refactor: MDCAwareSlowQueryListenerWithoutParams 에서 변환, 검증로직 클래스 분리 및 테스트 추가

src/main/kotlin/roomescape/common/log/MDCAwareSlowQueryListenerWithoutParams.kt

@@ -4,26 +4,38 @@ import net.ttddyy.dsproxy.ExecutionInfo
 import net.ttddyy.dsproxy.QueryInfo
 import net.ttddyy.dsproxy.listener.logging.SLF4JLogLevel
 import net.ttddyy.dsproxy.listener.logging.SLF4JQueryLoggingListener
+import java.util.function.Predicate
 
-class MDCAwareSlowQueryListenerWithoutParams(
-    private val thresholdMs: Long
-) : SLF4JQueryLoggingListener() {
+class MDCAwareSlowQueryListenerWithoutParams : SLF4JQueryLoggingListener {
+    private val slowQueryPredicate: SlowQueryPredicate
+    private val sqlLogFormatter: SqlLogFormatter
 
-    init {
-        this.logLevel = SLF4JLogLevel.WARN
+    constructor(logLevel: SLF4JLogLevel, thresholdMs: Long) {
+        this.logLevel = logLevel
+        this.slowQueryPredicate = SlowQueryPredicate(thresholdMs)
+        this.sqlLogFormatter = SqlLogFormatter()
     }
 
     override fun afterQuery(
         execInfo: ExecutionInfo,
         queryInfoList: List<QueryInfo>
     ) {
-        if (execInfo.elapsedTime >= thresholdMs) {
+        if (slowQueryPredicate.test(execInfo.elapsedTime)) {
             super.afterQuery(execInfo, queryInfoList)
         }
     }
 
     override fun writeLog(message: String) {
-        val modified = message.replace(Regex("""(,?\s*)Params:\[.*?]"""), "")
-        super.writeLog(modified)
+        super.writeLog(sqlLogFormatter.maskParams(message))
     }
 }
+
+class SqlLogFormatter {
+    fun maskParams(message: String) = message.replace(Regex("""(,?\s*)Params:\[.*?]"""), "")
+}
+
+class SlowQueryPredicate(
+    private val thresholdMs: Long
+) : Predicate<Long> {
+    override fun test(t: Long): Boolean = (t >= thresholdMs)
+}

src/test/kotlin/roomescape/common/log/MDCAwareSlowQueryListenerWithoutParamsTest.kt

@@ -0,0 +1,26 @@
+package roomescape.common.log
+
+import io.kotest.assertions.assertSoftly
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
+
+class MDCAwareSlowQueryListenerWithoutParamsTest : StringSpec({
+    "SQL 메시지에서 Params 항목은 가린다." {
+        val message = """Query:["select * from members m where m.email=?"], Params:[(a@a.a)]"""
+        val expected = """Query:["select * from members m where m.email=?"]"""
+        val result = SqlLogFormatter().maskParams(message)
+
+        result shouldBe expected
+    }
+
+    "입력된 thresholdMs 보다 소요시간이 긴 쿼리를 기록한다." {
+        val slowQueryThreshold = 10L
+        val slowQueryPredicate = SlowQueryPredicate(thresholdMs = slowQueryThreshold)
+
+        assertSoftly(slowQueryPredicate) {
+            it.test(slowQueryThreshold) shouldBe true
+            it.test(slowQueryThreshold + 1) shouldBe true
+            it.test(slowQueryThreshold - 1) shouldBe false
+        }
+    }
+})