Spring Boot 系统日志代码解析-立哥技术

// 男儿何不把吴钩，收取关山五十州
public static LoggingSystem get(ClassLoader classLoader) {
// 获取系统属性
String loggingSystem = System.getProperty(SYSTEM_PROPERTY);

if (StringUtils.hasLength(loggingSystem)) {
       // 是不是NONE
       if (NONE.equals(loggingSystem)) {
           // 空的日志系统
           return new NoOpLoggingSystem();
       }
       return get(classLoader, loggingSystem);
   }
   // 循环所有日志,
   return SYSTEMS.entrySet().stream().filter((entry) -> ClassUtils.isPresent(entry.getKey(), classLoader))
           .map((entry) ->
           // 实例化具体日志
               get(classLoader, entry.getValue())).findFirst()
           .orElseThrow(() -> new IllegalStateException("No suitable logging system located"));
}
//实例化日志系统
private static LoggingSystem get(ClassLoader classLoader, String loggingSystemClass) {
   try {
       Class<?> systemClass = ClassUtils.forName(loggingSystemClass, classLoader);
       Constructor<?> constructor = systemClass.getDeclaredConstructor(ClassLoader.class);
       constructor.setAccessible(true);
       return (LoggingSystem) constructor.newInstance(classLoader);
   }
   catch (Exception ex) {
       throw new IllegalStateException(ex);
   }
}

@Override
public void beforeInitialize() {
   // 日志上下文
   LoggerContext loggerContext = getLoggerContext();
   // 是否初始化
   if (isAlreadyInitialized(loggerContext)) {
       return;
   }
   // 父类方法
   super.beforeInitialize();
   // 添加过滤器
   loggerContext.getTurboFilterList().add(FILTER);
}

private void onApplicationEnvironmentPreparedEvent(ApplicationEnvironmentPreparedEvent event) {
   if (this.loggingSystem == null) {
       this.loggingSystem = LoggingSystem.get(event.getSpringApplication().getClassLoader());
   }
   initialize(event.getEnvironment(), event.getSpringApplication().getClassLoader());
}

protected void initialize(ConfigurableEnvironment environment, ClassLoader classLoader) {
   new LoggingSystemProperties(environment).apply();
   this.logFile = LogFile.get(environment);
   if (this.logFile != null) {
       this.logFile.applyToSystemProperties();
   }
   this.loggerGroups = new LoggerGroups(DEFAULT_GROUP_LOGGERS);
   // 早期的日志级别
   initializeEarlyLoggingLevel(environment);
   // 初始化日志系统
   initializeSystem(environment, this.loggingSystem, this.logFile);
   // 初始化日志级别
   initializeFinalLoggingLevels(environment, this.loggingSystem);
   registerShutdownHookIfNecessary(environment, this.loggingSystem);
}

private void initializeSystem(ConfigurableEnvironment environment, LoggingSystem system, LogFile logFile) {
   LoggingInitializationContext initializationContext = new LoggingInitializationContext(environment);
   String logConfig = environment.getProperty(CONFIG_PROPERTY);
   if (ignoreLogConfig(logConfig)) {
       // 日志系统初始化
       system.initialize(initializationContext, null, logFile);
   }
   else {
       try {
           ResourceUtils.getURL(logConfig).openStream().close();
           system.initialize(initializationContext, logConfig, logFile);
       }
       catch (Exception ex) {
           // NOTE: We can't use the logger here to report the problem
           System.err.println("Logging system failed to initialize using configuration from '" + logConfig + "'");
           ex.printStackTrace(System.err);
           throw new IllegalStateException(ex);
       }
   }
}

@Override
public void initialize(LoggingInitializationContext initializationContext, String configLocation, LogFile logFile) {
   LoggerContext loggerContext = getLoggerContext();
   if (isAlreadyInitialized(loggerContext)) {
       return;
   }
   // 日志初始化
   super.initialize(initializationContext, configLocation, logFile);
   loggerContext.getTurboFilterList().remove(FILTER);
   markAsInitialized(loggerContext);
   if (StringUtils.hasText(System.getProperty(CONFIGURATION_FILE_PROPERTY))) {
       getLogger(LogbackLoggingSystem.class.getName()).warn("Ignoring '" + CONFIGURATION_FILE_PROPERTY
               + "' system property. Please use 'logging.config' instead.");
   }
}

private void initializeWithConventions(LoggingInitializationContext initializationContext, LogFile logFile) {
   String config = getSelfInitializationConfig();
   if (config != null && logFile == null) {
       // self initialization has occurred, reinitialize in case of property changes
       reinitialize(initializationContext);
       return;
   }
   if (config == null) {
       config = getSpringInitializationConfig();
   }
   if (config != null) {
       loadConfiguration(initializationContext, config, logFile);
       return;
   }
   // 加载默认配置
   loadDefaults(initializationContext, logFile);
}

@Override
protected void loadDefaults(LoggingInitializationContext initializationContext, LogFile logFile) {
   LoggerContext context = getLoggerContext();
   stopAndReset(context);
   boolean debug = Boolean.getBoolean("logback.debug");
   if (debug) {
       StatusListenerConfigHelper.addOnConsoleListenerInstance(context, new OnConsoleStatusListener());
   }
   LogbackConfigurator configurator = debug ? new DebugLogbackConfigurator(context)
           : new LogbackConfigurator(context);
   Environment environment = initializationContext.getEnvironment();
   context.putProperty(LoggingSystemProperties.LOG_LEVEL_PATTERN,
           environment.resolvePlaceholders("${logging.pattern.level:${LOG_LEVEL_PATTERN:%5p}}"));
   context.putProperty(LoggingSystemProperties.LOG_DATEFORMAT_PATTERN, environment.resolvePlaceholders(
           "${logging.pattern.dateformat:${LOG_DATEFORMAT_PATTERN:yyyy-MM-dd HH:mm:ss.SSS}}"));
   context.putProperty(LoggingSystemProperties.ROLLING_FILE_NAME_PATTERN, environment
           .resolvePlaceholders("${logging.pattern.rolling-file-name:${LOG_FILE}.%d{yyyy-MM-dd}.%i.gz}"));
   new DefaultLogbackConfiguration(initializationContext, logFile).apply(configurator);
   context.setPackagingDataEnabled(true);
}

@Override
public void initialize(LoggingInitializationContext initializationContext, String configLocation, LogFile logFile) {
   LoggerContext loggerContext = getLoggerContext();
   // 是否加载过
   if (isAlreadyInitialized(loggerContext)) {
       return;
   }
   // 日志初始化
   super.initialize(initializationContext, configLocation, logFile);
   // 删除 FILTER
   loggerContext.getTurboFilterList().remove(FILTER);
   // 初始化标记
   markAsInitialized(loggerContext);
   if (StringUtils.hasText(System.getProperty(CONFIGURATION_FILE_PROPERTY))) {
       getLogger(LogbackLoggingSystem.class.getName()).warn("Ignoring '" + CONFIGURATION_FILE_PROPERTY
               + "' system property. Please use 'logging.config' instead.");
   }
}

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