org.apache.logging.log4j.util.PropertiesUtil Java Examples

private AppenderComponentBuilder createAppender(final String key, final Properties properties) {
    final String name = (String) properties.remove(CONFIG_NAME);
    if (Strings.isEmpty(name)) {
        throw new ConfigurationException("No name attribute provided for Appender " + key);
    }
    final String type = (String) properties.remove(CONFIG_TYPE);
    if (Strings.isEmpty(type)) {
        throw new ConfigurationException("No type attribute provided for Appender " + key);
    }
    final AppenderComponentBuilder appenderBuilder = builder.newAppender(name, type);
    addFiltersToComponent(appenderBuilder, properties);
    final Properties layoutProps = PropertiesUtil.extractSubset(properties, "layout");
    if (layoutProps.size() > 0) {
        appenderBuilder.add(createLayout(name, layoutProps));
    }

    return processRemainingProperties(appenderBuilder, properties);
}
 

private ConfigurationSource getConfigurationSource(URL url) throws IOException, URISyntaxException {
    URLConnection urlConnection = url.openConnection();
    AuthorizationProvider provider = ConfigurationFactory.authorizationProvider(PropertiesUtil.getProperties());
    provider.addAuthorization(urlConnection);
    if (url.getProtocol().equals(HTTPS)) {
        SslConfiguration sslConfiguration = SslConfigurationFactory.getSslConfiguration();
        if (sslConfiguration != null) {
            ((HttpsURLConnection) urlConnection).setSSLSocketFactory(sslConfiguration.getSslSocketFactory());
            if (!sslConfiguration.isVerifyHostName()) {
                ((HttpsURLConnection) urlConnection).setHostnameVerifier(LaxHostnameVerifier.INSTANCE);
            }
        }
    }
    File file = FileUtils.fileFromUri(url.toURI());
    try {
        if (file != null) {
            return new ConfigurationSource(urlConnection.getInputStream(), FileUtils.fileFromUri(url.toURI()));
        } else {
            return new ConfigurationSource(urlConnection.getInputStream(), url, urlConnection.getLastModified());
        }
    } catch (FileNotFoundException ex) {
        LOGGER.info("Unable to locate file {}, ignoring.", url.toString());
        return null;
    }
}
 

static int calculateRingBufferSize(final String propertyName) {
    int ringBufferSize = Constants.ENABLE_THREADLOCALS ? RINGBUFFER_NO_GC_DEFAULT_SIZE : RINGBUFFER_DEFAULT_SIZE;
    final String userPreferredRBSize = PropertiesUtil.getProperties().getStringProperty(propertyName,
            String.valueOf(ringBufferSize));
    try {
        int size = Integer.parseInt(userPreferredRBSize);
        if (size < RINGBUFFER_MIN_SIZE) {
            size = RINGBUFFER_MIN_SIZE;
            LOGGER.warn("Invalid RingBufferSize {}, using minimum size {}.", userPreferredRBSize,
                    RINGBUFFER_MIN_SIZE);
        }
        ringBufferSize = size;
    } catch (final Exception ex) {
        LOGGER.warn("Invalid RingBufferSize {}, using default size {}.", userPreferredRBSize, ringBufferSize);
    }
    return Integers.ceilingNextPowerOfTwo(ringBufferSize);
}
 

static WaitStrategy createWaitStrategy(final String propertyName, final long timeoutMillis) {
    final String strategy = PropertiesUtil.getProperties().getStringProperty(propertyName, "TIMEOUT");
    LOGGER.trace("property {}={}", propertyName, strategy);
    final String strategyUp = strategy.toUpperCase(Locale.ROOT); // TODO Refactor into Strings.toRootUpperCase(String)
    switch (strategyUp) { // TODO Define a DisruptorWaitStrategy enum?
    case "SLEEP":
        return new SleepingWaitStrategy();
    case "YIELD":
        return new YieldingWaitStrategy();
    case "BLOCK":
        return new BlockingWaitStrategy();
    case "BUSYSPIN":
        return new BusySpinWaitStrategy();
    case "TIMEOUT":
        return new TimeoutBlockingWaitStrategy(timeoutMillis, TimeUnit.MILLISECONDS);
    default:
        return new TimeoutBlockingWaitStrategy(timeoutMillis, TimeUnit.MILLISECONDS);
    }
}
 

