Examples of java.util.logging.Handler

java.util.logging.Handler
A Handler object takes log messages from a Logger and exports them. It might for example, write them to a console or write them to a file, or send them to a network logging service, or forward them to an OS log, or whatever.
A Handler can be disabled by doing a setLevel(Level.OFF) and can be re-enabled by doing a setLevel with an appropriate level.
Handler classes typically use LogManager properties to set default values for the Handler's Filter, Formatter, and Level. See the specific documentation for each concrete Handler class. @version 1.21, 04/07/06 @since 1.4

        System.loadLibrary("LCJPEG");
        System.loadLibrary("LCTIFF");


        // Abbreviate metadata error messages, which can be scroll blinding.
        Logger logger = Logger.getLogger("com.lightcrafts.image.metadata");
        Handler handler = new TerseLoggingHandler(System.out);
        logger.addHandler(handler);
        logger.setUseParentHandlers(false);


        ProgressDialog dialog = Platform.getPlatform().getProgressDialog();
        ProgressThread thread = new ProgressThread(dialog) {

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    }


    private static void initLogging() {
        // Abbreviate metadata error messages, which can be scroll blinding.
        Logger logger = Logger.getLogger("com.lightcrafts.image.metadata");
        Handler handler = new TerseLoggingHandler(System.out);
        logger.addHandler(handler);
        logger.setUseParentHandlers(false);
    }

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     */
  public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, IOException {
            ESeq argv = process_args(args);
            maybe_print_banner();


      Handler fh = new FileHandler("erjang.log");
      Logger.getLogger("").addHandler(fh);
     // Logger.getLogger("erjang").setLevel(Level.FINE);
      // Logger.getLogger("kilim.Task").setLevel(Level.FINEST);


    load_modules_and_drivers(Arrays.asList(MODULES), Arrays.asList(DRIVERS));

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            }


            // Connect to the legacy API
            VConsole.setImplementation(window);


            Handler errorNotificationHandler = GWT
                    .create(ErrorNotificationHandler.class);
            Logger.getLogger("").addHandler(errorNotificationHandler);
        }


        if (LogConfiguration.loggingIsEnabled()) {

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    }


    @Test
    public void containsId_unknownObject() throws SQLException {


        Handler ensureNoLogging = new Handler() {


            @Override
            public void publish(LogRecord record) {
                Assert.fail("No messages should be logged");

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            context.addStep(new OperationStepHandler() {
                public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
                    final ServiceRegistry serviceRegistry = context.getServiceRegistry(false);
                    final ServiceController<Handler> controller = (ServiceController<Handler>) serviceRegistry.getService(LogServices.handlerName(name));
                    if (controller != null) {
                        final Handler handler = controller.getValue();
                        if (operation.hasDefined(LEVEL)) {
                            handler.setLevel(Level.parse(operation.get(LEVEL).asString()));
                        }
                        if (operation.hasDefined(FORMATTER)) {
                            new PatternFormatterSpec(operation.get(FORMATTER).asString()).apply(handler);
                        }
                        if (operation.hasDefined(ENCODING)) {
                            try {
                                handler.setEncoding(operation.get(ENCODING).asString());
                            } catch (UnsupportedEncodingException e) {
                                throw new OperationFailedException(e, new ModelNode().set("Failed to set handler encoding."));
                            }
                        }
                        updateRuntime(operation, handler);

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                sb.append(record.getMessage());
                sb.append("\n");
                return sb.toString();
            }
        };
        Handler ch = new ConsoleHandler();
        ch.setFormatter(sf);
        Logger globalLog = Logger.getLogger("");
        globalLog.addHandler(ch);
        
        ch.setLevel(consoleLevel);
    }

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    /*=================================
          Main class implementation
     *=================================*/


    public static void main(String[] args) throws Exception {
        Handler fh = new ConsoleHandler();
        fh.setLevel(Level.FINEST);
        fh.setFormatter(new Formatter() {
            @Override
            public String format(LogRecord record) {
                String message = formatMessage(record);
                String throwable = "";
                if (record.getThrown() != null) {

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        properties = new ArrayList<Property>();
    }


    @Override
    public synchronized void start(final StartContext context) throws StartException {
        final Handler handler;
        final ModuleLoader moduleLoader = Module.forClass(CustomHandlerService.class).getModuleLoader();
        final ModuleIdentifier id = ModuleIdentifier.create(moduleName);
        try {
            final Class<?> handlerClass = Class.forName(className, false, moduleLoader.loadModule(id).getClassLoader());
            if (Handler.class.isAssignableFrom(handlerClass)) {
                handler = (Handler) handlerClass.newInstance();
            } else {
                throw MESSAGES.invalidType(className, Handler.class);
            }
        } catch (ClassNotFoundException e) {
            throw MESSAGES.classNotFound(e, className);
        } catch (ModuleLoadException e) {
            throw MESSAGES.cannotLoadModule(e, moduleName);
        } catch (InstantiationException e) {
            throw MESSAGES.cannotInstantiateClass(e, className);
        } catch (IllegalAccessException e) {
            throw MESSAGES.cannotAccessClass(e, className);
        }
        if (filter != null) handler.setFilter(filter);
        formatterSpec.apply(handler);
        if (level != null) handler.setLevel(level);
        try {
            handler.setEncoding(encoding);
        } catch (UnsupportedEncodingException e) {
            throw new StartException(e);
        }
        // Set the properties
        setProperties(handler, properties);

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        value = handler;
    }


    @Override
    public synchronized void stop(final StopContext context) {
        final Handler handler = value;
        handler.close();
        properties.clear();
        value = null;
    }

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