WIP:mongodb

[demos/kafka/chat] / src / main / java / de / juplo / kafka / chat / backend / implementation / StorageStrategy.java

diff --git a/src/main/java/de/juplo/kafka/chat/backend/implementation/StorageStrategy.java b/src/main/java/de/juplo/kafka/chat/backend/implementation/StorageStrategy.java
index 9fb115e..868ae11 100644 (file)
--- a/src/main/java/de/juplo/kafka/chat/backend/implementation/StorageStrategy.java
+++ b/src/main/java/de/juplo/kafka/chat/backend/implementation/StorageStrategy.java
@@ -8,6 +8,8 @@ import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Flux;
 
 import java.util.UUID;
+import java.util.concurrent.Phaser;
+import java.util.concurrent.atomic.AtomicInteger;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 
@@ -18,33 +20,54 @@ public interface StorageStrategy
 
   default void write(ChatHomeService chatHomeService)
   {
+    Phaser writtenChatRooms = new Phaser(1);
+    AtomicInteger numErrors = new AtomicInteger();
+
     writeChatRoomInfo(
         chatHomeService
             .getChatRoomInfo()
-            .doOnNext(chatRoomInfo ->
-                writeChatRoomData(
-                    chatRoomInfo.getId(),
-                    chatHomeService
-                        .getChatRoomData(chatRoomInfo.getId())
-                        .flatMapMany(chatRoomData -> chatRoomData.getMessages()))));
-  }
+            .doOnNext(chatRoomInfo -> writtenChatRooms.register())
+            .doOnNext(chatRoomInfo -> writeChatRoomData(
+                chatRoomInfo.getId(),
+                chatHomeService
+                    .getChatRoomData(chatRoomInfo.getId())
+                    .flatMapMany(chatRoomData -> chatRoomData.getMessages()),
+                (chatRoomId) ->
+                {
+                  logSuccess(chatRoomId);
+                  writtenChatRooms.arriveAndDeregister();
+                },
+                (chatRoomId, throwable) ->
+                {
+                  logFailure(chatRoomId, throwable);
+                  numErrors.incrementAndGet();
+                  writtenChatRooms.arriveAndDeregister();
+                })));
 
-  default void writeChatRoomData(UUID chatRoomId, Flux<Message> messageFlux)
-  {
-    writeChatRoomData(
-        chatRoomId,
-        messageFlux,
-        (id) -> logSuccess(id),
-        (id, throwable) -> logFailure(id, throwable));
+    writtenChatRooms.arriveAndAwaitAdvance();
+    if (numErrors.get() > 0)
+    {
+      throw new RuntimeException("Could not write all chat-rooms for " + chatHomeService);
+    }
+
+    log.info("All chat-rooms were written successfully for {}", chatHomeService);
   }
 
   void writeChatRoomInfo(Flux<ChatRoomInfo> chatRoomInfoFlux);
   Flux<ChatRoomInfo> readChatRoomInfo();
-  void writeChatRoomData(
+  default void writeChatRoomData(
       UUID chatRoomId,
       Flux<Message> messageFlux,
-      SuccessCallback callback,
-      FailureCallback failureCallback);
+      SuccessCallback successCallback,
+      FailureCallback failureCallback)
+  {
+    writeChatRoomData(
+        chatRoomId,
+        messageFlux
+            .doOnComplete(() -> successCallback.accept(chatRoomId))
+            .doOnError(throwable -> failureCallback.accept(chatRoomId, throwable)));
+  }
+  void writeChatRoomData(UUID chatRoomId, Flux<Message> messageFlux);
   Flux<Message> readChatRoomData(UUID chatRoomId);
 
   interface SuccessCallback extends Consumer<UUID> {}