Revert "HttpClientConnectionManager에서 SSLContext 생성시, entropy"

This reverts commit 640f1e4f1e.

src/main/java/com/eactive/eai/custom/alarm/ums/UmsService.java

@@ -1,15 +1,20 @@
 package com.eactive.eai.custom.alarm.ums;
 
+import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 
+import javax.annotation.PreDestroy;
+
 import org.apache.hc.client5.http.classic.methods.HttpPost;
 import org.apache.hc.client5.http.config.RequestConfig;
 import org.apache.hc.client5.http.entity.EntityBuilder;
 import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
 import org.apache.hc.client5.http.impl.classic.HttpClients;
+import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder;
+import org.apache.hc.client5.http.io.HttpClientConnectionManager;
 import org.apache.hc.core5.http.ContentType;
-import org.apache.hc.core5.http.HttpVersion;
 import org.apache.hc.core5.http.io.entity.EntityUtils;
+import org.apache.hc.core5.util.TimeValue;
 import org.apache.hc.core5.util.Timeout;
 import org.springframework.stereotype.Component;
 
@@ -38,6 +43,24 @@ public class UmsService {
     private final static String DEFAULT_API_KEY = "7cca6d58-e4f7-474d-9edd-525806bc99ff";
     private final static String AUTHORIZATION_FMT = "Bearer %s";
 
+    // 재사용되는 HttpClient (Thread-Safe)
+    private final CloseableHttpClient httpClient;
+
+    public UmsService() {
+        // 커넥션 풀 설정: 매번 소켓을 열고 닫지 않고 재사용함
+        HttpClientConnectionManager cm = PoolingHttpClientConnectionManagerBuilder.create()
+                .setMaxConnTotal(100)      // 전체 최대 커넥션 수
+                .setMaxConnPerRoute(20)    // 호스트당 최대 커넥션 수
+                .setConnectionTimeToLive(TimeValue.ofMinutes(3))  // TTL
+                .setValidateAfterInactivity(TimeValue.ofSeconds(5)) // 🔥 중요
+                .build();
+
+        this.httpClient = HttpClients.custom()
+                .setConnectionManager(cm)
+                .evictExpiredConnections()                     // 만료 제거
+                .evictIdleConnections(TimeValue.ofSeconds(20)) // 20초 idle 제거
+                .build();
+    }
 
     public UmsCallResult send(UmsRequestPayload payload) throws Exception {
         if (payload.getContent() == null) {
@@ -73,9 +96,6 @@ public class UmsService {
                 .setContentEncoding("UTF-8")
                 .build());
 
-        httpPost.setVersion(HttpVersion.HTTP_1_0);
-        httpPost.setHeader("Connection", "close");
-
         // 3. 타임아웃 설정 (설정파일 값 적용)
         RequestConfig config = RequestConfig.custom()
                 .setConnectTimeout(Timeout.ofMilliseconds(connectionTimeoutMs))
@@ -89,7 +109,7 @@ public class UmsService {
         }
 
         // 4. 실행 (HttpClient 재사용)
-        try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
+        try {
             return httpClient.execute(httpPost, response -> {
                 String body = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
                 
@@ -120,4 +140,15 @@ public class UmsService {
         }
     }
 
+    @PreDestroy
+    public void destroy() {
+        try {
+            if (httpClient != null) {
+                httpClient.close();
+                logger.info("UMS HttpClient closed.");
+            }
+        } catch (IOException e) {
+            logger.error("Error closing UMS HttpClient", e);
+        }
+    }
 }