@Override
public void start() {
    LOGGER.debug("Starting LoggerContext[name={}, {}]...", getName(), this);
    if (PropertiesUtil.getProperties().getBooleanProperty("log4j.LoggerContext.stacktrace.on.start", false)) {
        LOGGER.debug("Stack trace to locate invoker",
                new Exception("Not a real error, showing stack trace to locate invoker"));
    }
    if (configLock.tryLock()) {
        try {
            if (this.isInitialized() || this.isStopped()) {
                this.setStarting();
                reconfigure();
                if (this.configuration.isShutdownHookEnabled()) {
                    setUpShutdownHook();
                }
                this.setStarted();
            }
        } finally {
            configLock.unlock();
        }
    }
    LOGGER.debug("LoggerContext[name={}, {}] started OK.", getName(), this);
}
 

public BasicAuthorizationProvider(PropertiesUtil props) {
    String userName = props.getStringProperty(PREFIXES,AUTH_USER_NAME,
            () -> props.getStringProperty(CONFIG_USER_NAME));
    String password = props.getStringProperty(PREFIXES, AUTH_PASSWORD,
            () -> props.getStringProperty(CONFIG_PASSWORD));
    String decryptor = props.getStringProperty(PREFIXES, AUTH_PASSWORD_DECRYPTOR,
            () -> props.getStringProperty(PASSWORD_DECRYPTOR));
    if (decryptor != null) {
        try {
            Object obj = LoaderUtil.newInstanceOf(decryptor);
            if (obj instanceof PasswordDecryptor) {
                password = ((PasswordDecryptor) obj).decryptPassword(password);
            }
        } catch (Exception ex) {
            LOGGER.warn("Unable to decrypt password.", ex);
        }
    }
    if (userName != null && password != null) {
        authString = "Basic " + encoder.encodeToString((userName + ":" + password).getBytes());
    }
}
 

public static AuthorizationProvider authorizationProvider(PropertiesUtil props) {
    final String authClass = props.getStringProperty(AUTHORIZATION_PROVIDER);
    AuthorizationProvider provider = null;
    if (authClass != null) {
        try {
            Object obj = LoaderUtil.newInstanceOf(authClass);
            if (obj instanceof AuthorizationProvider) {
                provider = (AuthorizationProvider) obj;
            } else {
                LOGGER.warn("{} is not an AuthorizationProvider, using default", obj.getClass().getName());
            }
        } catch (Exception ex) {
            LOGGER.warn("Unable to create {}, using default: {}", authClass, ex.getMessage());
        }
    }
    if (provider == null) {
        provider = new BasicAuthorizationProvider(props);
    }
    return provider;
}
 

/**
 * Returns a new {@code ReliabilityStrategy} instance based on the value of system property
 * {@code log4j.ReliabilityStrategy}. If not value was specified this method returns a new
 * {@code AwaitUnconditionallyReliabilityStrategy}.
 * <p>
 * Valid values for this system property are {@code "AwaitUnconditionally"} (use
 * {@code AwaitUnconditionallyReliabilityStrategy}), {@code "Locking"} (use {@code LockingReliabilityStrategy}) and
 * {@code "AwaitCompletion"} (use the default {@code AwaitCompletionReliabilityStrategy}).
 * <p>
 * Users may also use this system property to specify the fully qualified class name of a class that implements the
 * {@code ReliabilityStrategy} and has a constructor that accepts a single {@code LoggerConfig} argument.
 * 
 * @param loggerConfig the LoggerConfig the resulting {@code ReliabilityStrategy} is associated with
 * @return a ReliabilityStrategy that helps the specified LoggerConfig to log events reliably during or after a
 *         configuration change
 */
public static ReliabilityStrategy getReliabilityStrategy(final LoggerConfig loggerConfig) {

    final String strategy = PropertiesUtil.getProperties().getStringProperty("log4j.ReliabilityStrategy",
            "AwaitCompletion");
    if ("AwaitCompletion".equals(strategy)) {
        return new AwaitCompletionReliabilityStrategy(loggerConfig);
    }
    if ("AwaitUnconditionally".equals(strategy)) {
        return new AwaitUnconditionallyReliabilityStrategy(loggerConfig);
    }
    if ("Locking".equals(strategy)) {
        return new LockingReliabilityStrategy(loggerConfig);
    }
    try {
        final Class<? extends ReliabilityStrategy> cls = Loader.loadClass(strategy).asSubclass(
            ReliabilityStrategy.class);
        return cls.getConstructor(LoggerConfig.class).newInstance(loggerConfig);
    } catch (final Exception dynamicFailed) {
        StatusLogger.getLogger().warn(
                "Could not create ReliabilityStrategy for '{}', using default AwaitCompletionReliabilityStrategy: {}", strategy, dynamicFailed);
        return new AwaitCompletionReliabilityStrategy(loggerConfig);
    }
}
 

