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

   1 package de.juplo.kafka.chat.backend.implementation.inmemory;
   2
   3 import de.juplo.kafka.chat.backend.domain.*;
   4 import de.juplo.kafka.chat.backend.domain.exceptions.UnknownChatroomException;
   5 import de.juplo.kafka.chat.backend.implementation.StorageStrategy;
   6 import lombok.extern.slf4j.Slf4j;
   7 import reactor.core.publisher.Flux;
   8 import reactor.core.publisher.Mono;
   9
  10 import java.time.Clock;
  11 import java.util.*;
  12
  13
  14 @Slf4j
  15 public class SimpleChatHomeService implements ChatHomeService
  16 {
  17   private final Integer shard;
  18   private final Map<UUID, ChatRoomInfo> chatRoomInfo;
  19   private final Map<UUID, ChatRoomData> chatRoomData;
  20   private final Clock clock;
  21   private final int bufferSize;
  22
  23
  24
  25   public SimpleChatHomeService(
  26       StorageStrategy storageStrategy,
  27       Clock clock,
  28       int bufferSize)
  29   {
  30     this(
  31         null,
  32         storageStrategy,
  33         clock,
  34         bufferSize);
  35   }
  36
  37   public SimpleChatHomeService(
  38       Integer shard,
  39       StorageStrategy storageStrategy,
  40       Clock clock,
  41       int bufferSize)
  42   {
  43     log.debug("Creating SimpleChatHomeService");
  44
  45     this.shard = shard;
  46     this.chatRoomInfo = new HashMap<>();
  47     this.chatRoomData = new HashMap<>();
  48
  49     storageStrategy
  50         .readChatRoomInfo()
  51         .filter(info ->
  52         {
  53           if (shard == null || info.getShard() == shard)
  54           {
  55             return true;
  56           }
  57           else
  58           {
  59             log.info(
  60                 "SimpleChatHome for shard {} ignores not owned chat-room {}",
  61                 shard,
  62                 info);
  63             return false;
  64           }
  65         })
  66         .doOnNext(info ->
  67         {
  68           UUID chatRoomId = info.getId();
  69           chatRoomInfo.put(chatRoomId, info);
  70           Flux<Message> messageFlux =
  71               storageStrategy.readChatRoomData(chatRoomId);
  72           chatRoomData.put(
  73               info.getId(),
  74               new ChatRoomData(
  75                   clock,
  76                   new InMemoryChatMessageService(messageFlux),
  77                   bufferSize));
  78         })
  79         .then()
  80         .doOnSuccess(empty -> log.info("Restored {}", this))
  81         .doOnError(throwable -> log.error("Could not restore {}", this))
  82         .block();
  83
  84     this.clock = clock;
  85     this.bufferSize = bufferSize;
  86   }
  87
  88
  89   @Override
  90   public Mono<ChatRoomInfo> createChatRoom(UUID id, String name)
  91   {
  92     log.info("Creating ChatRoom with buffer-size {}", bufferSize);
  93     ChatMessageService service = new InMemoryChatMessageService(Flux.empty());
  94     ChatRoomInfo chatRoomInfo = new ChatRoomInfo(id, name, shard);
  95     this.chatRoomInfo.put(id, chatRoomInfo);
  96     ChatRoomData chatRoomData = new ChatRoomData(clock, service, bufferSize);
  97     this.chatRoomData.put(id, chatRoomData);
  98     return Mono.just(chatRoomInfo);
  99   }
 100
 101   @Override
 102   public Mono<ChatRoomInfo> getChatRoomInfo(UUID id)
 103   {
 104     return Mono
 105         .justOrEmpty(chatRoomInfo.get(id))
 106         .switchIfEmpty(Mono.error(() -> new UnknownChatroomException(id)));
 107   }
 108
 109   @Override
 110   public Flux<ChatRoomInfo> getChatRoomInfo()
 111   {
 112     return Flux.fromIterable(chatRoomInfo.values());
 113   }
 114
 115   @Override
 116   public Mono<ChatRoomData> getChatRoomData(UUID id)
 117   {
 118     return Mono
 119         .justOrEmpty(chatRoomData.get(id))
 120         .switchIfEmpty(Mono.error(() -> new UnknownChatroomException(id)));
 121   }
 122
 123   @Override
 124   public Mono<String[]> getShardOwners()
 125   {
 126     return Mono.empty();
 127   }
 128
 129   @Override
 130   public String toString()
 131   {
 132     return SimpleChatHomeService.class.getSimpleName() + ", shard=" + shard;
 133   }
 134 }