相关api见：点击进入
?
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/*
* 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：
?
|
1
2
3
4
5
|
<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
?
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
@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
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。
以上这篇Spring的异常重试框架Spring Retry简单配置操作就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持快网idc。
原文链接：https://blog.csdn.net/fz13768884254/article/details/83176459
相关文章
猜你喜欢
- ASP.NET本地开发时常见的配置错误及解决方法？ 2025-06-10
- ASP.NET自助建站系统的数据库备份与恢复操作指南 2025-06-10
- 个人网站服务器域名解析设置指南：从购买到绑定全流程 2025-06-10
- 个人网站搭建：如何挑选具有弹性扩展能力的服务器？ 2025-06-10
- 个人服务器网站搭建：如何选择适合自己的建站程序或框架？ 2025-06-10
