Automatically rebuild the state after a crash / restart

[demos/kafka/demos-kafka-payment-system-transfer] / src / main / java / de / juplo / kafka / payment / transfer / domain / TransferService.java

diff --git a/src/main/java/de/juplo/kafka/payment/transfer/domain/TransferService.java b/src/main/java/de/juplo/kafka/payment/transfer/domain/TransferService.java
index 90ef682..00c5478 100644 (file)
--- a/src/main/java/de/juplo/kafka/payment/transfer/domain/TransferService.java
+++ b/src/main/java/de/juplo/kafka/payment/transfer/domain/TransferService.java
@@ -1,10 +1,7 @@
 package de.juplo.kafka.payment.transfer.domain;
 
 
-import de.juplo.kafka.payment.transfer.ports.GetTransferUseCase;
-import de.juplo.kafka.payment.transfer.ports.HandleTransferUseCase;
-import de.juplo.kafka.payment.transfer.ports.MessagingService;
-import de.juplo.kafka.payment.transfer.ports.TransferRepository;
+import de.juplo.kafka.payment.transfer.ports.*;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
@@ -16,12 +13,13 @@ import static de.juplo.kafka.payment.transfer.domain.Transfer.State.CREATED;
 
 @Slf4j
 @RequiredArgsConstructor
-public class TransferService implements HandleTransferUseCase, GetTransferUseCase
+public class TransferService implements CreateTransferUseCase, HandleStateChangeUseCase, GetTransferUseCase
 {
   private final TransferRepository repository;
   private final MessagingService messagingService;
 
-  private void create(Transfer transfer)
+  @Override
+  public void create(Transfer transfer)
   {
     repository
         .get(transfer.getId())
@@ -29,9 +27,9 @@ public class TransferService implements HandleTransferUseCase, GetTransferUseCas
             stored -> log.info("transfer already exisits: {}, ignoring: {}", stored, transfer),
             () ->
             {
+              log.info("creating transfer: {}", transfer);
               repository.store(transfer);
-              transfer.setState(CREATED);
-              messagingService.send(transfer);
+              messagingService.send(transfer.getId(), CREATED);
             });
   }
 
@@ -41,11 +39,6 @@ public class TransferService implements HandleTransferUseCase, GetTransferUseCas
     Transfer.State state = transfer.getState();
     switch (state)
     {
-      case RECEIVED:
-        repository.store(transfer);
-        create(transfer);
-        break;
-
       case CREATED:
         repository.store(transfer);
         check(transfer);
@@ -64,8 +57,7 @@ public class TransferService implements HandleTransferUseCase, GetTransferUseCas
   private void check(Transfer transfer)
   {
     // TODO: Do some time consuming checks...
-    transfer.setState(CHECKED);
-    messagingService.send(transfer);
+    messagingService.send(transfer.getId(), CHECKED);
   }
 
   public Optional<Transfer> get(Long id)