GH-22: Add @EnableRetry.order()

Fixes https://github.com/spring-projects/spring-retry/issues/22

Configure `@Retryable` before `@Transactional`, so we can handle transaction with stateless retries

src/main/java/org/springframework/retry/annotation/EnableRetry.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -24,6 +24,7 @@ import java.lang.annotation.Target;
 
 import org.springframework.context.annotation.EnableAspectJAutoProxy;
 import org.springframework.context.annotation.Import;
+import org.springframework.core.Ordered;
 import org.springframework.core.annotation.AliasFor;
 
 /**
@@ -33,7 +34,8 @@ import org.springframework.core.annotation.AliasFor;
  * the annotations.
  *
  * @author Dave Syer
- * @since 2.0
+ * @author Yanming Zhou
+ * @since 1.1
  *
  */
 @Target(ElementType.TYPE)
@@ -51,4 +53,13 @@ public @interface EnableRetry {
 	@AliasFor(annotation = EnableAspectJAutoProxy.class)
 	boolean proxyTargetClass() default false;
 
+	/**
+	 * Indicate the order in which the {@link RetryConfiguration} should be applied.
+	 * <p>
+	 * The default is {@link Ordered#LOWEST_PRECEDENCE} in order to run after all other
+	 * post-processors, so that it can add an advisor to existing proxies rather than
+	 * double-proxy.
+	 */
+	int order() default Ordered.LOWEST_PRECEDENCE;
+
 }

src/main/java/org/springframework/retry/annotation/RetryConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2023 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.
@@ -41,9 +41,13 @@ import org.springframework.beans.factory.InitializingBean;
 import org.springframework.beans.factory.ListableBeanFactory;
 import org.springframework.beans.factory.SmartInitializingSingleton;
 import org.springframework.beans.factory.config.BeanDefinition;
+import org.springframework.context.annotation.ImportAware;
 import org.springframework.context.annotation.Role;
 import org.springframework.core.OrderComparator;
+import org.springframework.core.annotation.AnnotationAttributes;
 import org.springframework.core.annotation.AnnotationUtils;
+import org.springframework.core.type.AnnotationMetadata;
+import org.springframework.lang.Nullable;
 import org.springframework.retry.RetryListener;
 import org.springframework.retry.backoff.Sleeper;
 import org.springframework.retry.interceptor.MethodArgumentsKeyGenerator;
@@ -63,6 +67,7 @@ import org.springframework.util.ReflectionUtils;
  * @author Artem Bilan
  * @author Markus Heiden
  * @author Gary Russell
+ * @author Yanming Zhou
  * @since 1.1
  *
  */
@@ -70,7 +75,10 @@ import org.springframework.util.ReflectionUtils;
 @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
 @Component
 public class RetryConfiguration extends AbstractPointcutAdvisor
-		implements IntroductionAdvisor, BeanFactoryAware, InitializingBean, SmartInitializingSingleton {
+		implements IntroductionAdvisor, BeanFactoryAware, InitializingBean, SmartInitializingSingleton, ImportAware {
+
+	@Nullable
+	protected AnnotationAttributes enableRetry;
 
 	private AnnotationAwareRetryOperationsInterceptor advice;
 
@@ -88,6 +96,12 @@ public class RetryConfiguration extends AbstractPointcutAdvisor
 
 	private BeanFactory beanFactory;
 
+	@Override
+	public void setImportMetadata(AnnotationMetadata importMetadata) {
+		this.enableRetry = AnnotationAttributes
+				.fromMap(importMetadata.getAnnotationAttributes(EnableRetry.class.getName()));
+	}
+
 	@Override
 	public void afterPropertiesSet() throws Exception {
 		this.retryContextCache = findBean(RetryContextCache.class);
@@ -98,8 +112,9 @@ public class RetryConfiguration extends AbstractPointcutAdvisor
 		retryableAnnotationTypes.add(Retryable.class);
 		this.pointcut = buildPointcut(retryableAnnotationTypes);
 		this.advice = buildAdvice();
-		if (this.advice instanceof BeanFactoryAware) {
-			((BeanFactoryAware) this.advice).setBeanFactory(this.beanFactory);
+		this.advice.setBeanFactory(this.beanFactory);
+		if (this.enableRetry != null) {
+			setOrder(enableRetry.getNumber("order"));
 		}
 	}
 

src/test/java/org/springframework/retry/annotation/EnableRetryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2022 the original author or authors.
+ * Copyright 2006-2023 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.
@@ -57,6 +57,7 @@ import static org.mockito.Mockito.verify;
  * @author Gary Russell
  * @author Aldo Sinanaj
  * @author Henning Pöttker
+ * @author Yanming Zhou
  * @since 1.1
  */
 public class EnableRetryTests {
@@ -105,6 +106,15 @@ public class EnableRetryTests {
 		context.close();
 	}
 
+	@Test
+	public void order() {
+		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(
+				TestOrderConfiguration.class);
+		RetryConfiguration config = context.getBean(RetryConfiguration.class);
+		assertThat(config.getOrder()).isEqualTo(1);
+		context.close();
+	}
+
 	@Test
 	public void marker() {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(TestConfiguration.class);
@@ -348,6 +358,17 @@ public class EnableRetryTests {
 
 	}
 
+	@Configuration
+	@EnableRetry(order = 1)
+	protected static class TestOrderConfiguration {
+
+		@Bean
+		public Service service() {
+			return new Service();
+		}
+
+	}
+
 	@Configuration
 	@EnableRetry
 	protected static class TestConfiguration {