X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fchat%2Fbackend%2Fpersistence%2Fkafka%2FChatMessageChannel.java;h=8a53d3c9fd0ef62781bc745cf706bad9f76b79b3;hb=28a98bfdbed0cf56697bece5efbe6eb52f331611;hp=084986c86fda47ac189da17f09afdff3cc69ab59;hpb=ce102485f65f9abbe4b6f602b616f0d71bd7e558;p=demos%2Fkafka%2Fchat

diff --git a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/ChatMessageChannel.java b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/ChatMessageChannel.java
index 084986c8..8a53d3c9 100644
--- a/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/ChatMessageChannel.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/persistence/kafka/ChatMessageChannel.java
@@ -1,6 +1,7 @@
 package de.juplo.kafka.chat.backend.persistence.kafka;
 
 import de.juplo.kafka.chat.backend.domain.ChatRoom;
+import de.juplo.kafka.chat.backend.domain.ChatRoomInfo;
 import de.juplo.kafka.chat.backend.domain.Message;
 import de.juplo.kafka.chat.backend.persistence.KafkaLikeShardingStrategy;
 import lombok.Getter;
@@ -25,8 +26,8 @@ import java.util.stream.IntStream;
 public class ChatMessageChannel implements Runnable, ConsumerRebalanceListener
 {
   private final String topic;
-  private final Producer<String, MessageTo> producer;
-  private final Consumer<String, MessageTo> consumer;
+  private final Producer<String, AbstractTo> producer;
+  private final Consumer<String, AbstractTo> consumer;
   private final ZoneId zoneId;
   private final int numShards;
   private final boolean[] isShardOwned;
@@ -42,8 +43,8 @@ public class ChatMessageChannel implements Runnable, ConsumerRebalanceListener
 
   public ChatMessageChannel(
     String topic,
-    Producer<String, MessageTo> producer,
-    Consumer<String, MessageTo> consumer,
+    Producer<String, AbstractTo> producer,
+    Consumer<String, AbstractTo> consumer,
     ZoneId zoneId,
     int numShards)
   {
@@ -60,11 +61,51 @@ public class ChatMessageChannel implements Runnable, ConsumerRebalanceListener
     this.currentOffset = new long[numShards];
     this.nextOffset = new long[numShards];
     this.chatrooms = new Map[numShards];
+    IntStream
+        .range(0, numShards)
+        .forEach(shard -> this.chatrooms[shard] = new HashMap<>());
     this.shardingStrategy = new KafkaLikeShardingStrategy(numShards);
   }
 
 
-  Mono<Message> sendMessage(
+
+  Mono<ChatRoomInfo> sendCreateChatRoomRequest(
+      UUID chatRoomId,
+      String name)
+  {
+    CreateChatRoomRequestTo createChatRoomRequestTo = CreateChatRoomRequestTo.of(name);
+    return Mono.create(sink ->
+    {
+      ProducerRecord<String, CreateChatRoomRequestTo> record =
+          new ProducerRecord<>(
+              topic,
+              chatRoomId.toString(),
+              createChatRoomRequestTo);
+
+      producer.send(record, ((metadata, exception) ->
+      {
+        if (metadata != null)
+        {
+          log.info("Successfully send chreate-request for chat room: {}", createChatRoomRequestTo);
+          ChatRoomInfo chatRoomInfo = ChatRoomInfo.of(chatRoomId, name, record.partition());
+          createChatRoom(chatRoomInfo);
+          sink.success(chatRoomInfo);
+        }
+        else
+        {
+          // On send-failure
+          log.error(
+              "Could not send create-request for chat room (id={}, name={}): {}",
+              chatRoomId,
+              name,
+              exception);
+          sink.error(exception);
+        }
+      }));
+    });
+  }
+
+  Mono<Message> sendChatMessage(
       UUID chatRoomId,
       Message.MessageKey key,
       LocalDateTime timestamp,
@@ -75,13 +116,13 @@ public class ChatMessageChannel implements Runnable, ConsumerRebalanceListener
     ZonedDateTime zdt = ZonedDateTime.of(timestamp, zoneId);
     return Mono.create(sink ->
     {
-      ProducerRecord<String, MessageTo> record =
+      ProducerRecord<String, ChatMessageTo> record =
           new ProducerRecord<>(
               tp.topic(),
               tp.partition(),
               zdt.toEpochSecond(),
               chatRoomId.toString(),
-              MessageTo.of(key.getUsername(), key.getMessageId(), text));
+              ChatMessageTo.of(key.getUsername(), key.getMessageId(), text));
 
