Spring异常重试框架Spring Retry

Spring Retry支持集成到Spring或者Spring Boot项目中，而它支持AOP的切面注入写法，所以在引入时必须引入aspectjweaver.jar包。

快速集成的代码样例：

@Configuration
@EnableRetry
public class Application {

    @Bean
    public Service service() {
        return new Service();
    }

}

@Service
class Service {
    @Retryable(RemoteAccessException.class)
    public service() {
        // ... do something
    }
}

下面是基于Spring Boot项目的集成步骤：

POM：

        <!-- Spring Retry -->
        <dependency>
            <groupId>org.springframework.retry</groupId>
            <artifactId>spring-retry</artifactId>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency>

Service：

package com.jsoft.springboottest.springboottest1;

import java.time.LocalTime;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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 {
    
    private final static Logger logger = LoggerFactory.getLogger(RemoteService.class);
    
    @Retryable(value = { RemoteAccessException.class }, maxAttempts = 3, backoff = @Backoff(delay = 5000l, multiplier = 1))
    public void call() throws Exception {
        logger.info(LocalTime.now()+" do something...");
        throw new RemoteAccessException("RPC调用异常");
    }

    @Recover
    public void recover(RemoteAccessException e) {
        logger.info(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。

Controller：

package com.jsoft.springboottest.springboottest1.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.jsoft.springboottest.springboottest1.RemoteService;

@RestController
public class TestController {
    
    @Autowired
    private RemoteService remoteService;
    
    @RequestMapping("/show")
    public String show(){
        try {
            remoteService.call();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
        }
        return "Hello World";        
    }
}

App：

package com.jsoft.springboottest.springboottest1;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.retry.annotation.EnableRetry;

/**
 * Hello world!
 *
 */
@SpringBootApplication
@EnableRetry
public class App 
{
    public static void main( String[] args )
    {
        SpringApplication.run(App.class, args);
    }
}