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 4460432..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
@@ -4,186 +4,48 @@ 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.consumer.ConsumerRecord;
-import org.apache.kafka.clients.consumer.ConsumerRecords;
-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.Duration;
-import java.time.ZoneId;
 import java.util.*;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
 
 
 @Slf4j
-public class KafkaChatHomeService implements ChatHomeService, Runnable, ConsumerRebalanceListener
+public class KafkaChatHomeService implements ChatHomeService
 {
-  private final ExecutorService executorService;
-  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 boolean[] isShardOwned;
-  private final Map<UUID, ChatRoom>[] chatRoomMaps;
-  private final ReadWriteLock lock = new ReentrantReadWriteLock();
+  private final ChatMessageChannel chatMessageChanel;
 
-  private boolean running;
 
-
-  public KafkaChatHomeService(
-    ExecutorService executorService,
-    Consumer<String, MessageTo> consumer,
-    Producer<String, MessageTo> producer,
-    String topic,
-    ZoneId zoneId,
-    int numShards)
+  public KafkaChatHomeService(ChatMessageChannel chatMessageChannel)
   {
     log.debug("Creating KafkaChatHomeService");
-    this.executorService = executorService;
-    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.isShardOwned = new boolean[numShards];
-    this.chatRoomMaps = new Map[numShards];
-  }
-
-
-  @Override
-  public void onPartitionsAssigned(Collection<TopicPartition> partitions)
-  {
-    try
-    {
-      lock.writeLock().lock();
-
-      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);
-      });
-
-      consumer.resume(partitions);
-    }
-    finally
-    {
-      lock.writeLock().unlock();
-    }
-  }
-
-  @Override
-  public void onPartitionsRevoked(Collection<TopicPartition> partitions)
-  {
-    partitions.forEach(topicPartition ->
-    {
-      if (!topicPartition.topic().equals(topic))
-      {
-        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);
+    this.chatMessageChanel = chatMessageChannel;
   }
 
-  @Override
-  public void onPartitionsLost(Collection<TopicPartition> partitions)
-  {
-    // TODO: Muss auf den Verlust anders reagiert werden?
-    onPartitionsRevoked(partitions);
-  }
-
-  @Override
-  public void run()
-  {
-    consumer.subscribe(List.of(topic));
-
-    running = true;
-
-    try
-    {
-      while (running)
-      {
-        ConsumerRecords<String, MessageTo> records = consumer.poll(Duration.ofMinutes(5));
-        log.info("Fetched {} messages", records.count());
-
-        for (ConsumerRecord<String, MessageTo> record : records)
-        {
-
-        }
-      }
-    }
-  }
 
   @Override
   public Mono<ChatRoom> getChatRoom(int shard, UUID id)
   {
-    if (lock.readLock().tryLock())
+    if (chatMessageChanel.isLoadInProgress())
     {
-      try
-      {
-        return Mono.justOrEmpty(chatRoomMaps[shard].get(id));
-      }
-      finally
-      {
-        lock.readLock().unlock();
-      }
+      throw new ShardNotOwnedException(shard);
     }
     else
     {
-      throw new ShardNotOwnedException(shard);
+      return chatMessageChanel.getChatRoom(shard, id);
     }
   }
 
   @Override
   public Flux<ChatRoom> getChatRooms(int shard)
   {
-    if (lock.readLock().tryLock())
+    if (chatMessageChanel.isLoadInProgress())
     {
-      try
-      {
-        return Flux.fromStream(chatRoomMaps[shard].values().stream());
-      }
-      finally
-      {
-        lock.readLock().unlock();
-      }
+      throw new ShardNotOwnedException(shard);
     }
     else
     {
-      throw new ShardNotOwnedException(shard);
+      return chatMessageChanel.getChatRooms(shard);
     }
   }
 }