X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fpersistence%2Fkafka%2FKafkaChatRoomService.java;h=79f2e63a0023c29967389a0c422e06d3b58018b6;hb=409bf8614f1fb53cfb199b2377b1aae9fa3dd433;hp=981c11f527afad087386ab54f58bfedbfa819952;hpb=ba3aba8860f41fcc54970d5e234fee0576768c98;p=demos%2Fkafka%2Fchat

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 981c11f5..79f2e63a 100644
--- 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
@@ -6,12 +6,15 @@ import de.juplo.kafka.chat.backend.domain.MessageMutationException;
 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
@@ -20,6 +23,8 @@ public class KafkaChatRoomService implements ChatRoomService
 {
   private final Producer<String, MessageTo> producer;
   private final TopicPartition tp;
+  private final UUID chatRoomId;
+  private final ZoneOffset zoneOffset;
 
   private final LinkedHashMap<Message.MessageKey, Message> messages = new LinkedHashMap<>();
 
@@ -27,16 +32,60 @@ public class KafkaChatRoomService implements ChatRoomService
 
 
   @Override
-  public Message persistMessage(
+  public Mono<Message> persistMessage(
     Message.MessageKey key,
     LocalDateTime timestamp,
     String text)
   {
-    
-    Mono.error(() -> new MessageMutationException(existing, text)));
-    Message message = new Message(key, (long)messages.size(), timestamp, text);
-    messages.put(message.getKey(), message);
-    return message;
+    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);
+          }
+
+          sink.success();
+        }
+        else
+        {
+          // On send-failure
+          sink.error(exception);
+        }
+      }));
+    });
   }
 
   @Override