e5d4916a4d
Kafka Binder-based Batch Producer and Consumer - Provide a new sample for batch producer and consumer with the Kafka binder
69 lines
2.0 KiB
Java
69 lines
2.0 KiB
Java
/*
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* Copyright 2023 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package sample.stream.batch;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.context.annotation.Bean;
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import org.springframework.kafka.annotation.KafkaListener;
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import org.springframework.messaging.Message;
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import org.springframework.messaging.support.MessageBuilder;
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import java.util.List;
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import java.util.UUID;
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import java.util.function.Function;
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import java.util.function.Supplier;
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/**
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* @author Steven Gantz
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*/
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@SpringBootApplication
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public class CloudStreamsFunctionBatch {
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public static void main(String[] args) {
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SpringApplication.run(CloudStreamsFunctionBatch.class, args);
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}
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@Bean
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public Supplier<UUID> stringSupplier() {
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return () -> {
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var uuid = UUID.randomUUID();
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System.out.println(uuid + " -> batch-in");
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return uuid;
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};
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}
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@Bean
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public Function<List<UUID>, List<Message<String>>> digitRemovingConsumer() {
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return idBatch -> {
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System.out.println("Removed digits from batch of " + idBatch.size());
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return idBatch.stream()
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.map(UUID::toString)
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// Remove all digits from the UUID
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.map(uuid -> uuid.replaceAll("\\d",""))
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.map(noDigitString -> MessageBuilder.withPayload(noDigitString).build())
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.toList();
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};
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}
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@KafkaListener(id = "batch-out", topics = "batch-out")
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public void listen(String in) {
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System.out.println("batch-out -> " + in);
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}
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}
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