X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fpersistence%2Fkafka%2FKafkaChatHomeService.java;h=eadd7629407438224af062f393a95a37a8e0defe;hb=b44e10be71112a45855d04add6497e40d4c72d24;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..eadd7629 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
@@ -2,15 +2,15 @@ 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 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.*;
 
 
@@ -18,165 +18,98 @@ import java.util.*;
 public class KafkaChatHomeService implements ChatHomeService, ConsumerRebalanceListener
 {
   private final Consumer<String, MessageTo> consumer;
+  private final Producer<String, MessageTo> producer;
   private final String topic;
-  private final long[] offsets;
-  private final MessageHandler[] handlers;
-  private final Map<UUID, ChatRoom>[] chatrooms;
+  private final ZoneId zoneId;
+  // private final long[] offsets; Erst mal immer alles neu einlesen
+  private final ChatHomeLoader[] chatHomeLoaders;
+  private final Map<UUID, ChatRoom>[] chatRoomMaps;
 
 
   public KafkaChatHomeService(
     Consumer<String, MessageTo> consumer,
+    Producer<String, MessageTo> producer,
     String topic,
+    ZoneId zoneId,
     int numShards)
   {
     log.debug("Creating KafkaChatHomeService");
     this.consumer = consumer;
+    this.producer = producer;
     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.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];
   }
 
 
   @Override
   public void onPartitionsAssigned(Collection<TopicPartition> partitions)
   {
-    consumer.endOffsets(partitions).forEach((tp, currentOffset) ->
+    consumer.endOffsets(partitions).forEach((topicPartition, currentOffset) ->
     {
-      if (!tp.topic().equals(topic))
+      if (!topicPartition.topic().equals(topic))
       {
-        log.warn("Ignoring unwanted TopicPartition", tp);
+        log.warn("Ignoring partition from unwanted topic: {}", topicPartition);
         return;
       }
 
-      int partition = tp.partition();
-      long unseenOffset = offsets[partition];
-
-      log.info("Reading partition {} from {} -> {}", partition, unseenOffset, currentOffset);
-      handlers[partition] = new ChatRoomLoadingMessageHandler(partition, currentOffset, unseenOffset);
+      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)
   {
-    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++)
+    partitions.forEach(topicPartition ->
     {
-      chatrooms[shard] = owned.contains(shard)
-        ? new HashMap<>()
-        : null;
-    }
-    chatroomFlux
-      .filter(chatRoom ->
+      if (!topicPartition.topic().equals(topic))
       {
-        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));
+        log.warn("Ignoring partition from unwanted topic: {}", topicPartition);
+        return;
+      }
+
+      int partition = topicPartition.partition();
+      // long unseenOffset = offsets[partition]; TODO: Offset merken...?
+    });
+    log.info("Revoked partitions: {}", partitions);
   }
 
   @Override
-  public Mono<ChatRoom> putChatRoom(ChatRoom chatRoom)
+  public void onPartitionsLost(Collection<TopicPartition> partitions)
   {
-    chatrooms[chatRoom.getShard()].put(chatRoom.getId(), chatRoom);
-    return Mono.just(chatRoom);
+    // TODO: Muss auf den Verlust anders reagiert werden?
+    onPartitionsRevoked(partitions);
   }
 
   @Override
   public Mono<ChatRoom> getChatRoom(int shard, UUID id)
   {
-    return Mono.justOrEmpty(chatrooms[shard].get(id));
+    return Mono.justOrEmpty(chatRoomMaps[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)
-    {
-      // todo
-      return this;
-    }
-  }
-
-  @RequiredArgsConstructor
-  class DefaultMessageHandler implements MessageHandler
-  {
-    private final TopicPartition tp;
-
-    @Override
-    public MessageHandler handleMessage(Message message)
-    {
-      chatrooms[tp.partition()].put()
-      return this;
-    }
+    return Flux.fromStream(chatRoomMaps[shard].values().stream());
   }
 }