import de.juplo.kafka.chat.backend.domain.MessageMutationException;
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
{
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<>();
- private volatile MessageHandlingStrategy strategy;
-
public KafkaChatRoomService(
Producer<String, MessageTo> producer,
- TopicPartition tp,
- UUID chatRoomId,
- ZoneOffset zoneOffset)
+ TopicPartition tp)
{
this.producer = producer;
this.tp = tp;
- this.chatRoomId = chatRoomId;
- this.zoneOffset = zoneOffset;
- this.strategy = new ChatroomInactiveMessageHandlingStrategy(tp);
}
LocalDateTime timestamp,
String text)
{
- return strategy.persistMessage(key, timestamp, 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
+ {
+ // Emit new message
+ Message message = new Message(key, metadata.offset(), timestamp, text);
+ kafkaChatRoomService.addMessage(message);
+ }
+
+ sink.success();
+ }
+ else
+ {
+ // On send-failure
+ sink.error(exception);
+ }
+ }));
+ });
}
+ /**
+ * {@code synchronized} ist nicht nötig, da Aufruf immer indirekt über
+ * {@link #persistMessage(Message.MessageKey, LocalDateTime, String)}
+ */
protected void addMessage(Message message) throws MessageMutationException
{
Message existingMessage = messages.get(message.getKey());