fix PolarisFeignCircuitBreaker.Builder

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

@@ -18,9 +18,11 @@
 package com.tencent.cloud.polaris.circuitbreaker.config;
 
 import com.tencent.cloud.polaris.circuitbreaker.feign.PolarisCircuitBreakerNameResolver;
+import com.tencent.cloud.polaris.circuitbreaker.feign.PolarisFeignCircuitBreaker;
 import com.tencent.cloud.polaris.circuitbreaker.feign.PolarisFeignCircuitBreakerTargeter;
 import feign.Feign;
 
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.cloud.client.circuitbreaker.CircuitBreakerFactory;
@@ -29,6 +31,7 @@ import org.springframework.cloud.openfeign.FeignClientFactoryBean;
 import org.springframework.cloud.openfeign.Targeter;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Scope;
 
 /**
  * PolarisCircuitBreakerFeignClientAutoConfiguration.
@@ -47,8 +50,16 @@ public class PolarisCircuitBreakerFeignClientAutoConfiguration {
 	}
 
 	@Bean
+	@ConditionalOnBean(CircuitBreakerFactory.class)
 	public Targeter polarisFeignCircuitBreakerTargeter(CircuitBreakerFactory circuitBreakerFactory, CircuitBreakerNameResolver circuitBreakerNameResolver) {
 		return new PolarisFeignCircuitBreakerTargeter(circuitBreakerFactory, circuitBreakerNameResolver);
 	}
 
+	@Bean
+	@Scope("prototype")
+	@ConditionalOnBean(CircuitBreakerFactory.class)
+	public Feign.Builder circuitBreakerFeignBuilder() {
+		return PolarisFeignCircuitBreaker.builder();
+	}
+
 }

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

@@ -16,8 +16,8 @@ public class PolarisFeignCircuitBreaker {
 	/**
 	 * @return builder for Feign CircuitBreaker integration
 	 */
-	public static PolarisFeignCircuitBreaker.Builder builder(Feign.Builder delegateBuilder) {
-		return new PolarisFeignCircuitBreaker.Builder(delegateBuilder);
+	public static PolarisFeignCircuitBreaker.Builder builder() {
+		return new PolarisFeignCircuitBreaker.Builder();
 	}
 
 	/**
@@ -25,10 +25,7 @@ public class PolarisFeignCircuitBreaker {
 	 */
 	public static final class Builder extends Feign.Builder {
 
-		private final Feign.Builder delegateBuilder;
-
-		public Builder(Feign.Builder delegateBuilder) {
-			this.delegateBuilder = delegateBuilder;
+		public Builder() {
 		}
 
 		private CircuitBreakerFactory circuitBreakerFactory;
@@ -66,9 +63,9 @@ public class PolarisFeignCircuitBreaker {
 		}
 
 		public Feign build(final FallbackFactory<?> nullableFallbackFactory) {
-			delegateBuilder.invocationHandlerFactory((target, dispatch) -> new PolarisFeignCircuitBreakerInvocationHandler(
+			this.invocationHandlerFactory((target, dispatch) -> new PolarisFeignCircuitBreakerInvocationHandler(
 					circuitBreakerFactory, feignClientName, target, dispatch, nullableFallbackFactory, circuitBreakerNameResolver, this.decoder));
-			return delegateBuilder.build();
+			return this.build();
 		}
 
 	}

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

@@ -26,10 +26,10 @@ public class PolarisFeignCircuitBreakerTargeter implements Targeter {
 	@Override
 	public <T> T target(FeignClientFactoryBean factory, Feign.Builder feign, FeignContext context,
 			Target.HardCodedTarget<T> target) {
-		if (!(feign instanceof FeignCircuitBreaker.Builder)) {
+		if (!(feign instanceof PolarisFeignCircuitBreaker.Builder)) {
 			return feign.target(target);
 		}
-		PolarisFeignCircuitBreaker.Builder builder = PolarisFeignCircuitBreaker.builder(feign);
+		PolarisFeignCircuitBreaker.Builder builder = (PolarisFeignCircuitBreaker.Builder) feign;
 		String name = !StringUtils.hasText(factory.getContextId()) ? factory.getName() : factory.getContextId();
 		Class<?> fallback = factory.getFallback();
 		if (fallback != void.class) {