refactor(nacos): Modify nacos service caching mechanism

spring-cloud-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/NacosNamingManager.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.alibaba.cloud.nacos;
+
+import com.alibaba.nacos.api.naming.NamingMaintainService;
+import com.alibaba.nacos.api.naming.NamingService;
+import org.springframework.beans.BeansException;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+
+/**
+ * @author <a href="mailto:liaochunyhm@live.com">liaochuntao</a>
+ * @since
+ */
+public class NacosNamingManager implements ApplicationContextAware {
+
+    private NamingService namingService;
+    private NamingMaintainService namingMaintainService;
+
+    public NamingService getNamingService() {
+        return namingService;
+    }
+
+    public NamingMaintainService getNamingMaintainService() {
+        return namingMaintainService;
+    }
+
+    @Override
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+        NacosDiscoveryProperties properties = applicationContext.getBean(NacosDiscoveryProperties.class);
+        namingService = properties.namingServiceInstance();
+        namingMaintainService = properties.namingMaintainServiceInstance();
+    }
+}