yuruguo commented on a change in pull request #12961:
URL: https://github.com/apache/pulsar/pull/12961#discussion_r756174863
##########
File path:
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java
##########
@@ -3218,7 +3219,7 @@ public boolean checkSubscriptionTypesEnable(SubType
subType) throws Exception {
if (topicPolicies == null) {
return checkNsAndBrokerSubscriptionTypesEnable(topicName,
subType);
} else {
- if (topicPolicies.getSubscriptionTypesEnabled().isEmpty())
{
+ if
(CollectionUtils.isEmpty(topicPolicies.getSubscriptionTypesEnabled())) {
Review comment:
`topicPolicies.getSubscriptionTypesEnabled()` default value is `empty
list`, when can it become `null`?
https://github.com/apache/pulsar/blob/94736a43f1b9a6d1db75936032b94eb9a11b9c0d/pulsar-common/src/main/java/org/apache/pulsar/common/policies/data/TopicPolicies.java#L47-L48
In addition, it is recommended to combine the two judgments as below:
```
if (topicPolicies == null ||
CollectionUtils.isEmpty(topicPolicies.getSubscriptionTypesEnabled())) {
return checkNsAndBrokerSubscriptionTypesEnable(topicName, subType);
} else {
return topicPolicies.getSubscriptionTypesEnabled().contains(subType);
}
```
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