Spring重试支持Spring Retry的方法
本文介绍了Spring重试支持Spring Retry的方法,分享给大家,具体如下:
第一步、引入maven依赖
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.3.RELEASE</version> </parent> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/org.springframework.retry/spring-retry --> <dependency> <groupId>org.springframework.retry</groupId> <artifactId>spring-retry</artifactId> <version>1.1.2.RELEASE</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.6</version> </dependency>
第二步、添加@Retryable和@Recover注解
package hello; import org.springframework.remoting.RemoteAccessException; import org.springframework.retry.annotation.Backoff; import org.springframework.retry.annotation.Recover; import org.springframework.retry.annotation.Retryable; import org.springframework.stereotype.Service; @Service public class RemoteService { @Retryable(value= {RemoteAccessException.class},maxAttempts = 3,backoff = @Backoff(delay = 5000l,multiplier = 1)) public void call() throws Exception { System.out.println("do something..."); throw new RemoteAccessException("RPC调用异常"); } @Recover public void recover(RemoteAccessException e) { System.out.println(e.getMessage()); } }
@Retryable注解
被注解的方法发生异常时会重试
value:指定发生的异常进行重试
include:和value一样,默认空,当exclude也为空时,所有异常都重试
exclude:指定异常不重试,默认空,当include也为空时,所有异常都重试
maxAttemps:重试次数,默认3
backoff:重试补偿机制,默认没有
@Backoff注解
delay:指定延迟后重试
multiplier:指定延迟的倍数,比如delay=5000l,multiplier=2时,第一次重试为5秒后,第二次为10秒,第三次为20秒
@Recover
当重试到达指定次数时,被注解的方法将被回调,可以在该方法中进行日志处理。需要注意的是发生的异常和入参类型一致时才会回调
第三步、SpringBoot方式启动容器、测试
添加@EnableRetry注解,启用重试功能
package hello; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.ApplicationContext; import org.springframework.context.annotation.AnnotationConfigApplicationContext; import org.springframework.retry.annotation.EnableRetry; @SpringBootApplication @EnableRetry public class Application { public static void main(String[] args) throws Exception { ApplicationContext annotationContext = new AnnotationConfigApplicationContext("hello"); RemoteService remoteService = annotationContext.getBean("remoteService", RemoteService.class); remoteService.call(); } }
运行结果:
16:50:51.012 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry: count=0
do something…
16:50:51.025 [main] DEBUG org.springframework.retry.backoff.ExponentialBackOffPolicy - Sleeping for 5000
16:50:56.026 [main] DEBUG org.springframework.retry.support.RetryTemplate - Checking for rethrow: count=1
16:50:56.026 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry: count=1
do something…
16:50:56.026 [main] DEBUG org.springframework.retry.backoff.ExponentialBackOffPolicy - Sleeping for 5000
16:51:01.026 [main] DEBUG org.springframework.retry.support.RetryTemplate - Checking for rethrow: count=2
16:51:01.027 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry: count=2
do something…
16:51:01.027 [main] DEBUG org.springframework.retry.support.RetryTemplate - Checking for rethrow: count=3
16:51:01.027 [main] DEBUG org.springframework.retry.support.RetryTemplate - Retry failed last attempt: count=3
RPC调用异常
参考 :https://github.com/spring-projects/spring-retry
补充
对于非幂等的请求(比如新增,更新操作),千万不要使用重试,对数据一致性会造成很大影响。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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