feat: #176 인증 메일 발송 메서드 비동기 처리

src/main/java/com/server/capple/CappleApplication.java

@@ -7,6 +7,7 @@
 import org.springframework.cache.annotation.EnableCaching;
 import org.springframework.cloud.openfeign.EnableFeignClients;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+import org.springframework.scheduling.annotation.EnableAsync;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
 import java.time.ZoneId;
@@ -18,6 +19,7 @@
 @EnableConfigurationProperties
 @EnableScheduling
 @EnableCaching
+@EnableAsync
 public class CappleApplication {
 
 	public static void main(String[] args) {

src/main/java/com/server/capple/domain/mail/service/MailServiceImpl.java

@@ -7,8 +7,10 @@
 import com.server.capple.global.exception.RestApiException;
 import com.server.capple.global.exception.errorCode.MailErrorCode;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
+@Slf4j
 @Service
 @RequiredArgsConstructor
 public class MailServiceImpl implements MailService {
@@ -19,9 +21,12 @@ public class MailServiceImpl implements MailService {
 
     @Override
     public Boolean sendMailAddressCertificationMail(String email, Boolean isWhiteList) {
-        String certCode = mailUtil.sendMailAddressCertificationMail(email, isWhiteList);
-        String emailJwt = jwtService.createJwtFromEmail(email);
-        return mailRedisRepository.save(emailJwt, certCode);
+        mailUtil.sendMailAddressCertificationMail(email, isWhiteList).thenAccept(certCode -> {
+            String emailJwt = jwtService.createJwtFromEmail(email);
+            mailRedisRepository.save(emailJwt, certCode);
+            log.info("메일 발송 완료 : {}", email);
+        });
+        return true;
     }
 
     @Override

src/main/java/com/server/capple/domain/mail/service/MailUtil.java

@@ -1,10 +1,12 @@
 package com.server.capple.domain.mail.service;
 
+import java.util.concurrent.CompletableFuture;
+
 public interface MailUtil {
     public static Boolean emailAddressFormVerification(String emailAddress) {
         String emailRegex = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,6}$";
         return emailAddress.matches(emailRegex);
     }
 
-    String sendMailAddressCertificationMail(String receiver, Boolean isWhiteList);
+    CompletableFuture<String> sendMailAddressCertificationMail(String receiver, Boolean isWhiteList);
 }

src/main/java/com/server/capple/domain/mail/service/MailUtilImpl.java

@@ -5,13 +5,18 @@
 import jakarta.mail.MessagingException;
 import jakarta.mail.internet.MimeMessage;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Component;
 import org.thymeleaf.TemplateEngine;
 import org.thymeleaf.context.Context;
 
+import java.util.concurrent.CompletableFuture;
+
+@Slf4j
 @Component
 @RequiredArgsConstructor
 public class MailUtilImpl implements MailUtil {
@@ -20,19 +25,21 @@ public class MailUtilImpl implements MailUtil {
     @Value("${mail.white-list-cert-code}")
     private String whiteListCertCode;
 
+    @Async
     @Override
-    public String sendMailAddressCertificationMail(String receiver, Boolean isWhiteList) {
+    public CompletableFuture<String> sendMailAddressCertificationMail(String receiver, Boolean isWhiteList) {
         String certCode = generateCertCode();
-        if(isWhiteList) certCode = whiteListCertCode;
+        if (isWhiteList) certCode = whiteListCertCode;
         MimeMessage mimeMessage = javaMailSender.createMimeMessage();
         try {
             MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, false, "UTF-8");
             mimeMessageHelper.setTo(receiver);
             mimeMessageHelper.setSubject("[Capple] 회원가입 인증코드 안내");
             mimeMessageHelper.setText(setCertMailContext(certCode), true);
             javaMailSender.send(mimeMessage);
-            return certCode;
+            return CompletableFuture.completedFuture(certCode);
         } catch (MessagingException e) {
+            log.error(MailErrorCode.MULTI_PART_CRAETION_FAILED.getMessage());
             throw new RestApiException(MailErrorCode.MULTI_PART_CRAETION_FAILED);
         }
     }