fix: shutdown thread pool before the container closes (#353)

CHANGELOG.md

@@ -28,3 +28,4 @@
 - [test:update junit of metadata.](https://github.com/Tencent/spring-cloud-tencent/pull/340)
 - [Optimize code style & unit test case](https://github.com/Tencent/spring-cloud-tencent/pull/336)
 - [rm code: Condition 'null != interceptors' is always 'true' ](https://github.com/Tencent/spring-cloud-tencent/pull/342)
+- [fix: shutdown thread pool before the container closes](https://github.com/Tencent/spring-cloud-tencent/pull/353)

spring-cloud-starter-tencent-polaris-discovery/src/main/java/com/tencent/cloud/polaris/discovery/refresh/PolarisRefreshApplicationReadyEventListener.java

@@ -25,6 +25,7 @@ import com.tencent.polaris.client.util.NamedThreadFactory;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import org.springframework.beans.factory.DisposableBean;
 import org.springframework.boot.context.event.ApplicationReadyEvent;
 import org.springframework.cloud.client.discovery.event.HeartbeatEvent;
 import org.springframework.context.ApplicationEventPublisher;
@@ -38,7 +39,7 @@ import static com.tencent.cloud.polaris.discovery.refresh.PolarisServiceStatusCh
  *
  * @author Haotian Zhang
  */
-public class PolarisRefreshApplicationReadyEventListener implements ApplicationListener<ApplicationReadyEvent>, ApplicationEventPublisherAware {
+public class PolarisRefreshApplicationReadyEventListener implements ApplicationListener<ApplicationReadyEvent>, ApplicationEventPublisherAware, DisposableBean {
 
 	private static final Logger LOG = LoggerFactory.getLogger(PolarisRefreshApplicationReadyEventListener.class);
 	private static final int DELAY = 60;
@@ -83,4 +84,9 @@ public class PolarisRefreshApplicationReadyEventListener implements ApplicationL
 	public void setApplicationEventPublisher(ApplicationEventPublisher applicationEventPublisher) {
 		this.publisher = applicationEventPublisher;
 	}
+
+	@Override
+	public void destroy() throws Exception {
+		refreshExecutor.shutdown();
+	}
 }