dubbo中LogbackContainer的作用是什么
这篇文章给大家介绍dubbo中LogbackContainer的作用是什么，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
LogbackContainer
dubbo-2.7.2/dubbo-container/dubbo-container-logback/src/main/java/org/apache/dubbo/container/logback/LogbackContainer.java
public class LogbackContainer implements Container { public static final String LOGBACK_FILE = "dubbo.logback.file"; public static final String LOGBACK_LEVEL = "dubbo.logback.level"; public static final String LOGBACK_MAX_HISTORY = "dubbo.logback.maxhistory"; public static final String DEFAULT_LOGBACK_LEVEL = "ERROR"; @Override public void start() { String file = ConfigUtils.getProperty(LOGBACK_FILE); if (file != null && file.length() > 0) { String level = ConfigUtils.getProperty(LOGBACK_LEVEL); if (StringUtils.isEmpty(level)) { level = DEFAULT_LOGBACK_LEVEL; } // maxHistory=0 Infinite history int maxHistory = StringUtils.parseInteger(ConfigUtils.getProperty(LOGBACK_MAX_HISTORY)); doInitializer(file, level, maxHistory); } } @Override public void stop() { } /** * Initializer logback * * @param file * @param level * @param maxHistory */ private void doInitializer(String file, String level, int maxHistory) { LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory(); Logger rootLogger = loggerContext.getLogger(Logger.ROOT_LOGGER_NAME); rootLogger.detachAndStopAllAppenders(); // appender RollingFileAppender fileAppender = new RollingFileAppender(); fileAppender.setContext(loggerContext); fileAppender.setName("application"); fileAppender.setFile(file); fileAppender.setAppend(true); // policy TimeBasedRollingPolicy policy = new TimeBasedRollingPolicy(); policy.setContext(loggerContext); policy.setMaxHistory(maxHistory); policy.setFileNamePattern(file + ".%d{yyyy-MM-dd}"); policy.setParent(fileAppender); policy.start(); fileAppender.setRollingPolicy(policy); // encoder PatternLayoutEncoder encoder = new PatternLayoutEncoder(); encoder.setContext(loggerContext); encoder.setPattern("%date [%thread] %-5level %logger (%file:%line\\) - %msg%n"); encoder.start(); fileAppender.setEncoder(encoder); fileAppender.start(); rootLogger.addAppender(fileAppender); rootLogger.setLevel(Level.toLevel(level)); rootLogger.setAdditive(false); }} LogbackContainer实现了Container接口，其start方法判断是否有指定dubbo.logback.file，如果有则进一步获取dubbo.logback.level，如果为空则默认为ERROR级别，然后再获取dubbo.logback.maxhistory，最后调用doInitializer；doInitializer方法先获取rootLogger，然后执行detachAndStopAllAppenders，然后配置RollingFileAppender，并指定policy为TimeBasedRollingPolicy，并设置PatternLayoutEncoder，然后启动fileAppender，并添加到rootLogger中
实例
dubbo-2.7.2/dubbo-container/dubbo-container-logback/src/test/java/org/apache/dubbo/container/logback/LogbackContainerTest.java
public class LogbackContainerTest { private static final Logger logger = LoggerFactory.getLogger(LogbackContainerTest.class); @Test public void testContainer() { LogbackContainer container = (LogbackContainer) ExtensionLoader.getExtensionLoader(Container.class) .getExtension("logback"); container.start(); logger.debug("Test debug:" + this.getClass().getName()); logger.warn("Test warn:" + this.getClass().getName()); logger.info("Test info:" + this.getClass().getName()); logger.error("Test error:" + this.getClass().getName()); container.stop(); }}这里通过启动logback的container然后再使用logger输出进行验证
小结
LogbackContainer实现了Container接口，其start方法判断是否有指定dubbo.logback.file，如果有则进一步获取dubbo.logback.level，如果为空则默认为ERROR级别，然后再获取dubbo.logback.maxhistory，最后调用doInitializer；doInitializer方法先获取rootLogger，然后执行detachAndStopAllAppenders，然后配置RollingFileAppender，并指定policy为TimeBasedRollingPolicy，并设置PatternLayoutEncoder，然后启动fileAppender，并添加到rootLogger中
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