前面demo都是我们手动在main方法粗创建容器再star(),dubbo提供了一个main方法更友好的容器启动
public static void main(String[] args) throws Exception { //<1>使用dubbo 提供的main方法启动容器 com.alibaba.dubbo.container.Main.main(args); }
接口定义
@SPI("spring")//SPI配置 缺省值是Spring
public interface Container {
/**
* start.
*/
void start();
/**
* stop.
*/
void stop();
}
可以发现是SPI接口
类图
Main
public static void main(String[] args) { try { //如果没有启动参数 if (args == null || args.length == 0) { //获得系统变量 如jvm参数配置的-Ddubbo.container=spiKey 如果没有则使用loader.getDefaultExtensionName()"spring" 即 @SPI("spring") String config = ConfigUtils.getProperty(CONTAINER_KEY, loader.getDefaultExtensionName()); //,分割 args = Constants.COMMA_SPLIT_PATTERN.split(config); } //容器集合 可以多容器启动 // SPI扩展点 private static final ExtensionLoader<Container> loader = ExtensionLoader.getExtensionLoader(Container.class); final List<Container> containers = new ArrayList<Container>(); for (int i = 0; i < args.length; i++) { //spi获取对应容器实现 containers.add(loader.getExtension(args[i])); } logger.info("Use container type(" + Arrays.toString(args) + ") to run dubbo serivce."); /** * 埋点 jvm关闭时 关闭容器 *kill pid会优雅关闭 则有新的请求拒绝 等没有进行中的请求 才关闭 *kill -9并不会优雅关闭 */ if ("true".equals(System.getProperty(SHUTDOWN_HOOK_KEY))) { Runtime.getRuntime().addShutdownHook(new Thread("dubbo-container-shutdown-hook") { @Override public void run() { for (Container container : containers) { try { //遍历容器执行stop container.stop(); logger.info("Dubbo " + container.getClass().getSimpleName() + " stopped!"); } catch (Throwable t) { logger.error(t.getMessage(), t); } try { LOCK.lock(); STOP.signal(); } finally { LOCK.unlock(); } } } }); } //循环启动容器 for (Container container : containers) { container.start(); logger.info("Dubbo " + container.getClass().getSimpleName() + " started!"); } System.out.println(new SimpleDateFormat("[yyyy-MM-dd HH:mm:ss]").format(new Date()) + " Dubbo service server started!"); } catch (RuntimeException e) { e.printStackTrace(); logger.error(e.getMessage(), e); System.exit(1); } try { //加锁 LOCK.lock(); //使用Condition 等待 防止线程退出 STOP.await(); } catch (InterruptedException e) { logger.warn("Dubbo service server stopped, interrupted by other thread!", e); } finally { LOCK.unlock(); } }
SpringContainer
/** * SpringContainer. (SPI, Singleton, ThreadSafe) */ public class SpringContainer implements Container { public static final String SPRING_CONFIG = "dubbo.spring.config"; public static final String DEFAULT_SPRING_CONFIG = "classpath*:META-INF/spring/*.xml"; private static final Logger logger = LoggerFactory.getLogger(SpringContainer.class); static ClassPathXmlApplicationContext context; public static ClassPathXmlApplicationContext getContext() { return context; } @Override public void start() { /** * 获取spring.xml配置 * ConfigUtils spring工具类 * 1.先从系统变量获取 * 2.加载系统变量 dubbo.properties.file 配置的file * 3 2没加载到加载dubbo.properties file * */ String configPath = ConfigUtils.getProperty(SPRING_CONFIG); //如果没有配置spring file则获取 classpath*:META-INF/spring/*.xml if (configPath == null || configPath.length() == 0) { configPath = DEFAULT_SPRING_CONFIG; } //启动springXML 容器 context = new ClassPathXmlApplicationContext(configPath.split("[,\\s]+")); context.start(); } @Override public void stop() { try { if (context != null) { context.stop(); context.close(); context = null; } } catch (Throwable e) { logger.error(e.getMessage(), e); } } }
LogbackContainer
/** * 接入logback * */ 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 (level == null || level.length() == 0) { 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("%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); } }
Log4jContainer
/** * Log4jContainer. (SPI, Singleton, ThreadSafe) */ public class Log4jContainer implements Container { public static final String LOG4J_FILE = "dubbo.log4j.file"; public static final String LOG4J_LEVEL = "dubbo.log4j.level"; public static final String LOG4J_SUBDIRECTORY = "dubbo.log4j.subdirectory"; public static final String DEFAULT_LOG4J_LEVEL = "ERROR"; /** * 接入log4j */ @Override @SuppressWarnings("unchecked") public void start() { String file = ConfigUtils.getProperty(LOG4J_FILE); if (file != null && file.length() > 0) { String level = ConfigUtils.getProperty(LOG4J_LEVEL); if (level == null || level.length() == 0) { level = DEFAULT_LOG4J_LEVEL; } Properties properties = new Properties(); properties.setProperty("log4j.rootLogger", level + ",application"); properties.setProperty("log4j.appender.application", "org.apache.log4j.DailyRollingFileAppender"); properties.setProperty("log4j.appender.application.File", file); properties.setProperty("log4j.appender.application.Append", "true"); properties.setProperty("log4j.appender.application.DatePattern", "'.'yyyy-MM-dd"); properties.setProperty("log4j.appender.application.layout", "org.apache.log4j.PatternLayout"); properties.setProperty("log4j.appender.application.layout.ConversionPattern", "%d [%t] %-5p %C{6} (%F:%L) - %m%n"); PropertyConfigurator.configure(properties); } String subdirectory = ConfigUtils.getProperty(LOG4J_SUBDIRECTORY); if (subdirectory != null && subdirectory.length() > 0) { Enumeration<org.apache.log4j.Logger> ls = LogManager.getCurrentLoggers(); while (ls.hasMoreElements()) { org.apache.log4j.Logger l = ls.nextElement(); if (l != null) { Enumeration<Appender> as = l.getAllAppenders(); while (as.hasMoreElements()) { Appender a = as.nextElement(); if (a instanceof FileAppender) { FileAppender fa = (FileAppender) a; String f = fa.getFile(); if (f != null && f.length() > 0) { int i = f.replace('\\', '/').lastIndexOf('/'); String path; if (i == -1) { path = subdirectory; } else { path = f.substring(0, i); if (!path.endsWith(subdirectory)) { path = path + "/" + subdirectory; } f = f.substring(i + 1); } fa.setFile(path + "/" + f); fa.activateOptions(); } } } } } } } @Override public void stop() { } }