Allow dead letter topics to be non-fully-qualified.

The consumer factories now respect the configured PulsarTopicBuilder and will fully-qualify the `deadLetterTopic` and `retryLetterTopic` on the `DeadLetterPolicy`. This allows users to not have to fully-qualify these topic names. Resolves #1241 Signed-off-by: Andrey Litvitski <andrey1010102008@gmail.com>

Author: therepanic

spring-pulsar-reactive/src/main/java/org/springframework/pulsar/reactive/core/DefaultReactivePulsarConsumerFactory.java

@@ -101,6 +101,18 @@ protected void ensureTopicNamesFullyQualified(ReactiveMessageConsumerBuilder<T>
 var fullyQualifiedTopics = topics.stream().map(this.topicBuilder::getFullyQualifiedNameForTopic).toList();
 mutableSpec.setTopicNames(fullyQualifiedTopics);
 }
+if (mutableSpec.getDeadLetterPolicy() != null) {
+var dlt = mutableSpec.getDeadLetterPolicy().getDeadLetterTopic();
+if (dlt != null) {
+mutableSpec.getDeadLetterPolicy()
+.setDeadLetterTopic(this.topicBuilder.getFullyQualifiedNameForTopic(dlt));
+}
+var rlt = mutableSpec.getDeadLetterPolicy().getRetryLetterTopic();
+if (rlt != null) {
+mutableSpec.getDeadLetterPolicy()
+.setRetryLetterTopic(this.topicBuilder.getFullyQualifiedNameForTopic(rlt));
+}
+}
 }
 
 protected void ensureTopicsPatternFullyQualified(ReactiveMessageConsumerBuilder<T> consumerBuilder) {

spring-pulsar/src/main/java/org/springframework/pulsar/core/DefaultPulsarConsumerFactory.java

@@ -149,6 +149,20 @@ protected void ensureTopicNamesFullyQualified(ConsumerBuilder<T> builder) {
 var fullyQualifiedTopics = topics.stream().map(this.topicBuilder::getFullyQualifiedNameForTopic).toList();
 builderImpl.getConf().setTopicNames(new HashSet<>(fullyQualifiedTopics));
 }
+if (builderImpl.getConf().getDeadLetterPolicy() != null) {
+var dlt = builderImpl.getConf().getDeadLetterPolicy().getDeadLetterTopic();
+if (dlt != null) {
+builderImpl.getConf()
+.getDeadLetterPolicy()
+.setDeadLetterTopic(this.topicBuilder.getFullyQualifiedNameForTopic(dlt));
+}
+var rlt = builderImpl.getConf().getDeadLetterPolicy().getRetryLetterTopic();
+if (rlt != null) {
+builderImpl.getConf()
+.getDeadLetterPolicy()
+.setRetryLetterTopic(this.topicBuilder.getFullyQualifiedNameForTopic(rlt));
+}
+}
 }
 
 protected void ensureTopicsPatternFullyQualified(ConsumerBuilder<T> builder) {