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.extern.slf4j.Slf4j;
   5 import reactor.core.publisher.Flux;
   6 import reactor.core.publisher.Mono;
   7 import reactor.core.publisher.Sinks;
   8
   9 import java.time.LocalDateTime;
  10 import java.util.*;
  11
  12
  13 @Slf4j
  14 public class Chatroom
  15 {
  16   @Getter
  17   private final UUID id;
  18   @Getter
  19   private final String name;
  20   private final PersistenceStrategy persistence;
  21   private final Sinks.Many<Message> sink;
  22
  23   public Chatroom(
  24       UUID id,
  25       String name,
  26       PersistenceStrategy persistence,
  27       int bufferSize)
  28   {
  29     this.id = id;
  30     this.name = name;
  31     this.persistence = persistence;
  32     this.sink = Sinks.many().multicast().onBackpressureBuffer(bufferSize);
  33   }
  34
  35
  36   synchronized public Mono<Message> addMessage(
  37       Long id,
  38       LocalDateTime timestamp,
  39       String user,
  40       String text)
  41   {
  42     return persistence
  43         .persistMessage(Message.MessageKey.of(user, id), timestamp, text)
  44         .doOnNext(message -> sink.tryEmitNext(message).orThrow());
  45   }
  46
  47
  48   public Mono<Message> getMessage(String username, Long messageId)
  49   {
  50     return persistence.getMessage(Message.MessageKey.of(username, messageId));
  51   }
  52
  53   public Flux<Message> listen()
  54   {
  55     return sink.asFlux();
  56   }
  57
  58   public Flux<Message> getMessages()
  59   {
  60     return getMessages(0, Long.MAX_VALUE);
  61   }
  62
  63   public Flux<Message> getMessages(long first, long last)
  64   {
  65     return persistence.getMessages(first, last);
  66   }
  67 }