fix(): 优化代码以及增加DateUtil测试类

apollo-client/src/main/java/com/ctrip/framework/apollo/internals/ConfigMonitorInitializer.java

@@ -103,8 +103,7 @@ private static void initializeMetricsEventListener() {
 
   private static void initializeMetricsExporter(
   ) {
-    if (StringUtils.isEmpty(m_configUtil.getMonitorExternalType()) || "NONE".equals(m_configUtil.
-            getMonitorExternalType())) {
+    if (StringUtils.isBlank(m_configUtil.getMonitorExternalType())) {
       return;
     }
     ApolloClientMetricsExporterFactory exporterFactory = ApolloInjector.getInstance(

apollo-client/src/main/java/com/ctrip/framework/apollo/monitor/internal/listener/impl/DefaultApolloClientBootstrapArgsApi.java

@@ -23,6 +23,7 @@
 
 import com.ctrip.framework.apollo.Apollo;
 import com.ctrip.framework.apollo.core.utils.DeferredLoggerFactory;
+import com.ctrip.framework.apollo.core.utils.StringUtils;
 import com.ctrip.framework.apollo.monitor.api.ApolloClientBootstrapArgsMonitorApi;
 import com.ctrip.framework.apollo.monitor.internal.jmx.mbean.ApolloClientJmxBootstrapArgsMBean;
 import com.ctrip.framework.apollo.monitor.internal.listener.AbstractApolloClientMonitorEventListener;
@@ -33,6 +34,8 @@
 
 import java.time.LocalDateTime;
 import java.util.Map;
+import java.util.Optional;
+
 import org.slf4j.Logger;
 
 /**
@@ -76,7 +79,8 @@ public DefaultApolloClientBootstrapArgsApi(ConfigUtil configUtil) {
     putAttachmentValue(APP_ID, configUtil.getAppId());
     putAttachmentValue(ENV, configUtil.getApolloEnv());
     putAttachmentValue(VERSION, Apollo.VERSION);
-    putAttachmentValue(META_FRESH, DateUtil.formatLocalDateTime(LocalDateTime.now()));
+    Optional<String> date = DateUtil.formatLocalDateTime(LocalDateTime.now());
+    date.ifPresent(s -> putAttachmentValue(META_FRESH, s));
     putAttachmentValue(CONFIG_SERVICE_URL,"");
 
   }
@@ -92,8 +96,11 @@ public void collect0(ApolloClientMonitorEvent event) {
   }
 
   private void putAttachmentValue(String argName, Object value) {
+    if(StringUtils.isBlank(argName) || value == null) {
+      return;
+    }
     bootstrapArgs.put(argName, value);
-    bootstrapArgsString.put(argName, value == null ? null : value.toString());
+    bootstrapArgsString.put(argName, value.toString());
   }
 
   @Override

apollo-client/src/main/java/com/ctrip/framework/apollo/monitor/internal/listener/impl/DefaultApolloClientNamespaceApi.java

@@ -36,6 +36,7 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import org.slf4j.Logger;
 
@@ -183,7 +184,8 @@ public Map<String, NamespaceMetricsString> getNamespaceMetricsString() {
     namespaces.forEach((namespace, metrics) -> {
       NamespaceMetricsString namespaceMetricsString = new NamespaceMetricsString();
       namespaceMetricsString.setFirstLoadTimeSpendInMs(metrics.getFirstLoadTimeSpendInMs());
-      namespaceMetricsString.setLatestUpdateTime(DateUtil.formatLocalDateTime(metrics.getLatestUpdateTime()));
+      Optional<String> date = DateUtil.formatLocalDateTime(metrics.getLatestUpdateTime());
+      date.ifPresent(namespaceMetricsString::setLatestUpdateTime);
       namespaceMetricsString.setUsageCount(metrics.getUsageCount());
       namespaceMetricsString.setReleaseKey(metrics.getReleaseKey());
       namespaceMetricsStringMap.put(namespace, namespaceMetricsString);

apollo-client/src/main/java/com/ctrip/framework/apollo/monitor/internal/tracer/ApolloClientMonitorMessageProducer.java

