X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fpersistence%2Finmemory%2FInMemoryChatHomeService.java;h=25a9bcf60ae07143cdd2b18e7485993463eb0f2a;hb=e1ad66ecb1dc386bb357e364a05b071ec45920e1;hp=acfd936b079854b38a9c3e33e5afd6ed57499cae;hpb=9d61871563f4be4850cebca4fad0545d504522c3;p=demos%2Fkafka%2Fchat

diff --git a/src/main/java/de/juplo/kafka/chat/backend/persistence/inmemory/InMemoryChatHomeService.java b/src/main/java/de/juplo/kafka/chat/backend/persistence/inmemory/InMemoryChatHomeService.java
index acfd936b..25a9bcf6 100644
--- a/src/main/java/de/juplo/kafka/chat/backend/persistence/inmemory/InMemoryChatHomeService.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/persistence/inmemory/InMemoryChatHomeService.java
@@ -1,49 +1,100 @@
 package de.juplo.kafka.chat.backend.persistence.inmemory;
 
-import de.juplo.kafka.chat.backend.domain.ChatRoom;
-import de.juplo.kafka.chat.backend.domain.ChatHomeService;
+import de.juplo.kafka.chat.backend.domain.*;
 import lombok.extern.slf4j.Slf4j;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
-import java.util.HashMap;
-import java.util.Map;
-import java.util.UUID;
+import java.util.*;
 
 
 @Slf4j
-public class InMemoryChatHomeService implements ChatHomeService<InMemoryChatRoomService>
+public class InMemoryChatHomeService implements ChatHomeService
 {
   private final Map<UUID, ChatRoom>[] chatrooms;
+  private final Set<Integer> ownedShards;
+  private final ShardingStrategy shardingStrategy;
 
 
-  public InMemoryChatHomeService(int numShards, Flux<ChatRoom> chatroomFlux)
+  public InMemoryChatHomeService(
+      int numShards,
+      int[] ownedShards,
+      ShardingStrategy shardingStrategy,
+      Flux<ChatRoom> chatroomFlux)
   {
     log.debug("Creating InMemoryChatHomeService");
+
     this.chatrooms = new Map[numShards];
+
+    this.ownedShards = Arrays
+        .stream(ownedShards)
+        .collect(
+            () -> new HashSet<>(),
+            (set, i) -> set.add(i),
+            (a, b) -> a.addAll(b));
+
+    this.shardingStrategy = shardingStrategy;
+
     for (int shard = 0; shard < numShards; shard++)
-        chatrooms[shard] = new HashMap<>();
+    {
+      chatrooms[shard] = this.ownedShards.contains(shard)
+          ? new HashMap<>()
+          : null;
+    }
     chatroomFlux
+        .filter(chatRoom ->
+        {
+          if (this.ownedShards.contains(chatRoom.getShard()))
+          {
+            return true;
+          }
+          else
+          {
+            log.info("Ignoring not owned chat-room {}", chatRoom);
+            return false;
+          }
+        })
         .toStream()
         .forEach(chatroom -> chatrooms[chatroom.getShard()].put(chatroom.getId(), chatroom));
   }
 
-  @Override
-  public Mono<ChatRoom> putChatRoom(ChatRoom chatRoom)
+  void putChatRoom(ChatRoom chatRoom)
   {
-    chatrooms[chatRoom.getShard()].put(chatRoom.getId(), chatRoom);
-    return Mono.just(chatRoom);
+    UUID id = chatRoom.getId();
+    int shard = shardingStrategy.selectShard(id);
+    if (!ownedShards.contains(shard))
+      throw new ShardNotOwnedException(this, chatRoom, shard, ownedShards);
+    chatrooms[shard].put(id, chatRoom);
   }
 
   @Override
-  public Mono<ChatRoom> getChatRoom(int shard, UUID id)
+  public Mono<ChatRoom> getChatRoom(UUID id)
   {
-    return Mono.justOrEmpty(chatrooms[shard].get(id));
+    int shard = shardingStrategy.selectShard(id);
+    if (ownedShards.contains(shard))
+    {
+      return Mono.justOrEmpty(chatrooms[shard].get(id));
+    }
+    else
+    {
+      int[] ownedShards = new int[this.ownedShards.size()];
+      Iterator<Integer> iterator = this.ownedShards.iterator();
+      for (int i = 0; iterator.hasNext(); i++)
+      {
+        ownedShards[i] = iterator.next();
+      }
+      return Mono.error(new UnknownChatroomException(
+          id,
+          shard,
+          ownedShards));
+    }
   }
 
   @Override
-  public Flux<ChatRoom> getChatRooms(int shard)
+  public Flux<ChatRoom> getChatRooms()
   {
-    return Flux.fromStream(chatrooms[shard].values().stream());
+    return Flux
+        .fromIterable(ownedShards)
+        .flatMap(shard -> Flux.fromIterable(chatrooms[shard].values()));
   }
 }