private static <B extends ComponentBuilder<?>> B processRemainingProperties(final B builder,
                                                                            final Properties properties) {
    while (properties.size() > 0) {
        final String propertyName = properties.stringPropertyNames().iterator().next();
        final int index = propertyName.indexOf('.');
        if (index > 0) {
            final String prefix = propertyName.substring(0, index);
            final Properties componentProperties = PropertiesUtil.extractSubset(properties, prefix);
            builder.addComponent(createComponent(builder, prefix, componentProperties));
        } else {
            builder.addAttribute(propertyName, properties.getProperty(propertyName));
            properties.remove(propertyName);
        }
    }
    return builder;
}
 

protected void setToDefault() {
    // LOG4J2-1176 facilitate memory leak investigation
    setName(DefaultConfiguration.DEFAULT_NAME + "@" + Integer.toHexString(hashCode()));
    final Layout<? extends Serializable> layout = PatternLayout.newBuilder()
            .setPattern(DefaultConfiguration.DEFAULT_PATTERN)
            .setConfiguration(this)
            .build();
    final Appender appender = ConsoleAppender.createDefaultAppenderForLayout(layout);
    appender.start();
    addAppender(appender);
    final LoggerConfig rootLoggerConfig = getRootLogger();
    rootLoggerConfig.addAppender(appender, null, null);

    final Level defaultLevel = Level.ERROR;
    final String levelName = PropertiesUtil.getProperties().getStringProperty(DefaultConfiguration.DEFAULT_LEVEL,
            defaultLevel.name());
    final Level level = Level.valueOf(levelName);
    rootLoggerConfig.setLevel(level != null ? level : defaultLevel);
}
 

@Override
public void start(final BundleContext context) throws Exception {
    pluginRegistration = context.registerService(PluginService.class.getName(), new Log4jPlugins(),
            new Hashtable<>());
    final Provider provider = new Log4jProvider();
    final Hashtable<String, String> props = new Hashtable<>();
    props.put("APIVersion", "2.60");
    final ContextDataProvider threadContextProvider = new ThreadContextDataProvider();
    provideRegistration = context.registerService(Provider.class.getName(), provider, props);
    contextDataRegistration = context.registerService(ContextDataProvider.class.getName(), threadContextProvider,
            null);
    loadContextProviders(context);
    // allow the user to override the default ContextSelector (e.g., by using BasicContextSelector for a global cfg)
    if (PropertiesUtil.getProperties().getStringProperty(Constants.LOG4J_CONTEXT_SELECTOR) == null) {
        System.setProperty(Constants.LOG4J_CONTEXT_SELECTOR, BundleContextSelector.class.getName());
    }
    contextRef.compareAndSet(null, context);
}
 

private static Clock createClock() {
    final String userRequest = PropertiesUtil.getProperties().getStringProperty(PROPERTY_NAME);
    if (userRequest == null) {
        LOGGER.trace("Using default SystemClock for timestamps.");
        return logSupportedPrecision(new SystemClock());
    }
    Supplier<Clock> specified = aliases().get(userRequest);
    if (specified != null) {
        LOGGER.trace("Using specified {} for timestamps.", userRequest);
        return logSupportedPrecision(specified.get());
    }
    try {
        final Clock result = Loader.newCheckedInstanceOf(userRequest, Clock.class);
        LOGGER.trace("Using {} for timestamps.", result.getClass().getName());
        return logSupportedPrecision(result);
    } catch (final Exception e) {
        final String fmt = "Could not create {}: {}, using default SystemClock for timestamps.";
        LOGGER.error(fmt, userRequest, e);
        return logSupportedPrecision(new SystemClock());
    }
}
 

