- return chatroomService
- .persistMessage(Message.MessageKey.of(user, id), timestamp, text)
- .doOnNext(message ->
- {
- Sinks.EmitResult result = sink.tryEmitNext(message);
- if (result.isFailure())
- {
- log.warn("Emitting of message failed with {} for {}", result.name(), message);
- }
- });
+ Matcher matcher = VALID_USER.matcher(user);
+ if (!matcher.matches())
+ throw new InvalidUsernameException(user);
+
+ Message.MessageKey key = Message.MessageKey.of(user, id);
+ return service
+ .getMessage(key)
+ .flatMap(existing -> text.equals(existing.getMessageText())
+ ? Mono.just(existing)
+ : Mono.error(() -> new MessageMutationException(existing, text)))
+ .switchIfEmpty(
+ Mono
+ .fromSupplier(() ->service.persistMessage(key, LocalDateTime.now(clock), text))
+ .doOnNext(m ->
+ {
+ Sinks.EmitResult result = sink.tryEmitNext(m);
+ if (result.isFailure())
+ {
+ log.warn("Emitting of message failed with {} for {}", result.name(), m);
+ }
+ }));