juplo.de Git - demos/kafka/chat/blob - src/main/java/de/juplo/kafka/chat/backend/persistence/storage/mongodb/MongoDbStorageStrategy.java

   1 package de.juplo.kafka.chat.backend.persistence.storage.mongodb;
   2
   3 import de.juplo.kafka.chat.backend.domain.ShardingStrategy;
   4 import de.juplo.kafka.chat.backend.domain.ChatRoom;
   5 import de.juplo.kafka.chat.backend.persistence.StorageStrategy;
   6 import de.juplo.kafka.chat.backend.persistence.storage.files.ChatRoomServiceFactory;
   7 import lombok.RequiredArgsConstructor;
   8 import lombok.extern.slf4j.Slf4j;
   9 import reactor.core.publisher.Flux;
  10
  11 import java.time.Clock;
  12 import java.util.UUID;
  13
  14
  15 @RequiredArgsConstructor
  16 @Slf4j
  17 public class MongoDbStorageStrategy implements StorageStrategy
  18 {
  19   private final ChatRoomRepository repository;
  20   private final Clock clock;
  21   private final int bufferSize;
  22   private final ShardingStrategy shardingStrategy;
  23   private final ChatRoomServiceFactory factory;
  24
  25
  26   @Override
  27   public void write(Flux<ChatRoomInfo> chatroomFlux)
  28   {
  29     chatroomFlux
  30         .map(ChatRoomTo::from)
  31         .subscribe(chatroomTo -> repository.save(chatroomTo));
  32   }
  33
  34   @Override
  35   public Flux<ChatRoom> read()
  36   {
  37     return Flux
  38         .fromIterable(repository.findAll())
  39         .map(chatRoomTo ->
  40         {
  41           UUID chatRoomId = UUID.fromString(chatRoomTo.getId());
  42           int shard = shardingStrategy.selectShard(chatRoomId);
  43           return new ChatRoom(
  44               chatRoomId,
  45               chatRoomTo.getName(),
  46               shard,
  47               clock,
  48               factory.create(
  49                   Flux
  50                       .fromIterable(chatRoomTo.getMessages())
  51                       .map(messageTo -> messageTo.toMessage())),
  52               bufferSize);
  53         });
  54   }
  55 }