76 lines
2.3 KiB
Java
76 lines
2.3 KiB
Java
package com.baeldung.spring.kafka;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Value;
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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.ConfigurableApplicationContext;
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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.kafka.core.KafkaTemplate;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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@SpringBootApplication
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public class KafkaApplicationLongMessage {
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public static void main(String[] args) throws Exception {
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ConfigurableApplicationContext context = SpringApplication.run(KafkaApplicationLongMessage.class, args);
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LongMessageProducer producer = context.getBean(LongMessageProducer.class);
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String fileData = readLongMessage();
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producer.sendMessage(fileData);
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//Deliberate delay to let listener consume produced message before main thread stops
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Thread.sleep(5000);
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context.close();
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}
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private static String readLongMessage() throws IOException {
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String data = "";
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//update complete location of large message here
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data = new String(Files.readAllBytes(Paths.get("RandomTextFile.txt")));
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return data;
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}
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@Bean
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public LongMessageProducer longMessageProducer() {
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return new LongMessageProducer();
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}
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@Bean
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public LongMessageListener longMessageListener() {
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return new LongMessageListener();
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}
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public static class LongMessageProducer {
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@Autowired
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private KafkaTemplate<String, String> kafkaTemplate;
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@Value(value = "${long.message.topic.name}")
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private String topicName;
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public void sendMessage(String message) {
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kafkaTemplate.send(topicName, message);
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System.out.println("Long message Sent");
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}
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}
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public static class LongMessageListener {
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@KafkaListener(topics = "${long.message.topic.name}", groupId = "longMessage", containerFactory = "longMessageKafkaListenerContainerFactory")
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public void listenGroupLongMessage(String message) {
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System.out.println("Received Message in group 'longMessage'");
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}
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}
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}
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