NEU

[demos/kafka/chat] / src / main / java / de / juplo / kafka / chat / backend / persistence / kafka / KafkaChatHomeService.java

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 7ebf049..38aecd1 100644 (file)
--- 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
@@ -2,153 +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.ShardNotOwnedException;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.consumer.Consumer;
-import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
-import org.apache.kafka.clients.producer.Producer;
-import org.apache.kafka.common.TopicPartition;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
-import java.time.ZoneId;
 import java.util.*;
 
 
 @Slf4j
-public class KafkaChatHomeService implements ChatHomeService, ConsumerRebalanceListener
+public class KafkaChatHomeService implements ChatHomeService
 {
-  private final Consumer<String, MessageTo> consumer;
-  private final Producer<String, MessageTo> producer;
-  private final String topic;
-  private final ZoneId zoneId;
-  // private final long[] offsets; Erst mal immer alles neu einlesen
-  private final ChatHomeLoader[] chatHomeLoaders;
-  private final Map<UUID, ChatRoom>[] chatRoomMaps;
+  private final ChatMessageChannel chatMessageChanel;
 
 
-  public KafkaChatHomeService(
-    Consumer<String, MessageTo> consumer,
-    Producer<String, MessageTo> producer,
-    String topic,
-    ZoneId zoneId,
-    int numShards)
+  public KafkaChatHomeService(ChatMessageChannel chatMessageChannel)
   {
     log.debug("Creating KafkaChatHomeService");
-    this.consumer = consumer;
-    this.producer = producer;
-    this.topic = topic;
-    this.zoneId = zoneId;
-    // this.offsets = new long[numShards];
-    // for (int i=0; i< numShards; i++)
-    // {
-    //   this.offsets[i] = 0l;
-    // }
-    this.chatHomeLoaders = new ChatHomeLoader[numShards];
-    this.chatRoomMaps = new Map[numShards];
+    this.chatMessageChanel = chatMessageChannel;
   }
 
 
   @Override
-  public void onPartitionsAssigned(Collection<TopicPartition> partitions)
-  {
-    consumer.endOffsets(partitions).forEach((topicPartition, currentOffset) ->
-    {
-      if (!topicPartition.topic().equals(topic))
-      {
-        log.warn("Ignoring partition from unwanted topic: {}", topicPartition);
-        return;
-      }
-
-      int partition = topicPartition.partition();
-      long unseenOffset = 0; // offsets[partition];
-
-      log.info(
-          "Loading messages from partition {}: start-offset={} -> current-offset={}",
-          partition,
-          unseenOffset,
-          currentOffset);
-
-      // TODO: reuse! Nicht immer alles neu laden, sondern erst ab offsets[partition]!
-      consumer.seek(topicPartition, unseenOffset);
-      chatHomeLoaders[partition] = new ChatHomeLoader(
-          producer,
-          currentOffset,
-          zoneId);
-    });
-  }
-
-  @Override
-  public void onPartitionsRevoked(Collection<TopicPartition> partitions)
+  public Mono<ChatRoom> getChatRoom(int shard, UUID id)
   {
-    partitions.forEach(tp ->
+    if (chatMessageChanel.isLoadInProgress())
     {
-      if (!tp.topic().equals(topic))
-      {
-        log.warn("Ignoring partition from unwanted topic: {}", tp);
-        return;
-      }
-
-      int partition = tp.partition();
-      long unseenOffset = offsets[partition];
-
-      log.info("Reading partition {} from {} -> {}", partition, unseenOffset, currentOffset);
-    });
-    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
     {
-      chatRoomMaps[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 -> chatRoomMaps[chatroom.getShard()].put(chatroom.getId(), chatroom));
-  }
-
-  @Override
-  public Mono<ChatRoom> putChatRoom(ChatRoom chatRoom)
-  {
-    chatRoomMaps[chatRoom.getShard()].put(chatRoom.getId(), chatRoom);
-    return Mono.just(chatRoom);
-  }
-
-  @Override
-  public Mono<ChatRoom> getChatRoom(int shard, UUID id)
-  {
-    return Mono.justOrEmpty(chatRoomMaps[shard].get(id));
   }
 
   @Override
   public Flux<ChatRoom> getChatRooms(int shard)
   {
-    return Flux.fromStream(chatRoomMaps[shard].values().stream());
+    if (chatMessageChanel.isLoadInProgress())
+    {
+      throw new ShardNotOwnedException(shard);
+    }
+    else
+    {
+      return chatMessageChanel.getChatRooms(shard);
+    }
   }
 }