BewareMyPower commented on code in PR #16969:
URL: https://github.com/apache/pulsar/pull/16969#discussion_r954736387
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pulsar-client-cpp/lib/MultiTopicsConsumerImpl.cc:
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@@ -125,33 +133,39 @@ Future<Result, Consumer>
MultiTopicsConsumerImpl::subscribeOneTopicAsync(const s
}
// subscribe for each partition, when all partitions completed, complete
promise
-
lookupServicePtr_->getPartitionMetadataAsync(topicName).addListener(std::bind(
- &MultiTopicsConsumerImpl::subscribeTopicPartitions,
shared_from_this(), std::placeholders::_1,
- std::placeholders::_2, topicName, subscriptionName_, conf_,
topicPromise));
+ Lock lock(mutex_);
+ auto entry = topicsPartitions_.find(topic);
+ if (entry == topicsPartitions_.end()) {
+ lock.unlock();
+ lookupServicePtr_->getPartitionMetadataAsync(topicName).addListener(
+ [this, topicName, topicPromise](const Result result, const
LookupDataResultPtr lookupDataResult) {
Review Comment:
```suggestion
[this, topicName, topicPromise](Result result, const
LookupDataResultPtr& lookupDataResult) {
```
The listener's function signature is `std::function<Result, const T&>`.
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