From be19e57b61897026d4419f8e43c7e823f562480f Mon Sep 17 00:00:00 2001
From: pricelees <priceelees@gmail.com>
Date: Sun, 28 Sep 2025 13:12:47 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20StartTime=20=EA=B8=B0=EB=A1=9D=EC=9A=A9?=
 =?UTF-8?q?=20MDC=20=EC=9C=A0=ED=8B=B8=20=EB=B0=8F=20=ED=85=8C=EC=8A=A4?=
 =?UTF-8?q?=ED=8A=B8=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../sangdol/common/utils/MdcStartTimeUtil.kt  | 25 ++++++++++++++
 .../common/utils/MdcPrincipalIdUtilTest.kt    |  2 +-
 .../common/utils/MdcStartTimeUtilTest.kt      | 34 +++++++++++++++++++
 3 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 common/utils/src/main/kotlin/com/sangdol/common/utils/MdcStartTimeUtil.kt
 create mode 100644 common/utils/src/test/kotlin/com/sangdol/common/utils/MdcStartTimeUtilTest.kt

diff --git a/common/utils/src/main/kotlin/com/sangdol/common/utils/MdcStartTimeUtil.kt b/common/utils/src/main/kotlin/com/sangdol/common/utils/MdcStartTimeUtil.kt
new file mode 100644
index 00000000..0e15ecfe
--- /dev/null
+++ b/common/utils/src/main/kotlin/com/sangdol/common/utils/MdcStartTimeUtil.kt
@@ -0,0 +1,25 @@
+package com.sangdol.common.utils
+
+import org.slf4j.MDC
+
+object MdcStartTimeUtil {
+    const val MDC_START_TIME_KEY = "start_time"
+
+    fun extractDurationMsOrNull(): Long? {
+        return extractOrNull()?.let { System.currentTimeMillis() - it }
+    }
+
+    fun setCurrentTime() {
+        extractOrNull() ?: run {
+            MDC.put(MDC_START_TIME_KEY, System.currentTimeMillis().toString())
+        }
+    }
+
+    fun clear() {
+        MDC.remove(MDC_START_TIME_KEY)
+    }
+
+    private fun extractOrNull(): Long? {
+        return MDC.get(MDC_START_TIME_KEY)?.toLong()
+    }
+}
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
index 388c61d8..043d4646 100644
--- a/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtilTest.kt
+++ b/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcPrincipalIdUtilTest.kt
@@ -25,4 +25,4 @@ class MdcPrincipalIdUtilTest : StringSpec({
             MdcPrincipalIdUtil.extractAsOptionalLongOrEmpty() shouldBe Optional.empty()
         }
     }
-})
\ No newline at end of file
+})
diff --git a/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcStartTimeUtilTest.kt b/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcStartTimeUtilTest.kt
new file mode 100644
index 00000000..0f57e753
--- /dev/null
+++ b/common/utils/src/test/kotlin/com/sangdol/common/utils/MdcStartTimeUtilTest.kt
@@ -0,0 +1,34 @@
+package com.sangdol.common.utils
+
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.nulls.shouldNotBeNull
+import io.kotest.matchers.shouldBe
+
+class MdcStartTimeUtilTest : FunSpec({
+
+    test("기존에 등록된 startTime 값을 기준으로 duration_ms를 구한다.") {
+        MdcStartTimeUtil.setCurrentTime()
+        MdcStartTimeUtil.extractDurationMsOrNull().shouldNotBeNull()
+        MdcStartTimeUtil.clear()
+    }
+
+    test("기존에 등록된 startTime 값이 없으면 duration_ms는 null이다.") {
+        MdcStartTimeUtil.extractDurationMsOrNull() shouldBe null
+    }
+
+    test("현재 시간을 등록한다.") {
+        MdcStartTimeUtil.setCurrentTime()
+        MdcStartTimeUtil.extractDurationMsOrNull().shouldNotBeNull()
+        MdcStartTimeUtil.clear()
+    }
+
+    test("등록된 시간을 지운다.") {
+        MdcStartTimeUtil.setCurrentTime().also {
+            MdcStartTimeUtil.extractDurationMsOrNull().shouldNotBeNull()
+        }
+
+        MdcStartTimeUtil.clear().also {
+            MdcStartTimeUtil.extractDurationMsOrNull() shouldBe null
+        }
+    }
+})