fix compile error

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/config/PolarisCircuitBreakerAutoConfiguration.java

@@ -22,7 +22,6 @@ import java.util.List;
 
 import com.tencent.cloud.polaris.circuitbreaker.PolarisCircuitBreakerFactory;
 import com.tencent.cloud.polaris.circuitbreaker.common.CircuitBreakerConfigModifier;
-import com.tencent.cloud.polaris.circuitbreaker.resttemplate.PolarisCircuitBreakerRestTemplateBeanPostProcessor;
 import com.tencent.cloud.rpc.enhancement.config.RpcEnhancementAutoConfiguration;
 import com.tencent.cloud.rpc.enhancement.config.RpcEnhancementReporterProperties;
 import com.tencent.polaris.circuitbreak.api.CircuitBreakAPI;
@@ -32,12 +31,9 @@ import com.tencent.polaris.client.api.SDKContext;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.cloud.client.circuitbreaker.CircuitBreakerFactory;
 import org.springframework.cloud.client.circuitbreaker.Customizer;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/config/PolarisCircuitBreakerFeignClientAutoConfiguration.java

@@ -51,6 +51,7 @@ public class PolarisCircuitBreakerFeignClientAutoConfiguration {
 
 	@Bean
 	@ConditionalOnBean(CircuitBreakerFactory.class)
+	@ConditionalOnMissingBean(Targeter.class)
 	public Targeter polarisFeignCircuitBreakerTargeter(CircuitBreakerFactory circuitBreakerFactory, CircuitBreakerNameResolver circuitBreakerNameResolver) {
 		return new PolarisFeignCircuitBreakerTargeter(circuitBreakerFactory, circuitBreakerNameResolver);
 	}
@@ -58,6 +59,7 @@ public class PolarisCircuitBreakerFeignClientAutoConfiguration {
 	@Bean
 	@Scope("prototype")
 	@ConditionalOnBean(CircuitBreakerFactory.class)
+	@ConditionalOnMissingBean(Feign.Builder.class)
 	public Feign.Builder circuitBreakerFeignBuilder() {
 		return PolarisFeignCircuitBreaker.builder();
 	}

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/config/PolarisCircuitBreakerRestTemplateAutoConfiguration.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.config;
 
 import com.tencent.cloud.polaris.circuitbreaker.resttemplate.PolarisCircuitBreakerRestTemplateBeanPostProcessor;
@@ -8,6 +25,11 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
+/**
+ * PolarisCircuitBreakerRestTemplateAutoConfiguration.
+ *
+ * @author sean yu
+ */
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnPolarisCircuitBreakerEnabled
 @ConditionalOnClass(name = "org.springframework.web.client.RestTemplate")
@@ -15,7 +37,7 @@ import org.springframework.context.annotation.Configuration;
 public class PolarisCircuitBreakerRestTemplateAutoConfiguration {
 
 	@Bean
-	public static PolarisCircuitBreakerRestTemplateBeanPostProcessor polarisCircuitBreakerRestTemplateBeanPostProcessor(
+	public PolarisCircuitBreakerRestTemplateBeanPostProcessor polarisCircuitBreakerRestTemplateBeanPostProcessor(
 			ApplicationContext applicationContext) {
 		return new PolarisCircuitBreakerRestTemplateBeanPostProcessor(applicationContext);
 	}

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/feign/PolarisCircuitBreakerFallbackFactory.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.feign;
 
 import java.io.IOException;
@@ -18,6 +35,11 @@ import feign.codec.Decoder;
 
 import org.springframework.cloud.openfeign.FallbackFactory;
 
+/**
+ * PolarisCircuitBreakerFallbackFactory.
+ *
+ * @author sean yu
+ */
 public class PolarisCircuitBreakerFallbackFactory implements FallbackFactory {
 
 	private final Decoder decoder;
@@ -63,9 +85,12 @@ public class PolarisCircuitBreakerFallbackFactory implements FallbackFactory {
 					if (fallbackInfo.getBody() != null) {
 						responseBuilder.body(fallbackInfo.getBody(), StandardCharsets.UTF_8);
 					}
-					// Feign Response need a nonnull Request, which is not important in fallback response, so we create a fake one
-					Request request = Request.create(Request.HttpMethod.GET, "/", new HashMap<>(), Request.Body.empty(), new RequestTemplate());
-					responseBuilder.request(request);
+					// Feign Response need a nonnull Request,
+					// which is not important in fallback response (no real request),
+					// so we create a fake one
+					Request fakeRequest = Request.create(Request.HttpMethod.GET, "/", new HashMap<>(), Request.Body.empty(), new RequestTemplate());
+					responseBuilder.request(fakeRequest);
+
 					try (Response response = responseBuilder.build()) {
 						return decoder.decode(response, method.getGenericReturnType());
 					}

