User event handler to OAuth user

test-service/src/main/java/io/bluemoon/testservice/service/user/UserEventListener.java

@@ -1,4 +1,21 @@
 package io.bluemoon.testservice.service.user;
 
+import io.bluemoon.testservice.domain.user.User;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.event.TransactionPhase;
+import org.springframework.transaction.event.TransactionalEventListener;
+
+import java.io.IOException;
+
+@Component
 public class UserEventListener {
+
+    @Async
+    @TransactionalEventListener(phase = TransactionPhase.AFTER_COMMIT, classes = UserServiceImpl.UserCreateEvent.class)
+    public void handle(UserServiceImpl.UserCreateEvent event) throws IOException {
+        User user = event.getUser();
+
+        // oauth
+    }
 }

test-service/src/main/java/io/bluemoon/testservice/service/user/UserService.java

@@ -1,4 +1,8 @@
 package io.bluemoon.testservice.service.user;
 
+import io.bluemoon.testservice.domain.user.User;
+
 public interface UserService {
+
+    User createUser(User user);
 }

test-service/src/main/java/io/bluemoon/testservice/service/user/UserServiceImpl.java

@@ -1,4 +1,44 @@
 package io.bluemoon.testservice.service.user;
 
-public class UserServiceImpl {
+import io.bluemoon.testservice.domain.user.User;
+import io.bluemoon.testservice.domain.user.UserRepository;
+import lombok.Getter;
+import lombok.NonNull;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.context.ApplicationEventPublisherAware;
+import org.springframework.stereotype.Service;
+
+@Service
+public class UserServiceImpl implements UserService, ApplicationEventPublisherAware {
+
+    private UserRepository userRepository;
+    private ApplicationEventPublisher eventPublisher;
+
+    public UserServiceImpl(
+            UserRepository userRepository
+    ) {
+        this.userRepository = userRepository;
+    }
+
+
+    @Override
+    public User createUser(User user) {
+
+        userRepository.save(user);
+        return null;
+    }
+
+    @Override
+    public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
+        this.eventPublisher = applicationEventPublisher;
+    }
+
+    public static class UserCreateEvent {
+        @Getter
+        private User user;
+
+        private UserCreateEvent(@NonNull User user) {
+            this.user = user;
+        }
+    }
 }