Switchted to @TransactionalEventListener

[demos/kafka/outbox] / src / main / java / de / juplo / boot / data / jdbc / UserController.java

diff --git a/src/main/java/de/juplo/boot/data/jdbc/UserController.java b/src/main/java/de/juplo/boot/data/jdbc/UserController.java
index 4eb1094..0a4a62f 100644 (file)
--- a/src/main/java/de/juplo/boot/data/jdbc/UserController.java
+++ b/src/main/java/de/juplo/boot/data/jdbc/UserController.java
@@ -2,14 +2,23 @@ package de.juplo.boot.data.jdbc;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.dao.IncorrectResultSizeDataAccessException;
 import org.springframework.http.ResponseEntity;
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.util.StreamUtils;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
 import org.springframework.web.util.UriComponents;
 
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+import java.nio.charset.Charset;
 import java.time.LocalDateTime;
 
+import static de.juplo.boot.data.jdbc.UserEvent.Type.CREATED;
+import static de.juplo.boot.data.jdbc.UserEvent.Type.DELETED;
+
 @RestController
 @Transactional
 @RequestMapping("/users")
@@ -19,10 +28,15 @@ public class UserController {
 
 
     private final UserRepository repository;
+    private final ApplicationEventPublisher publisher;
 
 
-    public UserController(UserRepository repository) {
+    public UserController(
+            UserRepository repository,
+            ApplicationEventPublisher publisher)
+    {
         this.repository = repository;
+        this.publisher = publisher;
     }
 
 
@@ -32,7 +46,12 @@ public class UserController {
             @RequestBody String username) {
         String sanitizedUsername = UserController.sanitize(username);
         User user = new User(sanitizedUsername, LocalDateTime.now(), false);
+
+        // Triggering a unique-error for username prevents persistence
         repository.save(user);
+        publisher.publishEvent(new UserEvent(this, CREATED, sanitizedUsername));
+        user = repository.findByUsername(sanitizedUsername);
+
         UriComponents uri =
             builder
                 .fromCurrentRequest()
@@ -59,6 +78,7 @@ public class UserController {
             return ResponseEntity.notFound().build();
 
         repository.delete(user);
+        publisher.publishEvent(new UserEvent(this, DELETED, username));
 
         return ResponseEntity.ok(user);
     }
@@ -75,4 +95,22 @@ public class UserController {
 
         return string.trim().toLowerCase();
     }
+
+    @ExceptionHandler
+    public ResponseEntity<?> incorrectResultSizeDataAccessException(
+        HttpServletRequest request,
+        IncorrectResultSizeDataAccessException e
+        )
+    {
+      String username;
+      try {
+          username = StreamUtils.copyToString(request.getInputStream(), Charset.defaultCharset());
+      }
+      catch (IOException ioe)
+      {
+        username = e.getMessage() + " -> " + ioe.getMessage();
+      }
+      LOG.info("User {} already exists!", username);
+      return ResponseEntity.badRequest().build();
+    }
 }