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/feign/PolarisFeignCircuitBreaker.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.feign;
 
 import feign.Feign;
@@ -7,7 +24,12 @@ import org.springframework.cloud.client.circuitbreaker.CircuitBreakerFactory;
 import org.springframework.cloud.openfeign.CircuitBreakerNameResolver;
 import org.springframework.cloud.openfeign.FallbackFactory;
 
-public class PolarisFeignCircuitBreaker {
+/**
+ * PolarisFeignCircuitBreaker, mostly copy from FeignCircuitBreaker, but giving Polaris modification.
+ *
+ * @author sean yu
+ */
+public final class PolarisFeignCircuitBreaker {
 
 	private PolarisFeignCircuitBreaker() {
 		throw new IllegalStateException("Don't instantiate a utility class");

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/feign/PolarisFeignCircuitBreakerInvocationHandler.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.feign;
 
 import java.lang.reflect.InvocationHandler;
@@ -23,6 +40,11 @@ import org.springframework.web.context.request.RequestContextHolder;
 
 import static feign.Util.checkNotNull;
 
+/**
+ * PolarisFeignCircuitBreakerInvocationHandler, mostly copy from FeignCircuitBreakerInvocationHandler, but giving Polaris modification.
+ *
+ * @author sean yu
+ */
 public class PolarisFeignCircuitBreakerInvocationHandler implements InvocationHandler {
 
 	private final CircuitBreakerFactory factory;

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/feign/PolarisFeignCircuitBreakerTargeter.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.feign;
 
 import feign.Feign;
@@ -6,12 +23,16 @@ import feign.Target;
 import org.springframework.cloud.client.circuitbreaker.CircuitBreakerFactory;
 import org.springframework.cloud.openfeign.CircuitBreakerNameResolver;
 import org.springframework.cloud.openfeign.FallbackFactory;
-import org.springframework.cloud.openfeign.FeignCircuitBreaker;
 import org.springframework.cloud.openfeign.FeignClientFactoryBean;
 import org.springframework.cloud.openfeign.FeignContext;
 import org.springframework.cloud.openfeign.Targeter;
 import org.springframework.util.StringUtils;
 
+/**
+ * PolarisFeignCircuitBreakerTargeter, mostly copy from FeignCircuitBreakerTargeter, but giving Polaris modification.
+ *
+ * @author sean yu
+ */
 public class PolarisFeignCircuitBreakerTargeter implements Targeter {
 
 	private final CircuitBreakerFactory circuitBreakerFactory;

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/resttemplate/PolarisCircuitBreakerFallback.java

@@ -1,5 +1,27 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.resttemplate;
 
+/**
+ * PolarisCircuitBreakerFallback.
+ *
+ * @author sean yu
+ */
 public interface PolarisCircuitBreakerFallback {
 
 	PolarisCircuitBreakerHttpResponse fallback();

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/resttemplate/PolarisCircuitBreakerHttpResponse.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.resttemplate;
 
 import java.io.ByteArrayInputStream;
@@ -13,6 +30,11 @@ import org.springframework.http.client.AbstractClientHttpResponse;
 
 import static com.tencent.cloud.rpc.enhancement.resttemplate.EnhancedRestTemplateReporter.POLARIS_CIRCUIT_BREAKER_FALLBACK_HEADER;
 
+/**
+ * PolarisCircuitBreakerHttpResponse.
+ *
+ * @author sean yu
+ */
 public class PolarisCircuitBreakerHttpResponse extends AbstractClientHttpResponse {
 
 	private final CircuitBreakerStatus.FallbackInfo fallbackInfo;
@@ -34,7 +56,7 @@ public class PolarisCircuitBreakerHttpResponse extends AbstractClientHttpRespons
 	}
 
