juplo.de Git - demos/kafka/chat/blob - src/main/java/de/juplo/kafka/chat/backend/domain/Chatroom.java

   1 package de.juplo.kafka.chat.backend.domain;
   2
   3 import lombok.Getter;
   4 import lombok.RequiredArgsConstructor;
   5 import lombok.extern.slf4j.Slf4j;
   6 import reactor.core.publisher.Flux;
   7 import reactor.core.publisher.Mono;
   8 import reactor.core.publisher.Sinks;
   9
  10 import java.time.LocalDateTime;
  11 import java.util.*;
  12
  13
  14 @RequiredArgsConstructor
  15 @Slf4j
  16 public class Chatroom
  17 {
  18   @Getter
  19   private final UUID id;
  20   @Getter
  21   private final String name;
  22   private final PersistenceStrategy persistence;
  23   private final Sinks.Many<Message> sink = Sinks.many().multicast().onBackpressureBuffer();
  24
  25   synchronized public Mono<Message> addMessage(
  26       Long id,
  27       LocalDateTime timestamp,
  28       String user,
  29       String text)
  30   {
  31     return persistence
  32         .persistMessage(Message.MessageKey.of(user, id), timestamp, text)
  33         .doOnNext(message -> sink.tryEmitNext(message).orThrow());
  34   }
  35
  36
  37   public Mono<Message> getMessage(String username, Long messageId)
  38   {
  39     return persistence.getMessage(Message.MessageKey.of(username, messageId));
  40   }
  41
  42   public Flux<Message> listen()
  43   {
  44     return sink.asFlux();
  45   }
  46
  47   public Flux<Message> getMessages()
  48   {
  49     return getMessages(0, Long.MAX_VALUE);
  50   }
  51
  52   public Flux<Message> getMessages(long first, long last)
  53   {
  54     return persistence.getMessages(first, last);
  55   }
  56 }