fix reactor concurrent bug when get instances (#774)

CHANGELOG.md

@@ -21,4 +21,5 @@
 - [Optimize: change RouteArgument.buildCustom to RouteArgument.fromLabel](https://github.com/Tencent/spring-cloud-tencent/pull/749)
 - [Optimize: get service instances by Flux.blockLast() to resolve concurrent problem](https://github.com/Tencent/spring-cloud-tencent/pull/764)
 - [Fix issue: prompt no registration if web dependence was not imported.](https://github.com/Tencent/spring-cloud-tencent/pull/772)
+- [Bugfix: fix reactor concurrent bug when get instances & fix spring-retry fuse not working bug](https://github.com/Tencent/spring-cloud-tencent/pull/774)
 - [Standardize the name of method to create bean.](https://github.com/Tencent/spring-cloud-tencent/pull/779)

spring-cloud-tencent-commons/src/main/java/com/tencent/cloud/common/pojo/PolarisServiceInstance.java

@@ -19,6 +19,7 @@ package com.tencent.cloud.common.pojo;
 
 import java.net.URI;
 import java.util.Map;
+import java.util.Objects;
 
 import com.tencent.polaris.api.pojo.Instance;
 import org.apache.commons.lang.StringUtils;
@@ -93,4 +94,21 @@ public class PolarisServiceInstance implements ServiceInstance {
 	public String getScheme() {
 		return this.scheme;
 	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) {
+			return true;
+		}
+		if (o == null || getClass() != o.getClass()) {
+			return false;
+		}
+		PolarisServiceInstance that = (PolarisServiceInstance) o;
+		return Objects.equals(instance, that.instance) && Objects.equals(scheme, that.scheme);
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(instance, scheme);
+	}
 }

spring-cloud-tencent-polaris-loadbalancer/src/main/java/com/tencent/cloud/polaris/loadbalancer/LoadBalancerUtils.java

@@ -18,8 +18,12 @@
 
 package com.tencent.cloud.polaris.loadbalancer;
 
-import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
 
 import com.tencent.cloud.common.metadata.MetadataContext;
 import com.tencent.cloud.common.pojo.PolarisServiceInstance;
@@ -28,6 +32,8 @@ import com.tencent.polaris.api.pojo.DefaultServiceInstances;
 import com.tencent.polaris.api.pojo.Instance;
 import com.tencent.polaris.api.pojo.ServiceInstances;
 import com.tencent.polaris.api.pojo.ServiceKey;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import reactor.core.publisher.Flux;
 
 import org.springframework.cloud.client.ServiceInstance;
@@ -39,8 +45,10 @@ import org.springframework.util.CollectionUtils;
  * @author lepdou 2022-05-17
  */
 public final class LoadBalancerUtils {
+	private static final Logger LOGGER = LoggerFactory.getLogger(LoadBalancerUtils.class);
 
 	private static final int DEFAULT_WEIGHT = 100;
+	private static final int WAIT_TIME = 3;
 
 	private LoadBalancerUtils() {
 	}
@@ -52,21 +60,33 @@ public final class LoadBalancerUtils {
 	 * @return ServiceInstances
 	 */
 	public static ServiceInstances transferServersToServiceInstances(Flux<List<ServiceInstance>> servers) {
-		List<ServiceInstance> serviceInstances = servers.blockLast();
+		CountDownLatch latch = new CountDownLatch(1);
 
-		List<Instance> instances = new ArrayList<>();
-		if (!CollectionUtils.isEmpty(serviceInstances)) {
-			for (ServiceInstance serviceInstance : serviceInstances) {
-				instances.add(transferServerToServiceInstance(serviceInstance));
-			}
+		AtomicReference<List<Instance>> instancesRef = new AtomicReference<>();
+		servers.subscribe(serviceInstances -> {
+			instancesRef.set(serviceInstances
+					.stream()
+					.map(LoadBalancerUtils::transferServerToServiceInstance)
+					.collect(Collectors.toList()));
+
+			latch.countDown();
+		});
+
+		try {
+			latch.await(WAIT_TIME, TimeUnit.SECONDS);
+		}
+		catch (InterruptedException e) {
+			LOGGER.error("Wait get instance result error. ", e);
 		}
 
-		String serviceName = null;
-		if (!CollectionUtils.isEmpty(instances)) {
-			serviceName = instances.get(0).getService();
+		String serviceName = "";
+		if (!CollectionUtils.isEmpty(instancesRef.get())) {
+			serviceName = instancesRef.get().get(0).getService();
 		}
 
 		ServiceKey serviceKey = new ServiceKey(MetadataContext.LOCAL_NAMESPACE, serviceName);
+		List<Instance> instances = instancesRef.get() == null ? Collections.emptyList() : instancesRef.get();
+
 		return new DefaultServiceInstances(serviceKey, instances);
 	}