聊聊ElasticsearchUncaughtExceptionHandler

class ElasticsearchUncaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
    private static final Logger logger = LogManager.getLogger(ElasticsearchUncaughtExceptionHandler.class);
​
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        if (isFatalUncaught(e)) {
            try {
                onFatalUncaught(t.getName(), e);
            } finally {
                // we use specific error codes in case the above notification failed, at least we
                // will have some indication of the error bringing us down
                if (e instanceof InternalError) {
                    halt(128);
                } else if (e instanceof OutOfMemoryError) {
                    halt(127);
                } else if (e instanceof StackOverflowError) {
                    halt(126);
                } else if (e instanceof UnknownError) {
                    halt(125);
                } else if (e instanceof IOError) {
                    halt(124);
                } else {
                    halt(1);
                }
            }
        } else {
            onNonFatalUncaught(t.getName(), e);
        }
    }
​
    static boolean isFatalUncaught(Throwable e) {
        return e instanceof Error;
    }
​
    void onFatalUncaught(final String threadName, final Throwable t) {
        logger.error(() -> new ParameterizedMessage("fatal error in thread [{}], exiting", threadName), t);
    }
​
    void onNonFatalUncaught(final String threadName, final Throwable t) {
        logger.warn(() -> new ParameterizedMessage("uncaught exception in thread [{}]", threadName), t);
    }
​
    void halt(int status) {
        AccessController.doPrivileged(new PrivilegedHaltAction(status));
    }
​
    static class PrivilegedHaltAction implements PrivilegedAction<Void> {
​
        private final int status;
​
        private PrivilegedHaltAction(final int status) {
            this.status = status;
        }
​
        @SuppressForbidden(reason = "halt")
        @Override
        public Void run() {
            // we halt to prevent shutdown hooks from running
            Runtime.getRuntime().halt(status);
            return null;
        }
​
    }
​
}

final class Bootstrap {
​
    private static volatile Bootstrap INSTANCE;
    private volatile Node node;
    private final CountDownLatch keepAliveLatch = new CountDownLatch(1);
    private final Thread keepAliveThread;
    private final Spawner spawner = new Spawner();
​
    //......
​
    static void init(
            final boolean foreground,
            final Path pidFile,
            final boolean quiet,
            final Environment initialEnv) throws BootstrapException, NodeValidationException, UserException {
        // force the class initializer for BootstrapInfo to run before
        // the security manager is installed
        BootstrapInfo.init();
​
        INSTANCE = new Bootstrap();
​
        final SecureSettings keystore = loadSecureSettings(initialEnv);
        final Environment environment = createEnvironment(pidFile, keystore, initialEnv.settings(), initialEnv.configFile());
​
        LogConfigurator.setNodeName(Node.NODE_NAME_SETTING.get(environment.settings()));
        try {
            LogConfigurator.configure(environment);
        } catch (IOException e) {
            throw new BootstrapException(e);
        }
        if (environment.pidFile() != null) {
            try {
                PidFile.create(environment.pidFile(), true);
            } catch (IOException e) {
                throw new BootstrapException(e);
            }
        }
​
        final boolean closeStandardStreams = (foreground == false) || quiet;
        try {
            if (closeStandardStreams) {
                final Logger rootLogger = LogManager.getRootLogger();
                final Appender maybeConsoleAppender = Loggers.findAppender(rootLogger, ConsoleAppender.class);
                if (maybeConsoleAppender != null) {
                    Loggers.removeAppender(rootLogger, maybeConsoleAppender);
                }
                closeSystOut();
            }
​
            // fail if somebody replaced the lucene jars
            checkLucene();
​
            // install the default uncaught exception handler; must be done before security is
            // initialized as we do not want to grant the runtime permission
            // setDefaultUncaughtExceptionHandler
            Thread.setDefaultUncaughtExceptionHandler(new ElasticsearchUncaughtExceptionHandler());
​
            INSTANCE.setup(true, environment);
​
            try {
                // any secure settings must be read during node construction
                IOUtils.close(keystore);
            } catch (IOException e) {
                throw new BootstrapException(e);
            }
​
            INSTANCE.start();
​
            if (closeStandardStreams) {
                closeSysError();
            }
        } catch (NodeValidationException | RuntimeException e) {
            // disable console logging, so user does not see the exception twice (jvm will show it already)
            final Logger rootLogger = LogManager.getRootLogger();
            final Appender maybeConsoleAppender = Loggers.findAppender(rootLogger, ConsoleAppender.class);
            if (foreground && maybeConsoleAppender != null) {
                Loggers.removeAppender(rootLogger, maybeConsoleAppender);
            }
            Logger logger = LogManager.getLogger(Bootstrap.class);
            // HACK, it sucks to do this, but we will run users out of disk space otherwise
            if (e instanceof CreationException) {
                // guice: log the shortened exc to the log file
                ByteArrayOutputStream os = new ByteArrayOutputStream();
                PrintStream ps = null;
                try {
                    ps = new PrintStream(os, false, "UTF-8");
                } catch (UnsupportedEncodingException uee) {
                    assert false;
                    e.addSuppressed(uee);
                }
                new StartupException(e).printStackTrace(ps);
                ps.flush();
                try {
                    logger.error("Guice Exception: {}", os.toString("UTF-8"));
                } catch (UnsupportedEncodingException uee) {
                    assert false;
                    e.addSuppressed(uee);
                }
            } else if (e instanceof NodeValidationException) {
                logger.error("node validation exception\n{}", e.getMessage());
            } else {
                // full exception
                logger.error("Exception", e);
            }
            // re-enable it if appropriate, so they can see any logging during the shutdown process
            if (foreground && maybeConsoleAppender != null) {
                Loggers.addAppender(rootLogger, maybeConsoleAppender);
            }
​
            throw e;
        }
    }
​
    //......
}