public void tearDown() throws SQLException {
    final LoggerContext context = LoggerContext.getContext(false);
    try {
        String appenderName = "databaseAppender";
        final Appender appender = context.getConfiguration().getAppender(appenderName);
        assertNotNull("The appender '" + appenderName + "' should not be null.", appender);
        assertTrue("The appender should be a JpaAppender.", appender instanceof JpaAppender);
        ((JpaAppender) appender).getManager().close();
    } finally {
        System.clearProperty(ConfigurationFactory.CONFIGURATION_FILE_PROPERTY);
        PropertiesUtil.getProperties().reload();
        context.reconfigure();
        StatusLogger.getLogger().reset();

        try (Statement statement = this.connection.createStatement();) {
            statement.execute("SHUTDOWN");
        }

        this.connection.close();
    }
}
 

/**
 * Constructor to create the default configuration.
 */
public CustomConfiguration(final LoggerContext loggerContext, final ConfigurationSource source) {
    super(loggerContext, source);

    setName(CONFIG_NAME);
    final Layout<? extends Serializable> layout = PatternLayout.newBuilder()
            .setPattern(DEFAULT_PATTERN)
            .setConfiguration(this)
            .build();
    final Appender appender = ConsoleAppender.createDefaultAppenderForLayout(layout);
    appender.start();
    addAppender(appender);
    final LoggerConfig root = getRootLogger();
    root.addAppender(appender, null, null);

    final String levelName = PropertiesUtil.getProperties().getStringProperty(DEFAULT_LEVEL);
    final Level level = levelName != null && Level.valueOf(levelName) != null ?
            Level.valueOf(levelName) : Level.ERROR;
    root.setLevel(level);
}
 

/**
 * <em>Consider private, used for testing.</em>
 */
static void init() {
    ThreadContextMapFactory.init();
    contextMap = null;
    final PropertiesUtil managerProps = PropertiesUtil.getProperties();
    boolean disableAll = managerProps.getBooleanProperty(DISABLE_ALL);
    useStack = !(managerProps.getBooleanProperty(DISABLE_STACK) || disableAll);
    boolean useMap = !(managerProps.getBooleanProperty(DISABLE_MAP) || disableAll);

    contextStack = new DefaultThreadContextStack(useStack);
    if (!useMap) {
        contextMap = new NoOpThreadContextMap();
    } else {
        contextMap = ThreadContextMapFactory.createThreadContextMap();
    }
    if (contextMap instanceof ReadOnlyThreadContextMap) {
        readOnlyContextMap = (ReadOnlyThreadContextMap) contextMap;
    } else {
        readOnlyContextMap = null;
    }
}
 

@Override
public SmtpManager createManager(final String name, final FactoryData data) {
    final String prefix = "mail." + data.protocol;

    final Properties properties = PropertiesUtil.getSystemProperties();
    properties.setProperty("mail.transport.protocol", data.protocol);
    if (properties.getProperty("mail.host") == null) {
        // Prevent an UnknownHostException in Java 7
        properties.setProperty("mail.host", NetUtils.getLocalHostname());
    }

    if (null != data.host) {
        properties.setProperty(prefix + ".host", data.host);
    }
    if (data.port > 0) {
        properties.setProperty(prefix + ".port", String.valueOf(data.port));
    }

    final Authenticator authenticator = buildAuthenticator(data.username, data.password);
    if (null != authenticator) {
        properties.setProperty(prefix + ".auth", "true");
    }

    if (data.protocol.equals("smtps")) {
        final SslConfiguration sslConfiguration = data.sslConfiguration;
        if (sslConfiguration != null) {
            final SSLSocketFactory sslSocketFactory = sslConfiguration.getSslSocketFactory();
            properties.put(prefix + ".ssl.socketFactory", sslSocketFactory);
            properties.setProperty(prefix + ".ssl.checkserveridentity", Boolean.toString(sslConfiguration.isVerifyHostName()));
        }
    }

    final Session session = Session.getInstance(properties, authenticator);
    session.setProtocolForAddress("rfc822", data.protocol);
    session.setDebug(data.isDebug);
    return new SmtpManager(name, session, null, data);
}
 