 	@Override
-	public final int getRawStatusCode() throws IOException {
+	public final int getRawStatusCode() {
 		return fallbackInfo.getCode();
 	}
 

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/resttemplate/PolarisCircuitBreakerRestTemplate.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.resttemplate;
 
 import java.lang.annotation.Documented;
@@ -6,13 +23,31 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
+/**
+ * PolarisCircuitBreakerRestTemplate annotation.
+ * if coded fallback or fallbackClass provided, RestTemplate will always return fallback when any exception occurs,
+ * if none coded fallback or fallbackClass provided, RestTemplate will return fallback response from Polaris server when fallback occurs.
+ * fallback and fallbackClass cannot provide at same time.
+ *
+ * @author sean yu
+ */
 @Target({ ElementType.METHOD })
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 public @interface PolarisCircuitBreakerRestTemplate {
 
+	/**
+	 * a fallback string, will return a response { status: 200, body: fallback string} when any exception occurs.
+	 *
+	 * @return fallback string
+	 */
 	String fallback() default "";
 
+	/**
+	 * a fallback Class,  will return a PolarisCircuitBreakerHttpResponse when any exception occurs.
+	 *
+	 * @return PolarisCircuitBreakerFallback
+	 */
 	Class<? extends PolarisCircuitBreakerFallback> fallbackClass() default PolarisCircuitBreakerFallback.class;
 
 }

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/resttemplate/PolarisCircuitBreakerRestTemplateBeanPostProcessor.java

@@ -1,10 +1,24 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.resttemplate;
 
 import java.util.concurrent.ConcurrentHashMap;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.config.BeanDefinition;
 import org.springframework.beans.factory.support.BeanDefinitionBuilder;
@@ -18,9 +32,13 @@ import org.springframework.core.type.StandardMethodMetadata;
 import org.springframework.util.StringUtils;
 import org.springframework.web.client.RestTemplate;
 
+/**
+ * PolarisCircuitBreakerRestTemplateBeanPostProcessor.
+ *
+ * @author sean yu
+ */
 public class PolarisCircuitBreakerRestTemplateBeanPostProcessor implements MergedBeanDefinitionPostProcessor {
 
-	private static final Logger log = LoggerFactory.getLogger(PolarisCircuitBreakerRestTemplateBeanPostProcessor.class);
 	private final ApplicationContext applicationContext;
 
 	public PolarisCircuitBreakerRestTemplateBeanPostProcessor(ApplicationContext applicationContext) {

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/resttemplate/PolarisCircuitBreakerRestTemplateInterceptor.java

@@ -1,3 +1,20 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.resttemplate;
 
 import java.io.IOException;
@@ -18,6 +35,11 @@ import org.springframework.web.client.RestTemplate;
 
 import static com.tencent.cloud.rpc.enhancement.resttemplate.EnhancedRestTemplateReporter.HEADER_HAS_ERROR;
 
+/**
+ * PolarisCircuitBreakerRestTemplateInterceptor.
+ *
+ * @author sean yu
+ */
 public class PolarisCircuitBreakerRestTemplateInterceptor implements ClientHttpRequestInterceptor {
 
 	private final PolarisCircuitBreakerRestTemplate polarisCircuitBreakerRestTemplate;

spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-callee-service2/src/main/java/com/tencent/cloud/polaris/ciruitbreaker/example/ServiceBController.java

@@ -18,8 +18,6 @@
 
 package com.tencent.cloud.polaris.ciruitbreaker.example;
 
-import java.util.concurrent.atomic.AtomicInteger;
-
 import org.springframework.http.HttpStatus;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;

spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-feign-example/src/main/java/com/tencent/cloud/polaris/circuitbreaker/feign/example/ProviderB.java

@@ -18,7 +18,6 @@
 package com.tencent.cloud.polaris.circuitbreaker.feign.example;
 
 import org.springframework.cloud.openfeign.FeignClient;
-import org.springframework.context.annotation.Primary;
 import org.springframework.web.bind.annotation.GetMapping;
 
 /**

spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-feign-example/src/main/java/com/tencent/cloud/polaris/circuitbreaker/feign/example/ProviderBWithFallback.java

