牛叉了-arthas 热更新 mybatis mapper xml
Posted 汪小哥
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测试环境能够热更新class 能否热更新mapper xml? arthas 群有同学提了这样的一个需求，必须满足满足
arthas-idea-plugin 2.8 版本 https://plugins.jetbrains.com/plugin/13581-arthas-idea
1、基本思路
1.1 流程图
1.2 实现效果
echo `redis-cli -h '127.0.0.1' -p 6379 get arthasIdeaPluginRedefineCacheKey_e00b5a9e-d926-43c6-8b3f-5790841557ed` | base64 --decode >arthas-idea-plugin-mybatis-mapper-xml-reload.sh;chmod a+x arthas-idea-plugin-mybatis-mapper-xml-reload.sh;./arthas-idea-plugin-mybatis-mapper-xml-reload.sh;
./arthas-idea-plugin-mybatis-mapper-xml-reload.sh: line 13: /Users/wangji/opt/arthas/mybatis/mapper/UserDoMapper.xml: Permission denied
************************************************************************************************************************
* arthas idea plugin begin;start script path: /Users/wangji/opt/arthas/arthas-idea-plugin-mybatis-mapper-xml-reload.sh *
************************************************************************************************************************
decode base64 text to path /Users/wangji/opt/arthas/mybatis/mapper/UserDoMapper.xml
[INFO] JAVA_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home
* [1]: 98083 org.jetbrains.idea.maven.server.RemoteMavenServer36
[2]: 98051 org.jetbrains.jps.cmdline.Launcher
[3]: 98052 com.intellij.idea.Main
[4]: 98167 org.jetbrains.idea.maven.server.RemoteMavenServer36
[5]: 98567 org.jetbrains.jps.cmdline.Launcher
[6]: 98568 com.boot.mybatis.mybatisdemo.MybatisDemoApplication
[7]: 96571 org.jetbrains.kotlin.daemon.KotlinCompileDaemon
[8]: 98076 org.jetbrains.jps.cmdline.Launcher
[9]: 96412
请手动选择进程或者idea 预先配置jps -l 工程名称自动执行
6
******************************************************************
* first: get spring static spring context class1oader hash value *
******************************************************************
arthas start command :/Users/wangji/opt/arthas/as.sh --height 100 --width 200 --select 98568 -c "sc -d com.boot.mybatis.mybatisdemo.common.ApplicationContextProvider" | tee /Users/wangji/opt/arthas/classLoaderHashValue.out
Arthas script version: 3.5.0
[INFO] JAVA_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home
[INFO] Process 98568 already using port 3658
[INFO] Process 98568 already using port 8563
Arthas home: /Users/wangji/opt/arthas
Calculating attach execution time...
Attaching to 98568 using version /Users/wangji/opt/arthas...
real 0m0.236s
user 0m0.419s
sys 0m0.056s
Attach success.
,---. ,------. ,--------.,--. ,--. ,---. ,---.
/ O \\ | .--. ''--. .--'| '--' | / O \\ ' .-'
| .-. || '--'.' | | | .--. || .-. |`. `-.
| | | || |\\ \\ | | | | | || | | |.-' |
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
wiki https://arthas.aliyun.com/doc
tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html
version 3.5.0
main_class com.boot.mybatis.mybatisdemo.MybatisDemoApplication
pid 98568
time 2021-05-10 22:00:59
[arthas@98568]$ sc -d com.boot.mybatis.mybatisdemo.common.ApplicationContextProvider | plaintext
class-info com.boot.mybatis.mybatisdemo.common.ApplicationContextProvider
code-source /Users/wangji/Documents/project/mybatis-demo/target/classes/
name com.boot.mybatis.mybatisdemo.common.ApplicationContextProvider
isInterface false
isAnnotation false
isEnum false
isAnonymousClass false
isArray false
isLocalClass false
isMemberClass false
isPrimitive false
isSynthetic false
simple-name ApplicationContextProvider
modifier public
annotation org.springframework.stereotype.Component
interfaces org.springframework.context.ApplicationContextAware
super-class +-java.lang.Object
class-loader +-sun.misc.Launcher$AppClassLoader@18b4aac2
+-sun.misc.Launcher$ExtClassLoader@5762806e
classLoaderHash 18b4aac2
Affect(row-cnt:1) cost in 22 ms.
