spring retry 整理-1
添加必要依赖
<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>
然后在启动类上添加@EnableRetry开启重试功能
然后写一个demoservice
@Service
public class RetryService {
static int i =0;
@Retryable(value= {RetryException.class},maxAttempts = 3,backoff = @Backoff(delay = 5000,multiplier = 1))
public void retry() {
synchronized (this) {
i++;
System.err.println("第"+i+"次 retry");
}
throw new RetryException("测试");
}
@Recover
public void buchang(RetryException e) {
synchronized (this) {
System.err.println("补偿失败,原因:"+ e.getMessage());
i = 0;
}
}
class RetryException extends RuntimeException {
public RetryException() {
super();
}
public RetryException(String message) {
super(message);
}
public RetryException(String message, Throwable cause) {
super(message, cause);
}
public RetryException(Throwable cause) {
super(cause);
}
protected RetryException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
}
}
}
注解和参数介绍:
@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
@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
然后调用retryService.retry()结果: