1 package de.juplo.kafka.chat.backend.persistence.kafka;
3 import de.juplo.kafka.chat.backend.domain.*;
4 import lombok.RequiredArgsConstructor;
5 import lombok.extern.slf4j.Slf4j;
6 import org.apache.kafka.clients.consumer.Consumer;
7 import org.apache.kafka.clients.consumer.ConsumerRecord;
8 import org.apache.kafka.clients.consumer.ConsumerRecords;
9 import org.apache.kafka.clients.producer.Producer;
10 import org.apache.kafka.clients.producer.ProducerRecord;
11 import org.apache.kafka.common.TopicPartition;
12 import org.apache.kafka.common.errors.RecordDeserializationException;
13 import org.apache.kafka.common.errors.WakeupException;
14 import reactor.core.publisher.Mono;
17 import java.util.List;
18 import java.util.UUID;
21 @RequiredArgsConstructor
23 public class ChatRoomChannel implements Runnable
25 private final String topic;
26 private final Consumer<Integer, ChatRoomTo> consumer;
27 private final Producer<Integer, ChatRoomTo> producer;
28 private final ShardingStrategy shardingStrategy;
29 private final ChatMessageChannel chatMessageChannel;
30 private final Clock clock;
31 private final int bufferSize;
33 private boolean running;
36 Mono<ChatRoomInfo> sendCreateChatRoomRequest(
40 int shard = this.shardingStrategy.selectShard(chatRoomId);
41 ChatRoomTo chatRoomTo = ChatRoomTo.of(chatRoomId, name, shard);
42 return Mono.create(sink ->
44 ProducerRecord<Integer, ChatRoomTo> record =
50 producer.send(record, ((metadata, exception) ->
54 log.info("Successfully send chreate-request for chat room: {}", chatRoomTo);
55 sink.success(chatRoomTo.toChatRoomInfo());
61 "Could not send create-request for chat room (id={}, name={}): {}",
65 sink.error(exception);
74 consumer.assign(List.of(new TopicPartition(topic, 0)));
82 ConsumerRecords<Integer, ChatRoomTo> records = consumer.poll(Duration.ofMinutes(5));
83 log.info("Fetched {} messages", records.count());
85 for (ConsumerRecord<Integer, ChatRoomTo> record : records)
87 createChatRoom(record.value().toChatRoomInfo());
90 catch (WakeupException e)
92 log.info("Received WakeupException, exiting!");
98 void createChatRoom(ChatRoomInfo chatRoomInfo)
100 UUID id = chatRoomInfo.getId();
101 String name = chatRoomInfo.getName();
102 int shard = chatRoomInfo.getShard();
103 log.info("Creating ChatRoom {} with buffer-size {}", id, bufferSize);
104 KafkaChatRoomService service = new KafkaChatRoomService(chatMessageChannel, id);
105 ChatRoom chatRoom = new ChatRoom(id, name, shard, clock, service, bufferSize);
106 chatMessageChannel.putChatRoom(chatRoom);