序
本文主要研究一下dubbo的LogbackContainer
LogbackContainer
dubbo-2.7.2/dubbo-container/dubbo-container-logback/src/main/java/org/apache/dubbo/container/logback/LogbackContainer.java
代码语言：javascript复制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<ILoggingEvent> fileAppender = new RollingFileAppender<ILoggingEvent>();
fileAppender.setContext(loggerContext);
fileAppender.setName("application");
fileAppender.setFile(file);
fileAppender.setAppend(true);
// policy
TimeBasedRollingPolicy<ILoggingEvent> policy = new TimeBasedRollingPolicy<ILoggingEvent>();
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("�te [%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
代码语言：javascript复制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
doc
- LogbackContainer
