incubator-pulsar/pull/1066#discussion_r166478918
##########
File path:
pulsar-client/src/main/java/org/apache/pulsar/client/api/Consumer.java
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@@ -278,4 +277,18 @@
* @return a future to track the completion of the seek operation
*/
CompletableFuture<Void> seekAsync(MessageId messageId);
+
+ /**
+ * Check if there is message that has been published successfully to the
broker in the topic.
+ *
+ * Note: this operation can only be done on non-partitioned persistent
topics.
+ * For partitioned topics, one can rather perform the hasMessageAvailable
on the individual partitions.
+ */
+ Boolean hasMessageAvailable() throws PulsarClientException;
+
+ /**
+ * Asynchronously Check if there is message that has been published
successfully to the broker in the topic.
+ */
+ CompletableFuture<Boolean> hasMessageAvailableAsync();
Review comment:
I think this feature is mostly useful on the `Reader` interface. I think we
should hide it from here, at least until we can find a concrete use case for it.
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