X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fpersistence%2Fkafka%2FKafkaChatHomeService.java;h=38aecd187e246ea906e9bb228b8e69cd00a1214c;hb=13c51b4630177e7f6649500a3d4b876a12509af6;hp=e23f08db4677975bac0f5fcbf286a3278ec5d099;hpb=9aaca321143c4fd08859dc14cdd7e602cc1714f6;p=demos%2Fkafka%2Fchat

diff --git a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java
index e23f08db..38aecd18 100644
--- a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatHomeService.java
@@ -2,281 +2,50 @@ package de.juplo.kafka.chat.backend.persistence.kafka;
 
 import de.juplo.kafka.chat.backend.domain.ChatHomeService;
 import de.juplo.kafka.chat.backend.domain.ChatRoom;
-import de.juplo.kafka.chat.backend.domain.Message;
 import de.juplo.kafka.chat.backend.domain.ShardNotOwnedException;
-import de.juplo.kafka.chat.backend.persistence.KafkaLikeShardingStrategy;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
-import org.apache.kafka.clients.consumer.ConsumerRecord;
-import org.apache.kafka.clients.consumer.ConsumerRecords;
-import org.apache.kafka.clients.producer.Producer;
-import org.apache.kafka.clients.producer.ProducerRecord;
-import org.apache.kafka.common.TopicPartition;
-import org.apache.kafka.common.errors.RecordDeserializationException;
-import org.apache.kafka.common.errors.WakeupException;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
-import java.time.*;
 import java.util.*;
-import java.util.stream.IntStream;
 
 
 @Slf4j
-public class KafkaChatHomeService implements ChatHomeService, Runnable, ConsumerRebalanceListener
+public class KafkaChatHomeService implements ChatHomeService
 {
-  private final String chatRoomsTopic;
-  private final Consumer<Integer, ChatRoomTo> chatRoomsConsumer;
-  private final Producer<Integer, ChatRoomTo> chatRoomsProducer;
-  private final String chatMessagesTopic;
-  private final Consumer<String, MessageTo> chatMessagesConsumer;
-  private final Producer<String, MessageTo> chatMessagesProducer;
-  private final ZoneId zoneId;
-  private final int numShards;
-  private final boolean[] isShardOwned;
-  private final long[] currentOffset;
-  private final long[] nextOffset;
-  private final Map<UUID, ChatRoom>[] chatrooms;
-  private final KafkaLikeShardingStrategy shardingStrategy;
+  private final ChatMessageChannel chatMessageChanel;
 
-  private boolean running;
-  private volatile boolean loadInProgress;
 
-
-  public KafkaChatHomeService(
-    String chatRoomsTopic,
-    Consumer<Integer, ChatRoomTo> chatRoomsConsumer,
-    Producer<Integer, ChatRoomTo> chatRoomsProducer,
-    String chatMessagesTopic,
-    Consumer<String, MessageTo> chatMessagesConsumer,
-    Producer<String, MessageTo> chatMessagesProducer,
-    ZoneId zoneId,
-    int numShards)
+  public KafkaChatHomeService(ChatMessageChannel chatMessageChannel)
   {
     log.debug("Creating KafkaChatHomeService");
-    this.chatRoomsTopic = chatRoomsTopic;
-    this.chatRoomsConsumer = chatRoomsConsumer;
-    this.chatRoomsProducer = chatRoomsProducer;
-    this.chatMessagesTopic = chatMessagesTopic;
-    this.chatMessagesConsumer = chatMessagesConsumer;
-    this.chatMessagesProducer = chatMessagesProducer;
-    this.zoneId = zoneId;
-    this.numShards = numShards;
-    this.isShardOwned = new boolean[numShards];
-    this.currentOffset = new long[numShards];
-    this.nextOffset = new long[numShards];
-    this.chatrooms = new Map[numShards];
-    this.shardingStrategy = new KafkaLikeShardingStrategy(numShards);
-  }
-
-
-  @Override
-  public void onPartitionsAssigned(Collection<TopicPartition> partitions)
-  {
-    log.info("Newly assigned partitions! Pausing normal operations...");
-    loadInProgress = true;
-
-    chatMessagesConsumer.endOffsets(partitions).forEach((topicPartition, currentOffset) ->
-    {
-      int partition = topicPartition.partition();
-      isShardOwned[partition] =  true;
-      this.currentOffset[partition] = currentOffset;
-
-      log.info(
-          "Partition assigned: {} - loading messages: next={} -> current={}",
-          partition,
-          nextOffset[partition],
-          currentOffset);
-
-      chatMessagesConsumer.seek(topicPartition, nextOffset[partition]);
-    });
-
-    chatMessagesConsumer.resume(partitions);
-  }
-
-  @Override
-  public void onPartitionsRevoked(Collection<TopicPartition> partitions)
-  {
-    partitions.forEach(topicPartition ->
-    {
-      int partition = topicPartition.partition();
-      isShardOwned[partition] = false;
-      log.info("Partition revoked: {} - next={}", partition, nextOffset[partition]);
-    });
+    this.chatMessageChanel = chatMessageChannel;
   }
 
