From 430630a02b0ee4890886d2ec7666715607bd5b85 Mon Sep 17 00:00:00 2001
From: pricelees <priceelees@gmail.com>
Date: Sat, 27 Sep 2025 20:15:54 +0900
Subject: [PATCH] =?UTF-8?q?refactor:=20MDC=20=EC=9C=A0=ED=8B=B8=20?=
 =?UTF-8?q?=EB=AA=A8=EB=93=88=20=EC=9D=B4=EB=8F=99(service=20->=20common.u?=
 =?UTF-8?q?tils)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 common/utils/build.gradle.kts                 |  5 ++++
 .../common/utils/MdcPrincipalIdUtil.kt        | 26 +++++++++++++++++
 .../common/utils/MdcPrincipalIdUtilTest.kt    | 28 +++++++++++++++++++
 3 files changed, 59 insertions(+)
 create mode 100644 common/utils/build.gradle.kts
 create mode 100644 common/utils/src/main/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtil.kt
 create mode 100644 common/utils/src/test/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtilTest.kt

diff --git a/common/utils/build.gradle.kts b/common/utils/build.gradle.kts
new file mode 100644
index 00000000..ad519ea1
--- /dev/null
+++ b/common/utils/build.gradle.kts
@@ -0,0 +1,5 @@
+dependencies {
+    implementation("org.slf4j:slf4j-api:2.0.17")
+
+    testImplementation("ch.qos.logback:logback-classic:1.5.18")
+}
\ No newline at end of file
diff --git a/common/utils/src/main/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtil.kt b/common/utils/src/main/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtil.kt
new file mode 100644
index 00000000..f96e2b06
--- /dev/null
+++ b/common/utils/src/main/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtil.kt
@@ -0,0 +1,26 @@
+package com.sangdol.common.utils
+
+import org.slf4j.MDC
+import java.util.*
+
+object MdcPrincipalIdUtil {
+    const val MDC_PRINCIPAL_ID_KEY = "principal_id"
+
+    fun extractAsLongOrNull(): Long? {
+        return MDC.get(MDC_PRINCIPAL_ID_KEY)?.toLong()
+    }
+
+    fun extractAsOptionalLongOrEmpty(): Optional<Long> {
+        return MDC.get(MDC_PRINCIPAL_ID_KEY)?.let {
+            Optional.of(it.toLong())
+        } ?: Optional.empty()
+    }
+
+    fun set(id: String) {
+        MDC.put(MDC_PRINCIPAL_ID_KEY, id)
+    }
+
+    fun clear() {
+        MDC.remove(MDC_PRINCIPAL_ID_KEY)
+    }
+}
diff --git a/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtilTest.kt b/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtilTest.kt
new file mode 100644
index 00000000..388c61d8
--- /dev/null
+++ b/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtilTest.kt
@@ -0,0 +1,28 @@
+package com.sangdol.common.utils
+
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
+import java.util.*
+
+class MdcPrincipalIdUtilTest : StringSpec({
+
+    val id = 1872847943L
+
+    "값을 설정한다." {
+        MdcPrincipalIdUtil.set(id.toString()).also {
+            MdcPrincipalIdUtil.extractAsLongOrNull() shouldBe id
+            MdcPrincipalIdUtil.extractAsOptionalLongOrEmpty() shouldBe Optional.of(id)
+        }
+    }
+
+    "값을 제거한다." {
+        MdcPrincipalIdUtil.set(id.toString()).also {
+            MdcPrincipalIdUtil.extractAsLongOrNull() shouldBe id
+        }
+
+        MdcPrincipalIdUtil.clear().also {
+            MdcPrincipalIdUtil.extractAsLongOrNull() shouldBe null
+            MdcPrincipalIdUtil.extractAsOptionalLongOrEmpty() shouldBe Optional.empty()
+        }
+    }
+})
\ No newline at end of file