luoyuxia commented on a change in pull request #16417:
URL: https://github.com/apache/flink/pull/16417#discussion_r666018479
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File path:
flink-connectors/flink-connector-kafka/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/KafkaTopicsDescriptor.java
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@@ -41,17 +42,25 @@
private final Pattern topicPattern;
public KafkaTopicsDescriptor(
- @Nullable List<String> fixedTopics, @Nullable Pattern
topicPattern) {
+ @Nullable List<String> fixedTopics, @Nullable Pattern topicPattern) {
checkArgument(
- (fixedTopics != null && topicPattern == null)
- || (fixedTopics == null && topicPattern != null),
- "Exactly one of either fixedTopics or topicPattern must be
specified.");
+ (fixedTopics != null && topicPattern == null)
+ || (fixedTopics == null && topicPattern != null),
+ "Exactly one of either fixedTopics or topicPattern must be
specified.");
if (fixedTopics != null) {
checkArgument(
- !fixedTopics.isEmpty(),
- "If subscribing to a fixed topics list, the supplied list
cannot be empty.");
+ !fixedTopics.isEmpty(),
+ "If subscribing to a fixed topics list, the supplied list
cannot be empty.");
+ fixedTopics.forEach(topic -> {
+ checkNotNull(topic, "An null topic exists in the subscribed
topics list.");
+ checkArgument(!"".equals(topic), "An empty topic exists in the
subscribed topics list.");
+ });
}
+ if (topicPattern != null) {
Review comment:
It's no need to check topicPattern is empty or not, it's legal if
topicPattern is empty.
we can just delete the statement 'if (topicPattern != null) { ... }'.
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