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 :
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。
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