Spring的异常重试框架Spring Retry简单配置操作
作者:狂丰 时间:2023-11-25 18:27:35
相关api见:点击进入
/*
* Copyright 2014 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.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 org.springframework.retry.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Annotation for a method invocation that is retryable.
*
* @author Dave Syer
* @author Artem Bilan
* @author Gary Russell
* @since 1.1
*
*/
@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Retryable {
/**
* Retry interceptor bean name to be applied for retryable method. Is mutually
* exclusive with other attributes.
* @return the retry interceptor bean name
*/
String interceptor() default "";
/**
* Exception types that are retryable. Synonym for includes(). Defaults to empty (and
* if excludes is also empty all exceptions are retried).
* @return exception types to retry
*/
Class<? extends Throwable>[] value() default {};
/**
* Exception types that are retryable. Defaults to empty (and if excludes is also
* empty all exceptions are retried).
* @return exception types to retry
*/
Class<? extends Throwable>[] include() default {};
/**
* Exception types that are not retryable. Defaults to empty (and if includes is also
* empty all exceptions are retried).
* @return exception types to retry
*/
Class<? extends Throwable>[] exclude() default {};
/**
* A unique label for statistics reporting. If not provided the caller may choose to
* ignore it, or provide a default.
*
* @return the label for the statistics
*/
String label() default "";
/**
* Flag to say that the retry is stateful: i.e. exceptions are re-thrown, but the
* retry policy is applied with the same policy to subsequent invocations with the
* same arguments. If false then retryable exceptions are not re-thrown.
* @return true if retry is stateful, default false
*/
boolean stateful() default false;
/**
* @return the maximum number of attempts (including the first failure), defaults to 3
*/
int maxAttempts() default 3;
/**
* @return an expression evaluated to the maximum number of attempts (including the first failure), defaults to 3
* Overrides {@link #maxAttempts()}.
* @since 1.2
*/
String maxAttemptsExpression() default "";
/**
* Specify the backoff properties for retrying this operation. The default is a
* simple {@link Backoff} specification with no properties - see it's documentation
* for defaults.
* @return a backoff specification
*/
Backoff backoff() default @Backoff();
/**
* Specify an expression to be evaluated after the {@code SimpleRetryPolicy.canRetry()}
* returns true - can be used to conditionally suppress the retry. Only invoked after
* an exception is thrown. The root object for the evaluation is the last {@code Throwable}.
* Other beans in the context can be referenced.
* For example:
* <pre class=code>
* {@code "message.contains('you can retry this')"}.
* </pre>
* and
* <pre class=code>
* {@code "@someBean.shouldRetry(#root)"}.
* </pre>
* @return the expression.
* @since 1.2
*/
String exceptionExpression() default "";
}
下面就 Retryable的简单配置做一个讲解:
首先引入maven依赖:
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
<version>RELEASE</version>
</dependency>
然后在方法上配置注解@Retryable
@Override
@SuppressWarnings("Duplicates")
@Retryable(value = {RemoteAccessException.class}, maxAttempts = 3, backoff = @Backoff(delay = 3000l, multiplier = 0))
