sidecar enhance

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/NacosDiscoveryProperties.java

@@ -30,6 +30,7 @@ import java.util.regex.Pattern;
 import javax.annotation.PostConstruct;
 import javax.annotation.PreDestroy;
 
+import com.alibaba.nacos.api.exception.NacosException;
 import com.alibaba.nacos.api.naming.NamingMaintainService;
 import com.alibaba.nacos.api.naming.NamingService;
 import com.alibaba.nacos.api.naming.PreservedMetadataKeys;
@@ -273,10 +274,10 @@ public class NacosDiscoveryProperties {
 		this.namingMaintainService = createMaintainService(properties);
 	}
 
-	@PreDestroy
-	public void destroy() {
-
-	}
+    @PreDestroy
+    public void destroy() throws NacosException {
+        namingService.shutDown();
+    }
 
 	public String getEndpoint() {
 		return endpoint;

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-sidecar/src/main/java/com/alibaba/cloud/sidecar/SidecarHealthChecker.java

@@ -16,6 +16,9 @@
 
 package com.alibaba.cloud.sidecar;
 
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.TimeUnit;
 
 import org.slf4j.Logger;
@@ -28,11 +31,14 @@ import org.springframework.core.env.ConfigurableEnvironment;
 
 /**
  * @author www.itmuch.com
+ * @author yuhuangbin
  */
 public class SidecarHealthChecker {
 
 	private static final Logger log = LoggerFactory.getLogger(SidecarHealthChecker.class);
 
+	private final Map<String, SidecarInstanceCache> sidecarInstanceCacheMap = new ConcurrentHashMap<>();
+
 	private final SidecarDiscoveryClient sidecarDiscoveryClient;
 
 	private final HealthIndicator healthIndicator;
@@ -52,26 +58,60 @@ public class SidecarHealthChecker {
 
 	public void check() {
 		Schedulers.single().schedulePeriodically(() -> {
+			String applicationName = environment.getProperty("spring.application.name");
 			String ip = sidecarProperties.getIp();
 			Integer port = sidecarProperties.getPort();
 
 			Status status = healthIndicator.health().getStatus();
-			String applicationName = environment.getProperty("spring.application.name");
 
+			instanceCache(applicationName, ip, port, status);
 			if (status.equals(Status.UP)) {
-				this.sidecarDiscoveryClient.registerInstance(applicationName, ip, port);
-				log.debug(
-						"Health check success. register this instance. applicationName = {}, ip = {}, port = {}, status = {}",
-						applicationName, ip, port, status);
+				if (needRegister(applicationName, ip, port, status)) {
+					this.sidecarDiscoveryClient.registerInstance(applicationName, ip,
+							port);
+					log.info(
+							"Polyglot service changed and Health check success. register the new instance. applicationName = {}, ip = {}, port = {}, status = {}",
+							applicationName, ip, port, status);
+				}
 			}
 			else {
 				log.warn(
 						"Health check failed. unregister this instance. applicationName = {}, ip = {}, port = {}, status = {}",
 						applicationName, ip, port, status);
 				this.sidecarDiscoveryClient.deregisterInstance(applicationName, ip, port);
+
+				sidecarInstanceCacheMap.put(applicationName,
+						buildCache(ip, port, status));
 			}
 
 		}, 0, sidecarProperties.getHealthCheckInterval(), TimeUnit.MILLISECONDS);
 	}
 
+	private void instanceCache(String applicationName, String ip, Integer port,
+			Status status) {
+		sidecarInstanceCacheMap.putIfAbsent(applicationName,
+				buildCache(ip, port, status));
+	}
+
+	private boolean needRegister(String applicationName, String ip, Integer port,
+			Status status) {
+		SidecarInstanceCache cacheRecord = sidecarInstanceCacheMap.get(applicationName);
+		SidecarInstanceCache cache = buildCache(ip, port, status);
+
+		if (!Objects.equals(cache, cacheRecord)) {
+			// modify the cache info
+			sidecarInstanceCacheMap.put(applicationName, cache);
+			return true;
+		}
+		return false;
+	}
+
+	private SidecarInstanceCache buildCache(String ip, Integer port, Status status) {
+		SidecarInstanceCache cache = new SidecarInstanceCache();
+		cache.setIp(ip);
+		cache.setPort(port);
+		cache.setStatus(status);
+		return cache;
+	}
+
 }

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-sidecar/src/main/java/com/alibaba/cloud/sidecar/SidecarInstanceCache.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2013-2018 the original author or 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
+ *
+ *      https://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.sidecar;
+
+import java.util.Objects;
+
+import org.springframework.boot.actuate.health.Status;
+
+/**
+ * @author yuhuangbin
+ */
+public class SidecarInstanceCache {
+
+	private String ip;
+
+	private Integer port;
+
+	private Status status;
+
+	public String getIp() {
+		return ip;
+	}
+
+	public void setIp(String ip) {
+		this.ip = ip;
+	}
+
+	public Integer getPort() {
+		return port;
+	}
+
+	public void setPort(Integer port) {
+		this.port = port;
+	}
+
+	public Status getStatus() {
+		return status;
+	}
+
+	public void setStatus(Status status) {
+		this.status = status;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		SidecarInstanceCache that = (SidecarInstanceCache) o;
+		return Objects.equals(ip, that.ip) && Objects.equals(port, that.port)
+				&& Objects.equals(status, that.status);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(ip, port, status);
+	}
+
+}