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 Mono<Void> write(ChatHomeService chatHomeService)
  19   {
  20     return writeChatRoomInfo(
  21         chatHomeService
  22             .getChatRoomInfo()
  23             .flatMap(chatRoomInfo -> writeChatRoomData(
  24                 chatRoomInfo.getId(),
  25                 chatHomeService
  26                     .getChatRoomData(chatRoomInfo.getId())
  27                     .flatMapMany(chatRoomData -> chatRoomData.getMessages())
  28                 )
  29                 .then(Mono.just(chatRoomInfo))
  30                 .doOnSuccess(emittedChatRoomInfo -> log.info("Stored {}", chatRoomInfo))
  31                 .doOnError(throwable -> log.error("Could not store {}: {}", chatRoomInfo, throwable)))
  32         )
  33         .then()
  34         .doOnSuccess(empty -> log.info("Stored {}", chatHomeService))
  35         .doOnError(throwable -> log.error("Could not store {}: {}", chatHomeService, throwable));
  36   }
  37
  38   Flux<ChatRoomInfo> writeChatRoomInfo(Flux<ChatRoomInfo> chatRoomInfoFlux);
  39   Flux<ChatRoomInfo> readChatRoomInfo();
  40   Flux<Message> writeChatRoomData(UUID chatRoomId, Flux<Message> messageFlux);
  41   Flux<Message> readChatRoomData(UUID chatRoomId);
  42 }