public boolean customSendText(String openid, String content) throws RemoteAccessException {
String replyString = "{\n" +
"\"touser\":" + openid + ",\n" +
"\"msgtype\":\"text\",\n" +
"\"text\":\n" +
"{\n" +
"\"content\":" + content + "\n" +
"}\n" +
"}";
try {
logger.info("wx:customSend=request:{}", replyString.toString());
HttpsClient httpClient = HttpsClient.getAsyncHttpClient();
String url = Constant.WX_CUSTOM_SEND;
String token = wxAccessokenService.getAccessToken();
url = url.replace("ACCESS_TOKEN", token);
logger.info("wx:customSend=url:{}", url);
String string = httpClient.doPost(url, replyString);
logger.info("wx:customSend=response:{}", string);
if (StringUtils.isEmpty(string)) throw new RemoteAccessException("发送消息异常");
JSONObject jsonTexts = (JSONObject) JSON.parse(string);
if (jsonTexts.get("errcode") != null) {
String errcode = jsonTexts.get("errcode").toString();
if (errcode == null) {
throw new RemoteAccessException("发送消息异常");
}
if (Integer.parseInt(errcode) == 0) {
return true;
} else {
throw new RemoteAccessException("发送消息异常");
}
} else {
throw new RemoteAccessException("发送消息异常");
}
} catch (Exception e) {
logger.error("wz:customSend:{}", ExceptionUtils.getStackTrace(e));
throw new RemoteAccessException("发送消息异常");
}
}
注解内容介绍:
@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
注意:
1、使用了@Retryable的方法不能在本类被调用,不然重试机制不会生效。也就是要标记为@Service,然后在其它类使用@Autowired注入或者@Bean去实例才能生效。
2、使用了@Retryable的方法里面不能使用try...catch包裹,要在发放上抛出异常,不然不会触发。
3、在重试期间这个方法是同步的,如果使用类似Spring Cloud这种框架的熔断机制时,可以结合重试机制来重试后返回结果。
4、Spring Retry不仅能注入方式去实现,还可以通过API的方式实现,类似熔断处理的机制就基于API方式实现会比较宽松。
来源:https://blog.csdn.net/fz13768884254/article/details/83176459
标签:Spring,重试,Retry
![](/images/zang.png)
![](/images/jiucuo.png)
猜你喜欢
Android中Webview打开网页的同时发送HTTP头信息方法
2022-05-19 20:01:28
Spring Boot实现热部署的实例方法
2023-10-24 08:12:50
C# 实现dataGridView选中一行右键出现菜单的示例代码
2022-05-12 05:15:55
![](https://img.aspxhome.com/file/2023/9/94539_0s.png)
java多线程-同步块实例讲解
2022-06-21 02:10:41
基于Java向zip压缩包追加文件
2023-10-11 17:18:52
浅谈@Aspect@Order各个通知的执行顺序
2021-10-24 19:00:38
![](https://img.aspxhome.com/file/2023/3/94313_0s.png)
Eclipse开发环境导入android sdk的sample中的源码
2021-06-08 05:28:38
![](https://img.aspxhome.com/file/2023/5/138635_0s.png)
Windows系统中C#读写ini配置文件的程序代码示例分享
2022-05-15 08:57:33
C#中lock用法详解
2021-06-07 23:24:05
Android中微信小程序支付倒计时功能
2022-04-02 09:18:23
![](https://img.aspxhome.com/file/2023/9/91659_0s.gif)
java泛型常用通配符实例解析
2022-09-16 22:14:50
![](https://img.aspxhome.com/file/2023/2/67472_0s.jpg)
Spring Cloud Zuul集成Swagger实现过程解析
2021-05-26 12:36:09
![](https://img.aspxhome.com/file/2023/4/129114_0s.png)
详解手把手Maven搭建SpringMVC+Spring+MyBatis框架(超级详细版)
2023-06-22 06:17:48
![](https://img.aspxhome.com/file/2023/4/77394_0s.png)
解决Spring使用@MapperScan问题
2021-11-01 23:55:13
![](https://img.aspxhome.com/file/2023/3/73103_0s.jpg)
IDEA远程连接HBase及其Java API实战详解
2023-11-27 21:54:46
![](https://img.aspxhome.com/file/2023/9/60169_0s.png)
基于Hadoop实现Knn算法
2023-11-27 04:01:20
![](https://img.aspxhome.com/file/2023/8/60048_0s.jpg)
c#代码自动修改解决方案下任意文件实例
2023-01-31 07:27:10
Flutter刷新组件RefreshIndicator自定义样式demo
2023-07-06 15:56:45
![](https://img.aspxhome.com/file/2023/2/58272_0s.webp)
Android Studio实现简单的通讯录
2023-06-13 06:49:56
![](https://img.aspxhome.com/file/2023/7/118967_0s.jpg)
java格式化数字操作 NumberFormat及DecimalFormat
2023-02-23 22:03:23
![](https://img.aspxhome.com/file/2023/6/116176_0s.png)