@@ -32,6 +32,7 @@
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 
 /**
  * @author Rawven
@@ -123,10 +124,11 @@ private void publishConfigChangeEvent(String name) {
   }
 
   private void publishMetaServiceEvent() {
+    Optional<String> date = DateUtil.formatLocalDateTime(LocalDateTime.now());
     ApolloClientMonitorEventPublisher.publish(
         ApolloClientMonitorEventFactory.getInstance().createEvent(META_FRESH)
             .withTag(TAG_BOOTSTRAP)
-            .putAttachment(META_FRESH, DateUtil.formatLocalDateTime(LocalDateTime.now())));
+            .putAttachment(META_FRESH, date.orElse("")));
   }
 
   private void publishConfigServiceEvent(String name) {

apollo-client/src/main/java/com/ctrip/framework/apollo/util/ConfigUtil.java

@@ -74,7 +74,7 @@ public class ConfigUtil {
   private boolean propertyKubernetesCacheEnabled = false;
   private boolean clientMonitorEnabled = false;
   private boolean clientMonitorJmxEnabled = false;
-  private String monitorExternalType = "NONE";
+  private String monitorExternalType = "";
   private long monitorExternalExportPeriod = 10;
   private int monitorExceptionQueueSize = 25;
 
@@ -556,7 +556,7 @@ private void initClientMonitorExternalType() {
     monitorExternalType = System.getProperty(ApolloClientSystemConsts.APOLLO_CLIENT_MONITOR_EXTERNAL_TYPE);
     if (Strings.isNullOrEmpty(monitorExternalType)) {
       monitorExternalType = Foundation.app()
-              .getProperty(ApolloClientSystemConsts.APOLLO_CLIENT_MONITOR_EXTERNAL_TYPE, "NONE");
+              .getProperty(ApolloClientSystemConsts.APOLLO_CLIENT_MONITOR_EXTERNAL_TYPE, "");
     }
   }
 

apollo-client/src/main/java/com/ctrip/framework/apollo/util/date/DateUtil.java

@@ -18,6 +18,7 @@
 
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
+import java.util.Optional;
 
 /**
  * @author Rawven
@@ -32,7 +33,8 @@ public class DateUtil {
 	 * @param localDateTime the LocalDateTime to format, can be null
 	 * @return the formatted date-time string, or null if the input is null
 	 */
-	public static String formatLocalDateTime(LocalDateTime localDateTime) {
-		return localDateTime != null ? localDateTime.format(MEDIUM_FORMATTER) : null;
+	public static Optional<String> formatLocalDateTime(LocalDateTime localDateTime) {
+		return Optional.ofNullable(localDateTime)
+				.map(dt -> dt.format(MEDIUM_FORMATTER));
 	}
 }

apollo-client/src/test/java/com/ctrip/framework/apollo/util/date/DateUtilTest.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2022 Apollo Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+package com.ctrip.framework.apollo.util.date;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+import java.time.LocalDateTime;
+import java.util.Optional;
+
+public class DateUtilTest {
+
+    @Test
+    public void testFormatLocalDateTime_validDate() {
+        LocalDateTime dateTime = LocalDateTime.of(2024, 12, 1, 10, 30, 0);
+
+        Optional<String> formattedDate = DateUtil.formatLocalDateTime(dateTime);
+
+        assertTrue(formattedDate.isPresent()); 
+        assertEquals("2024-12-01 10:30:00", formattedDate.get());
+    }
+
+    @Test
+    public void testFormatLocalDateTime_nullDate() {
+        Optional<String> result = DateUtil.formatLocalDateTime(null);
+
+        assertFalse(result.isPresent()); 
+    }
+}