import lombok.Getter;
import lombok.RequiredArgsConstructor;
-import lombok.Value;
import lombok.extern.slf4j.Slf4j;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import java.time.LocalDateTime;
import java.util.*;
-import java.util.stream.Stream;
@RequiredArgsConstructor
private final UUID id;
@Getter
private final String name;
- private final LinkedHashMap<MessageKey, Message> messages = new LinkedHashMap<>();
+ private final PersistenceStrategy persistence;
private final Sinks.Many<Message> sink = Sinks.many().multicast().onBackpressureBuffer();
synchronized public Mono<Message> addMessage(
String user,
String text)
{
- return persistMessage(id, timestamp, user, text)
+ return persistence
+ .persistMessage(Message.MessageKey.of(user, id), timestamp, text)
.doOnNext(message -> sink.tryEmitNext(message).orThrow());
}
- private Mono<Message> persistMessage(
- Long id,
- LocalDateTime timestamp,
- String user,
- String text)
- {
- Message message = new Message(id, (long)messages.size(), timestamp, user, text);
-
- MessageKey key = new MessageKey(user, id);
- Message existing = messages.get(key);
- if (existing != null)
- {
- log.info("Message with key {} already exists; {}", key, existing);
- if (!message.equals(existing))
- throw new MessageMutationException(message, existing);
- return Mono.empty();
- }
-
- messages.put(key, message);
- return Mono
- .fromSupplier(() -> message)
- .log();
- }
public Mono<Message> getMessage(String username, Long messageId)
{
- return Mono.fromSupplier(() ->
- {
- MessageKey key = MessageKey.of(username, messageId);
- return messages.get(key);
- });
+ return persistence.getMessage(Message.MessageKey.of(username, messageId));
}
public Flux<Message> listen()
return sink.asFlux();
}
- public Stream<Message> getMessages(long first, long last)
- {
- return messages
- .values()
- .stream()
- .filter(message ->
- {
- long serial = message.getSerialNumber();
- return serial >= first && serial <= last;
- });
- }
-
-
- @Value(staticConstructor = "of")
- static class MessageKey
+ public Flux<Message> getMessages(long first, long last)
{
- String username;
- Long messageId;
+ return persistence.getMessages(first, last);
}
}