Customize Instantiation of KafkaStreams in StreamsBuilderFactoryBean #3515
Description
Context
We'd like to be able to customize the construction of the KafkaStreams instance when using the StreamsBuilderFactoryBean in order to add native spring-kafka support for Responsive and other potential drop in replacements for Kafka Streams.
I am happy to contribute this change.
Proposed API
We will extend KafkaStreamsCustomizer to include an initialization method:
public interface KafkaStreamsCustomizer {
// ...
default KafkaStreams initializeKafkaStreams(Topology topology, Properties properties, KafkaClientSupplier supplier) {
return new KafkaStreams(topology, properties, supplier);
}
}The StreamsBuilderFactoryBean will use this method when instantiating a new instance of KafkaStreams.
Example Usage
@Bean
public StreamsBuilderFactoryBeanConfigurer configurer() {
return fb -> fb.setKafkaStreamsCustomizer(new KafkaStreamsCustomizer() {
@Override KafkaStreams initializeKafkaStreams(Topology topology, Properties properties, KafkaClientSuppiler supplier) {
// note that ResponsiveKafkaStreams extends KafkaStreams so this is a drop-in replacement
return new ResponsiveKafkaStreams(topology, properties, supplier);
}
};
}