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实现自定义SpringBoot框架日志组件の四: 自适应

实现自定义SpringBoot框架日志组件の四: 自适应

作者: Yellowtail | 来源:发表于2022-09-04 21:43 被阅读0次

    系列

    实现自定义SpringBoot框架日志组件の一:日志系统
    实现自定义SpringBoot框架日志组件の二:配置文件
    实现自定义SpringBoot框架日志组件の三: 自定义pattern

    github代码地址

    前言

    前面的内容一直没有实现自适应,这里实现一下
    先描述一下作用:

    因为我们的代码不知道使用方的包名,所以无法在 dev/local 环境自动设置日志级别为 debug,导致根本无法使用,想要使用还得新增配置文件,比较麻烦,所以我们想自适应,自动拿到包名,自动根据环境设置不同的级别

    包名

    包名的判断依据很好说,就是启动类的注解SpringBootApplication 的参数 scanBasePackages
    怎么拿到呢? spring 提供了很多的扩展点,选哪一个呢?

    1. 因为日志组件基本是第一个加载的,因为后续所有代码都有可能打印日志
    2. 业务代码自己也有可能去使用spring 的扩展点

    基于上面两个因素,我决定选一个非常早的扩展点 org.springframework.context.ApplicationContextInitializer
    这个扩展点是在spring上下文初始化之前执行的

    YellowApplicationContextInitializer

    首先在spring.factories里面新增 org.springframework.context.ApplicationContextInitializer=com.github.hwhaocool.log.YellowApplicationContextInitializer

    因为之前已经新增了日志系统,所以此时文件完整内容如下

    # Logging Systems
    org.springframework.boot.logging.LoggingSystemFactory=\
    com.github.hwhaocool.log.YellowLog4J2LoggingSystem.Factory
    
    org.springframework.context.ApplicationContextInitializer=com.github.hwhaocool.log.YellowApplicationContextInitializer
    

    我们实现的时候思路如下

    扩展点 --> Initializer --> 得到package --> 设置级别
    

    因为后面二者是靠第二个点触发的,代码写在一起不合适,而且后两者目的也不太一样,为了方便后续扩展,那就独立一个接口出来吧

    image.png

    大概是这样的,

    1. YellowApplicationContextInitializer 添加到spring.factories里被spring触发
    2. YellowApplicationContextInitializer 触发 IContextInitializer
    3. BasePackageHolderInitializer 先触发,获取、存储包名
    4. LoggerLevelInitializer 获取包名,设置级别

    所以 代码如下

    package com.github.hwhaocool.log;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.context.ApplicationContextInitializer;
    import org.springframework.context.ConfigurableApplicationContext;
    import org.springframework.core.Ordered;
    
    import java.util.Comparator;
    import java.util.List;
    
    /**
     *
     * @author yellowtail
     * @since 2022/8/27 23:59
     */
    public class YellowApplicationContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext>, Ordered {
    
        final Logger LOGGER = LoggerFactory.getLogger(YellowApplicationContextInitializer.class);
    
        static final List<IContextInitializer> contextInitializerList = List.of(
                new BasePackageHolderInitializer(),
                new LoggerLevelInitializer()
        );
    
        @Override
        public int getOrder() {
            return Ordered.LOWEST_PRECEDENCE - 100;
        }
    
        @Override
        public void initialize(ConfigurableApplicationContext applicationContext) {
    
            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug("start initialize");
            }
    
            // 上下文初始化的时候,先排好序,再依次触发
            contextInitializerList.stream()
                    .sorted(Comparator.comparingInt(IContextInitializer::getOrder))
                    .forEach(iContextInitializer -> {
                        try {
                            iContextInitializer.initialize(applicationContext);
    
                            if (LOGGER.isDebugEnabled()) {
                                LOGGER.debug("initialize success, {}", iContextInitializer.getClass().getSimpleName());
                            }
                        } catch (Exception e) {
                            LOGGER.error("initialize {} occur error, ", iContextInitializer.getClass().getSimpleName(), e);
                        }
                    });
    
    
            if (LOGGER.isDebugEnabled()) {
                LOGGER.debug("load all initializer finish");
            }
        }
    
    
    }
    
    

    接口 IContextInitializer 如下

    package com.github.hwhaocool.log;
    
    import org.springframework.context.ConfigurableApplicationContext;
    
    public interface IContextInitializer {
        void initialize(ConfigurableApplicationContext applicationContext);
    
        int getOrder() ;
    }
    
    

