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https://issues.apache.org/jira/browse/KAFKA-8200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16826720#comment-16826720
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ASF GitHub Bot commented on KAFKA-8200:
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pkleindl commented on pull request #6556: KAFKA-8200: added Iterator methods
for output to TopologyTestDriver
URL: https://github.com/apache/kafka/pull/6556
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> TopologyTestDriver should offer an iterable signature of readOutput
> -------------------------------------------------------------------
>
> Key: KAFKA-8200
> URL: https://issues.apache.org/jira/browse/KAFKA-8200
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Michael Drogalis
> Assignee: Patrik Kleindl
> Priority: Minor
> Labels: needs-kip
>
> When using the TopologyTestDriver, one examines the output on a topic with
> the readOutput method. This method returns one record at a time, until no
> more records can be found, at which point in returns null.
> Many times, the usage pattern around readOutput will involve writing a loop
> to extract a number of records from the topic, building up a list of records,
> until it returns null.
> It would be helpful to offer an iterable signature of readOutput, which
> returns either an iterator or list over the records that are currently
> available in the topic. This would effectively remove the loop that a user
> needs to write for him/herself each time.
> Such a signature might look like:
> {code:java}
> public Iterable<ProducerRecord<byte[],byte[]>> readOutput(java.lang.String
> topic);
> {code}
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