From 397529301b2f6ca802f7a3d9ddb3f9d7b98de21d Mon Sep 17 00:00:00 2001
From: Rinjae <dearmai@dearmai.net>
Date: Mon, 22 Jun 2026 10:15:44 +0900
Subject: [PATCH] =?UTF-8?q?-=20DamoManager=20singleton=20=EB=A9=94?=
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---
 README.md                                     | 22 +++++++++++++------
 .../java/com/eactive/ext/djb/DamoManager.java | 11 ++++++++++
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index e93aff1..04f7d2a 100644
--- a/README.md
+++ b/README.md
@@ -117,17 +117,24 @@ WAS 기동 시 콘솔(`catalina.out` 또는 stderr)에 다음과 같은 배너
 ```java
 import com.eactive.ext.djb.DamoManager;
 
-DamoManager damo = new DamoManager();    // 클래스 로딩 시점에 모드 감지
+// 기존 방식 유지
+DamoManager damo1 = new DamoManager();
 
-String cipher = damo.encrypt("hello");                       // Base64 cipher text
-String plain  = damo.decrypt(cipher);                        // → "hello"
-String h256   = damo.hash(DamoManager.SHA256, "password");   // SHA-256 base64
-String h512   = damo.hash(DamoManager.SHA512, "password");   // SHA-512 base64
+// singleton 필요 시
+DamoManager damo2 = DamoManager.getInstance();
 
-boolean fake  = damo.isFakeMode();                           // 디버깅 / 분기용
-int     rc    = damo.getReturnCode();                        // 0: 성공, -1: 실패
+String cipher = damo2.encrypt("hello");                      // Base64 cipher text
+String plain  = damo2.decrypt(cipher);                        // -> "hello"
+String h256   = damo2.hash(DamoManager.SHA256, "password");  // SHA-256 base64
+String h512   = damo2.hash(DamoManager.SHA512, "password");  // SHA-512 base64
+
+boolean fake  = damo2.isFakeMode();                          // 디버깅 / 분기용
+int     rc    = damo2.getReturnCode();                       // 0: 성공, -1: 실패
 ```
 
+`new DamoManager()` 와 `DamoManager.getInstance()` 를 함께 지원하므로,
+기존 호출 코드를 변경하지 않고도 singleton 접근 방식으로 점진 전환할 수 있다.
+
 | 메서드 | 운영 동작 | Fake 동작 |
 |---|---|---|
 | `String encrypt(String plain)` | `ScpEncB64(INI_FILE, "KEY1", plain, "UTF-8")` | `Base64.encode(plain.getBytes("UTF-8"))` |
@@ -146,6 +153,7 @@ int     rc    = damo.getReturnCode();                        // 0: 성공, -1: 
 - `Base64Encode(byte[])`, `Base64Decode(String)`
 - `byteToHex(byte[])`, `byteArrayToHex(byte[])`
 - `checkHangul(char)`
+- `getInstance()` (singleton 인스턴스 접근)
 - `getReturnCode()`, `getRevision()`
 
 ## 검증
diff --git a/src/main/java/com/eactive/ext/djb/DamoManager.java b/src/main/java/com/eactive/ext/djb/DamoManager.java
index 3a956af..b968b33 100644
--- a/src/main/java/com/eactive/ext/djb/DamoManager.java
+++ b/src/main/java/com/eactive/ext/djb/DamoManager.java
@@ -63,6 +63,13 @@ public class DamoManager {
     private int nReturn;
     private final RealBridge bridge;
 
+    /**
+     * 기존 생성자 사용은 유지하면서, 공용 singleton 인스턴스가 필요한 경우 사용.
+     */
+    public static DamoManager getInstance() {
+        return SingletonHolder.INSTANCE;
+    }
+
     public DamoManager() {
         if (REAL_MODE) {
             this.bridge = new RealBridge();
@@ -78,6 +85,10 @@ public class DamoManager {
         }
     }
 
+    private static final class SingletonHolder {
+        private static final DamoManager INSTANCE = new DamoManager();
+    }
+
     public String getRevision() {
         return this.szRevision;
     }