Nacos Parameter init listener by conditional on class

spring-cloud-alicloud-context/src/main/java/org/springframework/cloud/alicloud/context/nacos/NacosParameterInitListener.java

@@ -3,27 +3,33 @@ package org.springframework.cloud.alicloud.context.nacos;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
-import org.springframework.context.ApplicationListener;
+import org.springframework.cloud.alicloud.context.listener.AbstractOnceApplicationListener;
 
 import com.alibaba.cloud.context.edas.EdasChangeOrderConfiguration;
 import com.alibaba.cloud.context.edas.EdasChangeOrderConfigurationFactory;
 
 public class NacosParameterInitListener
-		implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {
+		extends AbstractOnceApplicationListener<ApplicationEnvironmentPreparedEvent> {
 	private static final Logger log = LoggerFactory
 			.getLogger(NacosParameterInitListener.class);
 
 	@Override
-	public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
+	protected String conditionalOnClass() {
+		return "org.springframework.cloud.alibaba.nacos.NacosConfigAutoConfiguration";
+	}
 
+	@Override
+	protected void handleEvent(ApplicationEnvironmentPreparedEvent event) {
 		preparedNacosConfiguration();
 	}
 
 	private void preparedNacosConfiguration() {
 		EdasChangeOrderConfiguration edasChangeOrderConfiguration = EdasChangeOrderConfigurationFactory
 				.getEdasChangeOrderConfiguration();
+
 		log.info("Initialize Nacos Parameter from edas change order,is edas managed {}.",
 				edasChangeOrderConfiguration.isEdasManaged());
+
 		if (!edasChangeOrderConfiguration.isEdasManaged()) {
 			return;
 		}