package de.juplo.kafka.chat.backend.domain;
+import de.juplo.kafka.chat.backend.domain.exceptions.ChatRoomInactiveException;
+import de.juplo.kafka.chat.backend.domain.exceptions.InvalidUsernameException;
+import de.juplo.kafka.chat.backend.domain.exceptions.MessageMutationException;
import lombok.extern.slf4j.Slf4j;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
@Slf4j
-public class ChatRoom
+public class ChatRoomData
{
public final static Pattern VALID_USER = Pattern.compile("^[a-z0-9-]{2,}$");
+ private final ChatMessageService service;
private final Clock clock;
- private final ChatRoomService service;
- private final int bufferSize;
+ private final int historyLimit;
private Sinks.Many<Message> sink;
+ private volatile boolean active = false;
- public ChatRoom(
+ public ChatRoomData(
Clock clock,
- ChatRoomService service,
- int bufferSize)
+ ChatMessageService service,
+ int historyLimit)
{
- log.info("Created ChatRoom with buffer-size {}", bufferSize);
+ log.info("Created ChatRoom with history-limit {}", historyLimit);
this.clock = clock;
this.service = service;
- this.bufferSize = bufferSize;
+ this.historyLimit = historyLimit;
// @RequiredArgsConstructor unfortunately not possible, because
- // the `bufferSize` is not set, if `createSink()` is called
+ // the `historyLimit` is not set, if `createSink()` is called
// from the variable declaration!
- this.sink = createSink();
}
sink.error(new MessageMutationException(existing, text));
}
})
- .switchIfEmpty(
- Mono
+ .switchIfEmpty(active
+ ? Mono
.defer(() -> service.persistMessage(key, LocalDateTime.now(clock), text))
.doOnNext(m ->
{
{
log.warn("Emitting of message failed with {} for {}", result.name(), m);
}
- }));
+ })
+ : Mono.error(new ChatRoomInactiveException(service.getChatRoomId())));
}
- public ChatRoomService getChatRoomService()
+ public ChatMessageService getChatRoomService()
{
return service;
}
synchronized public Flux<Message> listen()
{
- return sink
- .asFlux()
- .doOnCancel(() -> sink = createSink()); // Sink hast to be recreated on auto-cancel!
+ return active
+ ? sink
+ .asFlux()
+ .doOnCancel(() -> sink = createSink()) // Sink hast to be recreated on auto-cancel!
+ : Flux
+ .error(new ChatRoomInactiveException(service.getChatRoomId()));
+
}
public Flux<Message> getMessages()
return service.getMessages(first, last);
}
+ public void activate()
+ {
+ if (active)
+ {
+ log.info("{} is already active!", service.getChatRoomId());
+ return;
+ }
+
+ log.info("{} is being activated", service.getChatRoomId());
+ this.sink = createSink();
+ active = true;
+ }
+
+ public void deactivate()
+ {
+ log.info("{} is being deactivated", service.getChatRoomId());
+ active = false;
+ sink.emitComplete(Sinks.EmitFailureHandler.FAIL_FAST);
+ }
+
private Sinks.Many<Message> createSink()
{
return Sinks
.many()
- .multicast()
- .onBackpressureBuffer(bufferSize);
+ .replay()
+ .limit(historyLimit);
}
}