       producer.send(record, ((metadata, exception) ->
       {
@@ -162,12 +203,12 @@ public class ChatMessageChannel implements Runnable, ConsumerRebalanceListener
     {
       try
       {
-        ConsumerRecords<String, MessageTo> records = consumer.poll(Duration.ofMinutes(5));
+        ConsumerRecords<String, AbstractTo> records = consumer.poll(Duration.ofMinutes(5));
         log.info("Fetched {} messages", records.count());
 
         if (loadInProgress)
         {
-          loadMessages(records);
+          loadChatRoom(records);
 
           if (isLoadingCompleted())
           {
@@ -195,33 +236,77 @@ public class ChatMessageChannel implements Runnable, ConsumerRebalanceListener
     log.info("Exiting normally");
   }
 
-  void loadMessages(ConsumerRecords<String, MessageTo> records)
+  void loadChatRoom(ConsumerRecords<String, AbstractTo> records)
   {
-    for (ConsumerRecord<String, MessageTo> record : records)
+    for (ConsumerRecord<String, AbstractTo> record : records)
     {
-      nextOffset[record.partition()] = record.offset() + 1;
       UUID chatRoomId = UUID.fromString(record.key());
-      MessageTo messageTo = record.value();
-
-      Message.MessageKey key = Message.MessageKey.of(messageTo.getUser(), messageTo.getId());
 
-      Instant instant = Instant.ofEpochSecond(record.timestamp());
-      LocalDateTime timestamp = LocalDateTime.ofInstant(instant, zoneId);
-
-      Message message = new Message(key, record.offset(), timestamp, messageTo.getText());
-
-      ChatRoom chatRoom = chatrooms[record.partition()].get(chatRoomId);
-      if (chatRoom == null)
+      switch (record.value().getType())
       {
-        // Alles pausieren und erst von putChatRoom wieder resumen lassen!
+        case CREATE_CHATROOM_REQUEST:
+          createChatRoom(
+              chatRoomId,
+              (CreateChatRoomRequestTo) record.value(),
+              record.partition());
+          break;
+
+        case MESSAGE_SENT:
+          Instant instant = Instant.ofEpochSecond(record.timestamp());
+          LocalDateTime timestamp = LocalDateTime.ofInstant(instant, zoneId);
+          loadChatMessage(
+              chatRoomId,
+              timestamp,
+              record.offset(),
+              (ChatMessageTo) record.value(),
+              record.partition());
+          break;
       }
-      KafkaChatRoomService kafkaChatRoomService =
-          (KafkaChatRoomService) chatRoom.getChatRoomService();
 
-      kafkaChatRoomService.persistMessage(message);
+      nextOffset[record.partition()] = record.offset() + 1;
     }
   }
 
+  void createChatRoom(
+      UUID chatRoomId,
+      CreateChatRoomRequestTo createChatRoomRequestTo,
+      int partition)
+  {
+    putChatRoom(ChatRoomInfo.of(
+        chatRoomId,
+        createChatRoomRequestTo.getName(),
+        partition));
+  }
+
+
+  void createChatRoom(ChatRoomInfo chatRoomInfo)
+  {
+    UUID id = chatRoomInfo.getId();
+    String name = chatRoomInfo.getName();
+    int shard = chatRoomInfo.getShard();
+    log.info("Creating ChatRoom {} with buffer-size {}", id, bufferSize);
+    KafkaChatRoomService service = new KafkaChatRoomService(this, id);
+    ChatRoom chatRoom = new ChatRoom(id, name, shard, clock, service, bufferSize);
+    putChatRoom(chatRoom);
+  }
+
+  void loadChatMessage(
+      UUID chatRoomId,
+      LocalDateTime timestamp,
+      long offset,
+      ChatMessageTo chatMessageTo,
+      int partition)
+  {
+    Message.MessageKey key = Message.MessageKey.of(chatMessageTo.getUser(), chatMessageTo.getId());
+    Message message = new Message(key, offset, timestamp, chatMessageTo.getText());
+
+    ChatRoom chatRoom = chatrooms[partition].get(chatRoomId);
+    KafkaChatRoomService kafkaChatRoomService =
+        (KafkaChatRoomService) chatRoom.getChatRoomService();
+
+    kafkaChatRoomService.persistMessage(message);
+  }
+
   boolean isLoadingCompleted()
   {
     return IntStream
@@ -240,7 +325,7 @@ public class ChatMessageChannel implements Runnable, ConsumerRebalanceListener
   }
 
 
-  void putChatRoom(ChatRoom chatRoom)
+  private void putChatRoom(ChatRoom chatRoom)
   {
     Integer partition = chatRoom.getShard();
     UUID chatRoomId = chatRoom.getId();