feat : AttendeeCacheEvent를 이용해 Attendee를 비동기적으로 캐싱하는 AttendanceServic…

…e 구현 (#62)

src/main/java/gdsc/binaryho/imhere/ImhereApplication.java

@@ -2,7 +2,9 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableAsync;
 
+@EnableAsync
 @SpringBootApplication
 public class ImhereApplication {
 

src/main/java/gdsc/binaryho/imhere/core/lecture/application/AttendeeCacheEvent.java

@@ -0,0 +1,13 @@
+package gdsc.binaryho.imhere.core.lecture.application;
+
+import gdsc.binaryho.imhere.core.lecture.model.StudentIds;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public class AttendeeCacheEvent {
+
+    private final Long lectureId;
+    private final StudentIds studentIds;
+}

src/main/java/gdsc/binaryho/imhere/core/lecture/application/AttendeeCacheService.java

@@ -0,0 +1,24 @@
+package gdsc.binaryho.imhere.core.lecture.application;
+
+import gdsc.binaryho.imhere.core.lecture.application.port.AttendeeCacheRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.scheduling.annotation.Async;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.transaction.event.TransactionPhase;
+import org.springframework.transaction.event.TransactionalEventListener;
+
+@Service
+@RequiredArgsConstructor
+public class AttendeeCacheService {
+
+    private final AttendeeCacheRepository attendeeCacheRepository;
+
+    @Async
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    @TransactionalEventListener(phase = TransactionPhase.AFTER_COMMIT)
+    public void cache(AttendeeCacheEvent event) {
+        attendeeCacheRepository.cache(event.getLectureId(), event.getStudentIds());
+    }
+}

src/main/java/gdsc/binaryho/imhere/core/lecture/model/StudentIds.java

@@ -0,0 +1,18 @@
+package gdsc.binaryho.imhere.core.lecture.model;
+
+import java.util.List;
+import lombok.Getter;
+
+@Getter
+public class StudentIds {
+
+    private final List<Long> studentIds;
+
+    public StudentIds(List<Long> studentIds) {
+        this.studentIds = studentIds;
+    }
+
+    public StudentIds(Long studentId) {
+        this.studentIds = List.of(studentId);
+    }
+}