    两个方法

    1. getOrder 执行顺序,有了这个,当需要改变顺序的时候,修改实现类就行,不用老是去改调用方代码
    2. initialize 逻辑

    BasePackageHolderInitializer

    这个是获取包名的
    我想了好久,没有思路,最后采用了一种笨办法,代码扫描 org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider

    package com.github.hwhaocool.log;
    
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.config.BeanDefinition;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.ConfigurableApplicationContext;
    import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
    import org.springframework.core.annotation.AnnotationUtils;
    import org.springframework.core.type.filter.AnnotationTypeFilter;
    
    import java.util.Arrays;
    import java.util.Collections;
    import java.util.List;
    import java.util.Set;
    
    /**
     * @author yellowtail
     * @since 2022/8/30 21:54
     */
    public class BasePackageHolderInitializer implements IContextInitializer {
    
        private static final Logger LOGGER = LoggerFactory.getLogger(BasePackageHolderInitializer.class);
    
        @Override
        public int getOrder() {
            return 0;
        }
    
        @Override
        public void initialize(ConfigurableApplicationContext applicationContext) {
    
            // 新建扫描器,不使用默认的过滤器
            ClassPathScanningCandidateComponentProvider scanner = new ClassPathScanningCandidateComponentProvider(false);
    
            // 新增一个过滤器:找到带有注解 SpringBootApplication 的类
            scanner.addIncludeFilter(new AnnotationTypeFilter(SpringBootApplication.class));
    
            // 扫描范围是 所有
            Set<BeanDefinition> candidateComponents = scanner.findCandidateComponents("");
    
            for (BeanDefinition candidateComponent : candidateComponents) {
                Class<?> clazz;
                try {
                    clazz = applicationContext.getClassLoader().loadClass(candidateComponent.getBeanClassName());
                } catch (ClassNotFoundException e) {
                    throw new RuntimeException(e);
                }
    
                SpringBootApplication annotation = AnnotationUtils.findAnnotation(clazz, SpringBootApplication.class);
                if (null == annotation) {
                    continue;
                }
    
                List<String> list = null;
                String[] strings = annotation.scanBasePackages();
    
                if (null == strings || strings.length == 0) {
                    // 没有写注解,就用类的包名
                    String packageName = clazz.getPackageName();
    
                    list = Collections.singletonList(packageName);
                } else {
                    list = Arrays.asList(strings);
                }
    
                LOGGER.info("basePackage {}", list);
    
                BasePackageHolder.setBasePackages(list);
            }
        }
    
    }
    
    

    因为不知道使用方的代码包名,所以只能全局扫描,所以性能比较低,会增加启动耗时(后续可以考虑使用环境变量等修改扫描范围)

    其中BasePackageHolder 只是一个静态类

    public class BasePackageHolder {
    
        static List<String> basePackages;
    
        public static List<String> getBasePackages() {
            return basePackages;
        }
    
        public static void setBasePackages(List<String> basePackages) {
            BasePackageHolder.basePackages = basePackages;
        }
    }
    

    LoggerLevelInitializer

    逻辑比较简单,拿到包名,设置一下级别就行

    package com.github.hwhaocool.log;
    
    import org.apache.logging.log4j.Level;
    import org.apache.logging.log4j.core.config.Configurator;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.context.ConfigurableApplicationContext;
    
    /**
     * 对业务日志进行自适应初始化
     * @author yellowtail
     * @since 2022/8/30 21:54
     */
    public class LoggerLevelInitializer implements IContextInitializer {
    
        private static final Logger LOGGER = LoggerFactory.getLogger(LoggerLevelInitializer.class);
    
        @Override
        public int getOrder() {
            return 1;
        }
    
        @Override
        public void initialize(ConfigurableApplicationContext applicationContext) {
            YellowLog4J2LoggingSystem.ProfileEnum profileEnum = ProfileHolder.getProfileEnum();
    
            if (YellowLog4J2LoggingSystem.ProfileEnum.LOCAL == profileEnum || YellowLog4J2LoggingSystem.ProfileEnum.DEV == profileEnum) {
    
                for (String basePackage : BasePackageHolder.getBasePackages()) {
                    if (basePackage.startsWith("com.github.hwhaocool")) {
                        // 已经配置过了
                        continue;
                    }
    
                    Configurator.setLevel(basePackage, Level.toLevel("debug"));
    
                    LOGGER.info("set debug level for {}", basePackage);
                }
            }
        }
    
    
    }
    
    

    效果

    image.png

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