X-Git-Url: http://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fapi%2FChatBackendController.java;h=1c0224bc6e7c0f5be7df2942af533ccafe3f14d6;hb=9d61871563f4be4850cebca4fad0545d504522c3;hp=12f8d67f9a2d302c50bb3bdb668f272c80de57f4;hpb=97984a15c5c2e62bb92ba8cfc4b06166f7586c41;p=demos%2Fkafka%2Fchat

diff --git a/src/main/java/de/juplo/kafka/chat/backend/api/ChatBackendController.java b/src/main/java/de/juplo/kafka/chat/backend/api/ChatBackendController.java
index 12f8d67f..1c0224bc 100644
--- a/src/main/java/de/juplo/kafka/chat/backend/api/ChatBackendController.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/api/ChatBackendController.java
@@ -1,76 +1,83 @@
 package de.juplo.kafka.chat.backend.api;
 
 import de.juplo.kafka.chat.backend.domain.ChatHome;
-import de.juplo.kafka.chat.backend.domain.Chatroom;
+import de.juplo.kafka.chat.backend.domain.ChatRoom;
+import de.juplo.kafka.chat.backend.domain.ChatRoomFactory;
 import de.juplo.kafka.chat.backend.persistence.StorageStrategy;
 import lombok.RequiredArgsConstructor;
-import org.springframework.http.MediaType;
 import org.springframework.http.codec.ServerSentEvent;
 import org.springframework.web.bind.annotation.*;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
-import java.time.Clock;
-import java.time.LocalDateTime;
-import java.util.Optional;
 import java.util.UUID;
-import java.util.stream.Stream;
 
 
 @RestController
 @RequiredArgsConstructor
 public class ChatBackendController
 {
-  private final ChatHome chatHome;
-  private final Clock clock;
+  private final ChatHome[] chatHomes;
+  private final ShardingStrategy selectionStrategy;
+  private final ChatRoomFactory factory;
   private final StorageStrategy storageStrategy;
 
 
   @PostMapping("create")
-  public ChatroomTo create(@RequestBody String name)
+  public Mono<ChatRoomTo> create(@RequestBody String name)
   {
-    return ChatroomTo.from(chatHome.createChatroom(name));
+    UUID chatRoomId = UUID.randomUUID();
+    return factory
+        .createChatRoom(chatRoomId, name)
+        .flatMap(chatRoom -> chatHomes[chatRoom.getShard()].putChatRoom(chatRoom))
+        .map(ChatRoomTo::from);
   }
 
   @GetMapping("list")
-  public Stream<ChatroomTo> list()
+  public Flux<ChatRoomTo> list()
   {
-    return chatHome.list().map(chatroom -> ChatroomTo.from(chatroom));
+    return Flux
+        .fromArray(chatHomes)
+        .flatMap(chatHome -> chatHome.getChatRooms())
+        .map(chatroom -> ChatRoomTo.from(chatroom));
   }
 
-  @GetMapping("list/{chatroomId}")
+  @GetMapping("{chatroomId}/list")
   public Flux<MessageTo> list(@PathVariable UUID chatroomId)
   {
-    return chatHome
-        .getChatroom(chatroomId)
-        .map(chatroom -> chatroom
+    int shard = selectionStrategy.selectShard(chatroomId);
+    return chatHomes[shard]
+        .getChatRoom(chatroomId)
+        .flatMapMany(chatroom -> chatroom
             .getMessages()
-            .map(MessageTo::from))
-        .get();
+            .map(MessageTo::from));
   }
 
-  @GetMapping("get/{chatroomId}")
-  public Optional<ChatroomTo> get(@PathVariable UUID chatroomId)
+  @GetMapping("{chatroomId}")
+  public Mono<ChatRoomTo> get(@PathVariable UUID chatroomId)
   {
-    return chatHome.getChatroom(chatroomId).map(chatroom -> ChatroomTo.from(chatroom));
+    int shard = selectionStrategy.selectShard(chatroomId);
+    return chatHomes[shard]
+        .getChatRoom(chatroomId)
+        .map(chatroom -> ChatRoomTo.from(chatroom));
   }
 
-  @PutMapping("put/{chatroomId}/{username}/{messageId}")
+  @PutMapping("{chatroomId}/{username}/{messageId}")
   public Mono<MessageTo> put(
       @PathVariable UUID chatroomId,
       @PathVariable String username,
       @PathVariable Long messageId,
       @RequestBody String text)
   {
+    int shard = selectionStrategy.selectShard(chatroomId);
     return
-        chatHome
-            .getChatroom(chatroomId)
-            .map(chatroom -> put(chatroom, username, messageId, text))
-            .orElseThrow(() -> new UnknownChatroomException(chatroomId));
+        chatHomes[shard]
+            .getChatRoom(chatroomId)
+            .flatMap(chatroom -> put(chatroom, username, messageId, text));
   }
 
   public Mono<MessageTo> put(
-      Chatroom chatroom,
+      ChatRoom chatroom,
       String username,
       Long messageId,
       String text)
@@ -79,28 +86,26 @@ public class ChatBackendController
         chatroom
             .addMessage(
                 messageId,
-                LocalDateTime.now(clock),
                 username,
                 text)
-            .switchIfEmpty(chatroom.getMessage(username, messageId))
             .map(message -> MessageTo.from(message));
   }
 
-  @GetMapping("get/{chatroomId}/{username}/{messageId}")
+  @GetMapping("{chatroomId}/{username}/{messageId}")
   public Mono<MessageTo> get(
       @PathVariable UUID chatroomId,
       @PathVariable String username,
       @PathVariable Long messageId)
   {
+    int shard = selectionStrategy.selectShard(chatroomId);
     return
-        chatHome
-            .getChatroom(chatroomId)
-            .map(chatroom -> get(chatroom, username, messageId))
-            .orElseThrow(() -> new UnknownChatroomException(chatroomId));
+        chatHomes[shard]
+            .getChatRoom(chatroomId)
+            .flatMap(chatroom -> get(chatroom, username, messageId));
   }
 
   private Mono<MessageTo> get(
-      Chatroom chatroom,
+      ChatRoom chatroom,
       String username,
       Long messageId)
   {
@@ -110,16 +115,16 @@ public class ChatBackendController
             .map(message -> MessageTo.from(message));
   }
 
-  @GetMapping(path = "listen/{chatroomId}")
+  @GetMapping(path = "{chatroomId}/listen")
   public Flux<ServerSentEvent<MessageTo>> listen(@PathVariable UUID chatroomId)
   {
-    return chatHome
-        .getChatroom(chatroomId)
-        .map(chatroom -> listen(chatroom))
-        .orElseThrow(() -> new UnknownChatroomException(chatroomId));
+    int shard = selectionStrategy.selectShard(chatroomId);
+    return chatHomes[shard]
+        .getChatRoom(chatroomId)
+        .flatMapMany(chatroom -> listen(chatroom));
   }
 
-  private Flux<ServerSentEvent<MessageTo>> listen(Chatroom chatroom)
+  private Flux<ServerSentEvent<MessageTo>> listen(ChatRoom chatroom)
   {
     return chatroom
         .listen()
@@ -136,6 +141,7 @@ public class ChatBackendController
   @PostMapping("/store")
   public void store()
   {
-    storageStrategy.writeChatrooms(Flux.fromStream(chatHome.list()));
+    for (int shard = 0; shard < chatHomes.length; shard++)
+      storageStrategy.write(chatHomes[shard].getChatRooms());
   }
 }