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=df2360875c75f25798f2f55d1e77fc8d46cc31b0;hp=4fa567ceb1eba8df36b4c050b9e105eee4a6d29e;hpb=ba3aba8860f41fcc54970d5e234fee0576768c98;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 4fa567ce..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
@@ -2,12 +2,8 @@ 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 lombok.RequiredArgsConstructor;
+import de.juplo.kafka.chat.backend.domain.ShardNotOwnedException;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
-import org.apache.kafka.common.TopicPartition;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
@@ -15,168 +11,41 @@ import java.util.*;
 
 
 @Slf4j
-public class KafkaChatHomeService implements ChatHomeService, ConsumerRebalanceListener
+public class KafkaChatHomeService implements ChatHomeService
 {
-  private final Consumer<String, MessageTo> consumer;
-  private final String topic;
-  private final long[] offsets;
-  private final MessageHandler[] handlers;
-  private final Map<UUID, ChatRoom>[] chatrooms;
+  private final ChatMessageChannel chatMessageChanel;
 
 
-  public KafkaChatHomeService(
-    Consumer<String, MessageTo> consumer,
-    String topic,
-    int numShards)
+  public KafkaChatHomeService(ChatMessageChannel chatMessageChannel)
   {
     log.debug("Creating KafkaChatHomeService");
-    this.consumer = consumer;
-    this.topic = topic;
-    this.offsets = new long[numShards];
-    this.handlers = new MessageHandler[numShards];
-    for (int i=0; i< numShards; i++)
-    {
-      this.offsets[i] = 0l;
-      this.handlers[i] = new NoOpMessageHandler(i);
-    }
-    this.chatrooms = new Map[numShards];
+    this.chatMessageChanel = chatMessageChannel;
   }
 
 
   @Override
-  public void onPartitionsAssigned(Collection<TopicPartition> partitions)
+  public Mono<ChatRoom> getChatRoom(int shard, UUID id)
   {
-    consumer.endOffsets(partitions).forEach((tp, currentOffset) ->
+    if (chatMessageChanel.isLoadInProgress())
     {
-      if (!tp.topic().equals(topic))
-      {
-        log.warn("Ignoring unwanted TopicPartition", tp);
-        return;
-      }
-
-      int partition = tp.partition();
-      long unseenOffset = offsets[partition];
-
-      log.info("Reading partition {} from {} -> {}", partition, unseenOffset, currentOffset);
-      handlers[partition] = new ChatRoomLoadingMessageHandler(partition, currentOffset, unseenOffset);
-    });
-  }
-
-  @Override
-  public void onPartitionsRevoked(Collection<TopicPartition> partitions)
-  {
-    log.info("Revoked partitions: {}", partitions);
-  }
-
-  @Override
-  public void onPartitionsLost(Collection<TopicPartition> partitions)
-  {
-    log.info("Revoked partitions: {}", partitions);
-  }
-
-  private void foo()
-  {
-    Set<Integer> owned = Arrays
-      .stream(ownedShards)
-      .collect(
-        () -> new HashSet<>(),
-        (set, i) -> set.add(i),
-        (a, b) -> a.addAll(b));
-    for (int shard = 0; shard < numShards; shard++)
+      throw new ShardNotOwnedException(shard);
+    }
+    else
     {
-      chatrooms[shard] = owned.contains(shard)
-        ? new HashMap<>()
-        : null;
+      return chatMessageChanel.getChatRoom(shard, id);
     }
-    chatroomFlux
-      .filter(chatRoom ->
-      {
-        if (owned.contains(chatRoom.getShard()))
-        {
-          return true;
-        }
-        else
-        {
-          log.info("Ignoring not owned chat-room {}", chatRoom);
-          return false;
-        }
-      })
-      .toStream()
-      .forEach(chatroom -> chatrooms[chatroom.getShard()].put(chatroom.getId(), chatroom));
-  }
-
-  @Override
-  public Mono<ChatRoom> putChatRoom(ChatRoom chatRoom)
-  {
-    chatrooms[chatRoom.getShard()].put(chatRoom.getId(), chatRoom);
-    return Mono.just(chatRoom);
-  }
-
-  @Override
-  public Mono<ChatRoom> getChatRoom(int shard, UUID id)
-  {
-    return Mono.justOrEmpty(chatrooms[shard].get(id));
   }
 
   @Override
   public Flux<ChatRoom> getChatRooms(int shard)
   {
-    return Flux.fromStream(chatrooms[shard].values().stream());
-  }
-
-
-  interface MessageHandler
-  {
-    MessageHandler handleMessage(Message message);
-  }
-
-
-  @RequiredArgsConstructor
-  class NoOpMessageHandler implements MessageHandler
-  {
-    private final TopicPartition tp;
-
-    @Override
-    public MessageHandler handleMessage(Message message)
-    {
-      log.warn("Not handling message {} for partition {}", message, tp);
-      return this;
-    }
-  }
-
-  class ChatRoomLoadingMessageHandler implements MessageHandler
-  {
-    private final TopicPartition tp;
-    private final long currentOffset;
-    private final long unseenOffset;
-
-    ChatRoomLoadingMessageHandler(TopicPartition tp, long currentOffset, long unseenOffset)
-    {
-      this.tp = tp;
-      this.currentOffset = currentOffset;
-      this.unseenOffset = unseenOffset;
-
-      consumer.seek(tp, unseenOffset);
-    }
-
-    @Override
-    public MessageHandler handleMessage(Message message)
+    if (chatMessageChanel.isLoadInProgress())
     {
-      // todo
-      return this;
+      throw new ShardNotOwnedException(shard);
     }
-  }
-
-  @RequiredArgsConstructor
-  class DefaultMessageHandler implements MessageHandler
-  {
-    private final TopicPartition tp;
-
-    @Override
-    public MessageHandler handleMessage(Message message)
+    else
     {
-      chatrooms[tp.partition()].put()
-      return this;
+      return chatMessageChanel.getChatRooms(shard);
     }
   }
 }