feat: The position of the last seen messages is stored on a revoke

[demos/kafka/chat] / src / main / java / de / juplo / kafka / chat / backend / implementation / kafka / DataChannel.java

diff --git a/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/DataChannel.java b/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/DataChannel.java
index d2d6f30..03eaabf 100644 (file)
--- a/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/DataChannel.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/implementation/kafka/DataChannel.java
@@ -25,6 +25,7 @@ import java.util.stream.IntStream;
 @Slf4j
 public class DataChannel implements Runnable, ConsumerRebalanceListener
 {
+  private final String instanceId;
   private final String topic;
   private final Producer<String, AbstractMessageTo> producer;
   private final Consumer<String, AbstractMessageTo> consumer;
@@ -37,6 +38,7 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
   private final long[] nextOffset;
   private final Map<UUID, ChatRoomData>[] chatRoomData;
   private final InfoChannel infoChannel;
+  private final ShardingPublisherStrategy shardingPublisherStrategy;
 
   private boolean running;
   @Getter
@@ -44,6 +46,7 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
 
 
   public DataChannel(
+    String instanceId,
     String topic,
     Producer<String, AbstractMessageTo> producer,
     Consumer<String, AbstractMessageTo> dataChannelConsumer,
@@ -51,12 +54,15 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
     int numShards,
     int bufferSize,
     Clock clock,
-    InfoChannel infoChannel)
+    InfoChannel infoChannel,
+    ShardingPublisherStrategy shardingPublisherStrategy)
   {
     log.debug(
-        "Creating DataChannel for topic {} with {} partitions",
+        "{}: Creating DataChannel for topic {} with {} partitions",
+        instanceId,
         topic,
         numShards);
+    this.instanceId = instanceId;
     this.topic = topic;
     this.consumer = dataChannelConsumer;
     this.producer = producer;
@@ -72,6 +78,7 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
         .range(0, numShards)
         .forEach(shard -> this.chatRoomData[shard] = new HashMap<>());
     this.infoChannel = infoChannel;
+    this.shardingPublisherStrategy = shardingPublisherStrategy;
   }
 
 
@@ -95,7 +102,7 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
 
       producer.send(record, ((metadata, exception) ->
       {
-        if (metadata != null)
+        if (exception == null)
         {
           // On successful send
           Message message = new Message(key, metadata.offset(), timestamp, text);
@@ -137,6 +144,14 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
           currentOffset);
 
       consumer.seek(topicPartition, nextOffset[partition]);
+      infoChannel.sendShardAssignedEvent(partition);
+      shardingPublisherStrategy
+          .publishOwnership(partition)
+          .doOnNext(instanceId -> log.info(
+              "Instance {} was published as owner of shard {}",
+              instanceId,
+              partition))
+          .subscribe();
     });
 
     consumer.resume(partitions);
@@ -149,7 +164,9 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
     {
       int partition = topicPartition.partition();
       isShardOwned[partition] = false;
+      nextOffset[partition] = consumer.position(topicPartition);
       log.info("Partition revoked: {} - next={}", partition, nextOffset[partition]);
+      infoChannel.sendShardRevokedEvent(partition);
     });
   }
 
@@ -244,17 +261,17 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
     Message.MessageKey key = Message.MessageKey.of(chatMessageTo.getUser(), chatMessageTo.getId());
     Message message = new Message(key, offset, timestamp, chatMessageTo.getText());
 
-    ChatRoomData chatRoomData = this.chatRoomData[partition].computeIfAbsent(
-        chatRoomId,
-        (id) ->
-        {
-          log.info("Creating ChatRoom {} with buffer-size {}", id, bufferSize);
-          KafkaChatMessageService service = new KafkaChatMessageService(this, id);
-          return new ChatRoomData(clock, service, bufferSize);
-        });
+    ChatRoomData chatRoomData = this
+        .chatRoomData[partition]
+        .computeIfAbsent(chatRoomId, this::computeChatRoomData);
     KafkaChatMessageService kafkaChatRoomService =
         (KafkaChatMessageService) chatRoomData.getChatRoomService();
 
+    log.debug(
+        "Loaded message from partition={} at offset={}: {}",
+        partition,
+        offset,
+        message);
     kafkaChatRoomService.persistMessage(message);
   }
 
@@ -263,7 +280,12 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
     return IntStream
         .range(0, numShards)
         .filter(shard -> isShardOwned[shard])
-        .allMatch(shard -> nextOffset[shard] >= currentOffset[shard]);
+        .allMatch(shard ->
+        {
+          TopicPartition partition = new TopicPartition(topic, shard);
+          long position = consumer.position(partition);
+          return position >= currentOffset[shard];
+        });
   }
 
   private void pauseAllOwnedPartions()
@@ -293,18 +315,19 @@ public class DataChannel implements Runnable, ConsumerRebalanceListener
 
     if (!isShardOwned[shard])
     {
-      return Mono.error(new ShardNotOwnedException(shard));
+      return Mono.error(new ShardNotOwnedException(instanceId, shard));
     }
 
     return infoChannel
         .getChatRoomInfo(id)
-        .map(chatRoomInfo -> chatRoomData[shard].computeIfAbsent(
-            id,
-            (chatRoomId) ->
-            {
-              log.info("Creating ChatRoom {} with buffer-size {}", chatRoomId, bufferSize);
-              KafkaChatMessageService service = new KafkaChatMessageService(this, chatRoomId);
-              return new ChatRoomData(clock, service, bufferSize);
-            }));
+        .map(chatRoomInfo ->
+            chatRoomData[shard].computeIfAbsent(id, this::computeChatRoomData));
+  }
+
+  private ChatRoomData computeChatRoomData(UUID chatRoomId)
+  {
+    log.info("Creating ChatRoom {} with buffer-size {}", chatRoomId, bufferSize);
+    KafkaChatMessageService service = new KafkaChatMessageService(this, chatRoomId);
+    return new ChatRoomData(clock, service, bufferSize);
   }
 }