feat : PromiseRegisterEventHandler 구현 (#88)

Whatnow-Domain/src/main/kotlin/com/depromeet/whatnow/domains/promise/domain/Promise.kt

@@ -46,7 +46,7 @@ class Promise(
 ) : BaseTimeEntity() {
     @PostPersist
     fun createPromiseEvent() {
-        Events.raise(PromiseRegisterEvent(this.id!!))
+        Events.raise(PromiseRegisterEvent(this.id!!, this.mainUserId))
     }
     fun updateTitle(title: String) {
         this.title = title

Whatnow-Domain/src/main/kotlin/com/depromeet/whatnow/events/domainEvent/PromiseRegisterEvent.kt

@@ -4,4 +4,5 @@ import com.depromeet.whatnow.common.aop.event.DomainEvent
 
 class PromiseRegisterEvent(
     val promiseId: Long,
+    val userId: Long,
 ) : DomainEvent()

Whatnow-Domain/src/main/kotlin/com/depromeet/whatnow/events/handler/PromiseRegisterEventHandler.kt

@@ -1,3 +1,25 @@
 package com.depromeet.whatnow.events.handler
 
-class PromiseRegisterEventHandler
+import com.depromeet.whatnow.annotation.Handler
+import com.depromeet.whatnow.domains.promiseuser.domain.PromiseUser
+import com.depromeet.whatnow.domains.promiseuser.service.PromiseUserDomainService
+import com.depromeet.whatnow.events.domainEvent.PromiseRegisterEvent
+import org.springframework.scheduling.annotation.Async
+import org.springframework.transaction.event.TransactionPhase
+import org.springframework.transaction.event.TransactionalEventListener
+
+@Handler
+class PromiseRegisterEventHandler(
+    val promiseUserDomainService: PromiseUserDomainService,
+) {
+    @Async
+    @TransactionalEventListener(classes = [PromiseRegisterEvent::class], phase = TransactionPhase.AFTER_COMMIT)
+    fun handleRegisterPictureEvent(promiseRegisterEvent: PromiseRegisterEvent) {
+        // 약속 등록 시 방장의 PromiseUser 생성하기
+        val promiseUser = PromiseUser(
+            promiseId = promiseRegisterEvent.promiseId,
+            userId = promiseRegisterEvent.userId,
+        )
+        promiseUserDomainService.createPromiseUser(promiseUser)
+    }
+}