NEU

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

diff --git a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatRoomService.java b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatRoomService.java
index 79f2e63..0986194 100644 (file)
--- a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatRoomService.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/KafkaChatRoomService.java
@@ -1,35 +1,25 @@
 package de.juplo.kafka.chat.backend.persistence.kafka;
 
 import de.juplo.kafka.chat.backend.domain.ChatRoomService;
-import de.juplo.kafka.chat.backend.domain.Message;
-import de.juplo.kafka.chat.backend.domain.MessageMutationException;
-import lombok.RequiredArgsConstructor;
+import de.juplo.kafka.chat.backend.domain.Message;import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.kafka.clients.producer.Producer;
-import org.apache.kafka.clients.producer.ProducerRecord;
-import org.apache.kafka.common.TopicPartition;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
 import java.time.LocalDateTime;
-import java.time.ZoneOffset;
 import java.util.LinkedHashMap;
 import java.util.UUID;
 
 
-@Slf4j
 @RequiredArgsConstructor
+@Slf4j
 public class KafkaChatRoomService implements ChatRoomService
 {
-  private final Producer<String, MessageTo> producer;
-  private final TopicPartition tp;
+  private final ChatMessageChannel chatMessageChannel;
   private final UUID chatRoomId;
-  private final ZoneOffset zoneOffset;
 
   private final LinkedHashMap<Message.MessageKey, Message> messages = new LinkedHashMap<>();
 
-  private long offset = 0l;
-
 
   @Override
   public Mono<Message> persistMessage(
@@ -37,65 +27,24 @@ public class KafkaChatRoomService implements ChatRoomService
     LocalDateTime timestamp,
     String text)
   {
-    return Mono.create(sink ->
-    {
-      ProducerRecord<String, MessageTo> record =
-          new ProducerRecord<>(
-              tp.topic(),
-              tp.partition(),
-              timestamp.toEpochSecond(zoneOffset),
-              chatRoomId.toString(),
-              MessageTo.of(key.getUsername(), key.getMessageId(), text));
-
-      producer.send(record, ((metadata, exception) ->
-      {
-        if (metadata != null)
-        {
-          // On successful send
-          Message message = messages.get(key);
-          if (message != null)
-          {
-            if (message.getMessageText().equals(text))
-            {
-              // Warn and emit existing message
-              log.warn(
-                  "Keeping existing message with {}@{} for {}",
-                  message.getSerialNumber(),
-                  message.getTimestamp(), key);
-            }
-            else
-            {
-              // Emit error and abort
-              sink.error(new MessageMutationException(message, text));
-              return;
-            }
-          }
-          else
-          {
-            // Emit new message
-            message = new Message(key, metadata.offset(), timestamp, text);
-            messages.put(message.getKey(), message);
-          }
+    return chatMessageChannel
+        .sendMessage(chatRoomId, key, timestamp, text)
+        .doOnSuccess(message -> persistMessage(message));
+  }
 
-          sink.success();
-        }
-        else
-        {
-          // On send-failure
-          sink.error(exception);
-        }
-      }));
-    });
+  void persistMessage(Message message)
+  {
+    messages.put(message.getKey(), message);
   }
 
   @Override
-  public Mono<Message> getMessage(Message.MessageKey key)
+  synchronized public Mono<Message> getMessage(Message.MessageKey key)
   {
     return Mono.fromSupplier(() -> messages.get(key));
   }
 
   @Override
-  public Flux<Message> getMessages(long first, long last)
+  synchronized public Flux<Message> getMessages(long first, long last)
   {
     return Flux.fromStream(messages
       .values()