-  @Override
-  public void onPartitionsLost(Collection<TopicPartition> partitions)
-  {
-    log.warn("Lost partitions: {}, partitions");
-    // TODO: Muss auf den Verlust anders reagiert werden?
-    onPartitionsRevoked(partitions);
-  }
-
-  @Override
-  public void run()
-  {
-    chatMessagesConsumer.subscribe(List.of(chatMessagesTopic));
-
-    running = true;
-
-    while (running)
-    {
-      try
-      {
-        ConsumerRecords<String, MessageTo> records = chatMessagesConsumer.poll(Duration.ofMinutes(5));
-        log.info("Fetched {} messages", records.count());
-
-        if (loadInProgress)
-        {
-          loadMessages(records);
-
-          if (isLoadingCompleted())
-          {
-            log.info("Loading of messages completed! Pausing all owned partitions...");
-            pauseAllOwnedPartions();
-            log.info("Resuming normal operations...");
-            loadInProgress = false;
-          }
-        }
-        else
-        {
-          if (!records.isEmpty())
-          {
-            throw new IllegalStateException("All owned partitions should be paused, when no load is in progress!");
-          }
-        }
-      }
-      catch (WakeupException e)
-      {
-      }
-      catch (RecordDeserializationException e)
-      {
-      }
-    }
-  }
-
-  void loadMessages(ConsumerRecords<String, MessageTo> records)
-  {
-    for (ConsumerRecord<String, MessageTo> record : records)
-    {
-      nextOffset[record.partition()] = record.offset() + 1;
-      UUID chatRoomId = UUID.fromString(record.key());
-      MessageTo messageTo = record.value();
-
-      Message.MessageKey key = Message.MessageKey.of(messageTo.getUser(), messageTo.getId());
-
-      Instant instant = Instant.ofEpochSecond(record.timestamp());
-      LocalDateTime timestamp = LocalDateTime.ofInstant(instant, zoneId);
-
-      Message message = new Message(key, record.offset(), timestamp, messageTo.getText());
-
-      ChatRoom chatRoom = chatrooms[record.partition()].get(chatRoomId);
-      KafkaChatRoomService kafkaChatRoomService =
-          (KafkaChatRoomService) chatRoom.getChatRoomService();
-
-      kafkaChatRoomService.persistMessage(message);
-    }
-  }
-
-  boolean isLoadingCompleted()
-  {
-    return IntStream
-        .range(0, numShards)
-        .filter(shard -> isShardOwned[shard])
-        .mapToObj(shard -> nextOffset[shard] >= currentOffset[shard])
-        .collect(
-            () -> Boolean.TRUE,
-            (acc, v) -> Boolean.valueOf(acc && v),
-            (a, b) -> Boolean.valueOf(a && b));
-  }
-
-  void pauseAllOwnedPartions()
-  {
-    chatMessagesConsumer.pause(IntStream
-        .range(0, numShards)
-        .filter(shard -> isShardOwned[shard])
-        .mapToObj(shard -> new TopicPartition(chatMessagesTopic, shard))
-        .toList());
-  }
-
-  Mono<Message> sendMessage(
-      UUID chatRoomId,
-      Message.MessageKey key,
-      LocalDateTime timestamp,
-      String text)
-  {
-    int shard = this.shardingStrategy.selectShard(chatRoomId);
-    TopicPartition tp = new TopicPartition(chatMessagesTopic, shard);
-    ZonedDateTime zdt = ZonedDateTime.of(timestamp, zoneId);
-    return Mono.create(sink ->
-    {
-      ProducerRecord<String, MessageTo> record =
-          new ProducerRecord<>(
-              tp.topic(),
-              tp.partition(),
-              zdt.toEpochSecond(),
-              chatRoomId.toString(),
-              MessageTo.of(key.getUsername(), key.getMessageId(), text));
-
-      chatMessagesProducer.send(record, ((metadata, exception) ->
-      {
-        if (metadata != null)
-        {
-          // On successful send
-          Message message = new Message(key, metadata.offset(), timestamp, text);
-          log.info("Successfully send message {}", message);
-          sink.success(message);
-        }
-        else
-        {
-          // On send-failure
-          log.error(
-              "Could not send message for chat-room={}, key={}, timestamp={}, text={}: {}",
-              chatRoomId,
-              key,
-              timestamp,
-              text,
-              exception);
-          sink.error(exception);
-        }
-      }));
-    });
-  }
-
-
-  public void putChatRoom(ChatRoom chatRoom)
-  {
-
-    ProducerRecord<Integer, ChatRoomTo> record = new ProducerRecord<>(chatRoom.getShard(), );
-    // TODO: Nachricht senden!
-    chatrooms[chatRoom.getShard()].put(chatRoom.getId(), chatRoom);
-  }
 
   @Override
   public Mono<ChatRoom> getChatRoom(int shard, UUID id)
   {
-    if (loadInProgress)
+    if (chatMessageChanel.isLoadInProgress())
     {
       throw new ShardNotOwnedException(shard);
     }
     else
     {
-      return Mono.justOrEmpty(chatrooms[shard].get(id));
+      return chatMessageChanel.getChatRoom(shard, id);
     }
   }
 
   @Override
   public Flux<ChatRoom> getChatRooms(int shard)
   {
-    if (loadInProgress)
+    if (chatMessageChanel.isLoadInProgress())
     {
       throw new ShardNotOwnedException(shard);
     }
     else
     {
-      return Flux.fromStream(chatrooms[shard].values().stream());
+      return chatMessageChanel.getChatRooms(shard);
     }
   }
 }