[arthas@98568]$
**************************************************************
* last: invoke spring bean to reload mybatis mapper xml file *
**************************************************************
arthas start command :/Users/wangji/opt/arthas/as.sh --height 100 --width 200 --select 98568 -c "ognl -x 3 '#springContext=@com.boot.mybatis.mybatisdemo.common.ApplicationContextProvider@context,#springContext.getBean("mybatisMapperXmlFileReloadService").reloadAllSqlSessionFactoryMapper("/Users/wangji/opt/arthas/mybatis/mapper/UserDoMapper.xml")' -c 18b4aac2" | tee /Users/wangji/opt/arthas/mybatisMapperXmlReloadResult.out
Arthas script version: 3.5.0
[INFO] JAVA_HOME: /Library/Java/JavaVirtualMachines/jdk1.8.0_181.jdk/Contents/Home
[INFO] Process 98568 already using port 3658
[INFO] Process 98568 already using port 8563
Arthas home: /Users/wangji/opt/arthas
Calculating attach execution time...
Attaching to 98568 using version /Users/wangji/opt/arthas...
real 0m0.212s
user 0m0.383s
sys 0m0.051s
Attach success.
,---. ,------. ,--------.,--. ,--. ,---. ,---.
/ O \\ | .--. ''--. .--'| '--' | / O \\ ' .-'
| .-. || '--'.' | | | .--. || .-. |`. `-.
| | | || |\\ \\ | | | | | || | | |.-' |
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
wiki https://arthas.aliyun.com/doc
tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html
version 3.5.0
main_class com.boot.mybatis.mybatisdemo.MybatisDemoApplication
pid 98568
time 2021-05-10 22:00:59
Mapper("/Users/wangji/opt/arthas/mybatis/mapper/UserDoMapper.xml")' -c 18b4aac2 | plaintextontextProvider@context,#springContext.getBean("mybatisMapperXmlFileReloadService").reloadAllSqlSessionFactory
@Boolean[true]
[arthas@98568]$
********************************************************
* arthas idea plugin mybatis mapper xml reload success *
********************************************************
2、解决的问题
- 基于static spring context 调用bean 方法传递 路径,提供一个 spring bean 去执行热更新
- 需要全局的自动化，解决classloader的传递问题，需要脚本去解决。
基于这样的一个思路,提供一个bean 一个路径即可
com.github.wangji92.mybatis.reload.core.MybatisMapperXmlFileReloadService#reloadAllSqlSessionFactoryMapper
详细代码地址可以参考：https://github.com/WangJi92/mybatis-mapper-reload-spring-boot-start
简单的实现有bug 欢迎提交pr
public boolean reloadAllSqlSessionFactoryMapper(String mapperFilePath) {
if (CollectionUtils.isEmpty(sqlSessionFactoryList)) {
log.warn("not find SqlSessionFactory bean");
return false;
}
Path path = Paths.get(mapperFilePath);
if (!Files.exists(path)) {
log.warn("mybatis reload mapper xml not exist ={}", mapperFilePath);
return false;
}
AtomicBoolean result = new AtomicBoolean(true);
sqlSessionFactoryList.parallelStream().forEach(sqlSessionFactory -> {
Configuration configuration = sqlSessionFactory.getConfiguration();
if (!this.removeMapperCacheAndReloadNewMapperFile(path, configuration)) {
log.warn("reload new mapper file fail path={}", path.toString());
result.set(false);
} else {
log.info("reload new mapper file success path={}", path.toString());
}
});
return result.get();
}
3、配置
3.1 配置static spring context
https://www.yuque.com/wangji-yunque/ikhsmq/ugrc8n#4XuEK 详情查看这里。
3.2 配置 reload mapper service bean name method name
4、测试
demo link: https://github.com/WangJi92/mybatis-log-demo
4.1 old
<select id="selectByExample" parameterType="com.boot.mybatis.mybatisdemo.model.dataobject.UserDoExample" resultMap="BaseResultMap">
select
<if test="distinct">
distinct
</if>
<include refid="Base_Column_List" />
from user
<if test="_parameter != null">
<include refid="Example_Where_Clause" />
</if>
<if test="orderByClause != null">
order by ${orderByClause}
</if>
</select>
4.2 选择修改的xml 文件
4.2.1 构建脚本
4.2.2 修改的xml
<select id="selectByExample" parameterType="com.boot.mybatis.mybatisdemo.model.dataobject.UserDoExample" resultMap="BaseResultMap">
select
name
from user
<if test="_parameter != null">
<include refid="Example_Where_Clause" />
</if>
<if test="orderByClause != null">
order by ${orderByClause}
</if>
</select>
4.2.3 执行后的结果
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