@@ -1,8 +1,30 @@
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.feign.example;
 
 import org.springframework.cloud.openfeign.FeignClient;
 import org.springframework.web.bind.annotation.GetMapping;
 
+/**
+ * ProviderBWithFallback.
+ *
+ * @author sean yu
+ */
 @FeignClient(name = "polaris-circuitbreaker-callee-service", contextId = "fallback-from-code", fallback = ProviderBFallback.class)
 public interface ProviderBWithFallback {
 

spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-gateway-example/src/main/resources/bootstrap.yml

@@ -35,7 +35,9 @@ spring:
           'filters[1]':
             name: CircuitBreaker
             args:
+              # statusCodes 缺省时会自动识别 "4**，5**" 为错误
               statusCodes: '''4**,502'''
+              # fallbackUri 缺省时会在熔断触发后拉取 plaris server 配置的降级作为 response
               fallbackUri: '''forward:/polaris-fallback'''
 #      routes:
 #        - id: polaris-circuitbreaker-callee-service

spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-resttemplate-example/src/main/java/com/tencent/cloud/polaris/circuitbreaker/resttemplate/example/CustomPolarisCircuitBreakerFallback.java

@@ -1,5 +1,21 @@
-package com.tencent.cloud.polaris.circuitbreaker.resttemplate.example;
+/*
+ * Tencent is pleased to support the open source community by making Spring Cloud Tencent available.
+ *
+ * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
+ *
+ * Licensed under the BSD 3-Clause License (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://opensource.org/licenses/BSD-3-Clause
+ *
+ * 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.tencent.cloud.polaris.circuitbreaker.resttemplate.example;
 
 import java.util.HashMap;
 
@@ -8,6 +24,11 @@ import com.tencent.cloud.polaris.circuitbreaker.resttemplate.PolarisCircuitBreak
 
 import org.springframework.stereotype.Component;
 
+/**
+ * CustomPolarisCircuitBreakerFallback.
+ *
+ * @author sean yu
+ */
 @Component
 public class CustomPolarisCircuitBreakerFallback implements PolarisCircuitBreakerFallback {
 	@Override

spring-cloud-tencent-examples/polaris-circuitbreaker-example/polaris-circuitbreaker-resttemplate-example/src/main/java/com/tencent/cloud/polaris/circuitbreaker/resttemplate/example/ServiceAResTemplate.java

@@ -18,16 +18,11 @@
 
 package com.tencent.cloud.polaris.circuitbreaker.resttemplate.example;
 
-import com.tencent.cloud.polaris.circuitbreaker.resttemplate.PolarisCircuitBreakerFallback;
 import com.tencent.cloud.polaris.circuitbreaker.resttemplate.PolarisCircuitBreakerRestTemplate;
-import com.tencent.cloud.polaris.circuitbreaker.resttemplate.PolarisCircuitBreakerRestTemplateBeanPostProcessor;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.cloud.client.loadbalancer.LoadBalanced;
-import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;
 import org.springframework.web.util.DefaultUriBuilderFactory;

spring-cloud-tencent-rpc-enhancement/src/main/java/com/tencent/cloud/rpc/enhancement/resttemplate/EnhancedRestTemplateReporter.java

@@ -56,7 +56,13 @@ import static com.tencent.cloud.common.constant.ContextConstant.UTF_8;
  */
 public class EnhancedRestTemplateReporter extends AbstractPolarisReporterAdapter implements ResponseErrorHandler, ApplicationContextAware {
 
-	public static final String POLARIS_CIRCUIT_BREAKER_FALLBACK_HEADER = "PolarisCircuitBreakerFallback";
+	/**
+	 * Polaris-CircuitBreaker-Fallback header flag.
+	 */
+	public static final String POLARIS_CIRCUIT_BREAKER_FALLBACK_HEADER = "X-SCT-Polaris-CircuitBreaker-Fallback";
+	/**
+	 * response has error header flag, since EnhancedRestTemplateReporter#hasError always return true.
+	 */
 	public static final String HEADER_HAS_ERROR = "X-SCT-Has-Error";
 	private static final Logger LOGGER = LoggerFactory.getLogger(EnhancedRestTemplateReporter.class);
 	private final ConsumerAPI consumerAPI;