juplo.de Git - demos/kafka/chat/blob - src/main/java/de/juplo/kafka/chat/backend/implementation/StorageStrategy.java

   1 package de.juplo.kafka.chat.backend.implementation;
   2
   3 import de.juplo.kafka.chat.backend.domain.ChatHomeService;
   4 import de.juplo.kafka.chat.backend.domain.ChatRoomInfo;
   5 import de.juplo.kafka.chat.backend.domain.Message;
   6 import org.slf4j.Logger;
   7 import org.slf4j.LoggerFactory;
   8 import reactor.core.publisher.Flux;
   9 import reactor.core.publisher.Mono;
  10
  11 import java.util.UUID;
  12
  13
  14 public interface StorageStrategy
  15 {
  16   Logger log = LoggerFactory.getLogger(StorageStrategy.class.getCanonicalName());
  17
  18   default Flux<ChatRoomInfo> write(ChatHomeService chatHomeService)
  19   {
  20     return writeChatRoomInfo(
  21         chatHomeService
  22             .getChatRoomInfo()
  23             .flatMap(chatRoomInfo ->
  24                 writeChatRoomData(
  25                     chatRoomInfo.getId(),
  26                     chatHomeService
  27                         .getChatRoomData(chatRoomInfo.getId())
  28                         .flatMapMany(chatRoomData -> chatRoomData.getMessages())
  29                         )
  30                     .then(Mono.just(chatRoomInfo))
  31                     .doOnSuccess(empty -> log.info("Stored {}", chatRoomInfo))
  32                     .doOnError(throwable -> log.error("Could not store {}: {}", chatRoomInfo, throwable))))
  33         .doOnComplete(() -> log.info("Stored {}", chatHomeService))
  34         .doOnError(throwable -> log.error("Could not store {}: {}", chatHomeService, throwable));
  35   }
  36
  37   Flux<ChatRoomInfo> writeChatRoomInfo(Flux<ChatRoomInfo> chatRoomInfoFlux);
  38   Flux<ChatRoomInfo> readChatRoomInfo();
  39   Flux<Message> writeChatRoomData(UUID chatRoomId, Flux<Message> messageFlux);
  40   Flux<Message> readChatRoomData(UUID chatRoomId);
  41 }