1 package de.juplo.kafka.chat.backend.domain;
3 import lombok.EqualsAndHashCode;
5 import lombok.ToString;
6 import lombok.extern.slf4j.Slf4j;
7 import reactor.core.publisher.Flux;
8 import reactor.core.publisher.Mono;
9 import reactor.core.publisher.Sinks;
11 import java.time.Clock;
12 import java.time.LocalDateTime;
17 @EqualsAndHashCode(of = { "id" })
18 @ToString(of = { "id", "name" })
22 private final UUID id;
24 private final String name;
25 private final Clock clock;
26 private final ChatRoomService service;
27 private final int bufferSize;
28 private Sinks.Many<Message> sink;
34 ChatRoomService service,
40 this.service = service;
41 this.bufferSize = bufferSize;
42 this.sink = createSink();
46 synchronized public Mono<Message> addMessage(
51 Message.MessageKey key = Message.MessageKey.of(user, id);
54 .flatMap(existing -> text.equals(existing.getMessageText())
56 : Mono.error(() -> new MessageMutationException(existing, text)))
59 .fromSupplier(() ->service.persistMessage(key, LocalDateTime.now(clock), text))
62 Sinks.EmitResult result = sink.tryEmitNext(m);
63 if (result.isFailure())
65 log.warn("Emitting of message failed with {} for {}", result.name(), m);
71 public Mono<Message> getMessage(String username, Long messageId)
73 Message.MessageKey key = Message.MessageKey.of(username, messageId);
74 return service.getMessage(key);
77 synchronized public Flux<Message> listen()
81 .doOnCancel(() -> sink = createSink()); // Sink hast to be recreated on auto-cancel!
84 public Flux<Message> getMessages()
86 return getMessages(0, Long.MAX_VALUE);
89 public Flux<Message> getMessages(long first, long last)
91 return service.getMessages(first, last);
94 private Sinks.Many<Message> createSink()
99 .onBackpressureBuffer(bufferSize);