1 package de.juplo.kafka.chat.backend.persistence.kafka;
3 import de.juplo.kafka.chat.backend.ChatBackendProperties;
4 import de.juplo.kafka.chat.backend.persistence.kafka.messages.AbstractMessageTo;
5 import jakarta.annotation.PreDestroy;
6 import lombok.extern.slf4j.Slf4j;
7 import org.apache.kafka.clients.consumer.Consumer;
8 import org.springframework.beans.factory.annotation.Autowired;
9 import org.springframework.boot.ApplicationArguments;
10 import org.springframework.boot.ApplicationRunner;
11 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
12 import org.springframework.context.ConfigurableApplicationContext;
13 import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
14 import org.springframework.stereotype.Component;
16 import java.util.List;
17 import java.util.concurrent.CompletableFuture;
20 @ConditionalOnProperty(
21 prefix = "chat.backend",
23 havingValue = "kafka")
26 public class KafkaServicesApplicationRunner implements ApplicationRunner
29 ChatBackendProperties properties;
32 ThreadPoolTaskExecutor taskExecutor;
34 ConfigurableApplicationContext context;
37 ChatRoomChannel chatRoomChannel;
39 Consumer<String, AbstractMessageTo> chatRoomChannelConsumer;
41 CompletableFuture<Void> chatRoomChannelConsumerJob;
45 public void run(ApplicationArguments args) throws Exception
47 List<String> topics = List.of(properties.getKafka().getChatRoomChannelTopic());
48 chatRoomChannelConsumer.subscribe(topics, chatRoomChannel);
49 log.info("Starting the consumer for the ChatRoomChannel");
50 chatRoomChannelConsumerJob = taskExecutor
51 .submitCompletable(chatRoomChannel)
54 log.error("The consumer for the ChatRoomChannel exited abnormally!", e);
60 public void joinChatRoomChannelConsumerJob()
62 log.info("Signaling the consumer of the CahtRoomChannel to quit its work");
63 chatRoomChannelConsumer.wakeup();
64 log.info("Waiting for the consumer of the ChatRoomChannel to finish its work");
65 chatRoomChannelConsumerJob.join();
66 log.info("Joined the consumer of the ChatRoomChannel");