/**
 * Get or create a logger with the given name.
 *
 * @param name The name of the logger.
 * @return The logger with the given name.
 */
public static Logger getLogger(String name) {
    AtomicBoolean logWarning = new AtomicBoolean(false);
    initialized.updateAndGet(initialized -> {
        if (!initialized && !ProviderUtil.hasProviders()) {
            noLogger.set(true);
            logWarning.set(true);
        }
        return true;
    });

    if (noLogger.get()) {
        return loggers.computeIfAbsent(name, key -> {
            Level level = FallbackLoggerConfiguration.isTraceEnabled()
                    ? Level.TRACE
                    : (FallbackLoggerConfiguration.isDebugEnabled() ? Level.DEBUG : Level.INFO);
            Logger logger = new SimpleLogger(name, level, true, false, true, true, "yyyy-MM-dd HH:mm:ss.SSSZ", null,
                                             new PropertiesUtil(new Properties()), System.out);
            if (logWarning.get()) {
                logger.info("No Log4j2 compatible logger was found. Using default Javacord implementation!");
            }
            return new PrivacyProtectionLogger(logger);
        });
    } else {
        return new PrivacyProtectionLogger(LogManager.getLogger(name));
    }
}
 

@Override
protected String[] getStandardConfigLocations() {
    String[] locations = super.getStandardConfigLocations();
    PropertiesUtil props = new PropertiesUtil(new Properties());
    String location = props.getStringProperty(ConfigurationFactory.CONFIGURATION_FILE_PROPERTY);
    if (location != null) {
        List<String> list = Arrays.asList(super.getStandardConfigLocations());
        list.add(location);
        locations = list.toArray(new String[0]);
    }
    return locations;
}
 

@Before
@After
public void resetProperties() throws Exception {
    System.clearProperty(AsyncQueueFullPolicyFactory.PROPERTY_NAME_ASYNC_EVENT_ROUTER);
    System.clearProperty(AsyncQueueFullPolicyFactory.PROPERTY_NAME_DISCARDING_THRESHOLD_LEVEL);
    PropertiesUtil.getProperties().reload();
}
 

void init() {
    System.clearProperty("log4j2.threadContextMap");
    final String PACKAGE = "org.apache.logging.log4j.spi.";
    System.setProperty("log4j2.threadContextMap", PACKAGE + implClassSimpleName());
    PropertiesUtil.getProperties().reload();
    ThreadContextTestAccess.init();
}
 

private void prepareThreadContext(boolean isThreadContextMapInheritable) {
    System.setProperty("log4j2.isThreadContextMapInheritable", Boolean.toString(isThreadContextMapInheritable));
    PropertiesUtil.getProperties().reload();
    ThreadContextTest.reinitThreadContext();
    ThreadContext.remove("baz");
    ThreadContext.put("foo", "bar");
}
 

private static AsyncQueueFullPolicy createDiscardingAsyncQueueFullPolicy() {
    final PropertiesUtil util = PropertiesUtil.getProperties();
    final String level = util.getStringProperty(PROPERTY_NAME_DISCARDING_THRESHOLD_LEVEL, Level.INFO.name());
    final Level thresholdLevel = Level.toLevel(level, Level.INFO);
    LOGGER.debug("Creating custom DiscardingAsyncQueueFullPolicy(discardThreshold:{})", thresholdLevel);
    return new DiscardingAsyncQueueFullPolicy(thresholdLevel);
}
 

static ExceptionHandler<AsyncLoggerConfigDisruptor.Log4jEventWrapper> getAsyncLoggerConfigExceptionHandler() {
    final String cls = PropertiesUtil.getProperties().getStringProperty("AsyncLoggerConfig.ExceptionHandler");
    if (cls == null) {
        return new AsyncLoggerConfigDefaultExceptionHandler();
    }
    try {
        @SuppressWarnings("unchecked")
        final Class<? extends ExceptionHandler<AsyncLoggerConfigDisruptor.Log4jEventWrapper>> klass =
                (Class<? extends ExceptionHandler<AsyncLoggerConfigDisruptor.Log4jEventWrapper>>) Loader.loadClass(cls);
        return klass.newInstance();
    } catch (final Exception ignored) {
        LOGGER.debug("Invalid AsyncLoggerConfig.ExceptionHandler value: error creating {}: ", cls, ignored);
        return new AsyncLoggerConfigDefaultExceptionHandler();
    }
}
 

static ExceptionHandler<RingBufferLogEvent> getAsyncLoggerExceptionHandler() {
    final String cls = PropertiesUtil.getProperties().getStringProperty("AsyncLogger.ExceptionHandler");
    if (cls == null) {
        return new AsyncLoggerDefaultExceptionHandler();
    }
    try {
        @SuppressWarnings("unchecked")
        final Class<? extends ExceptionHandler<RingBufferLogEvent>> klass =
            (Class<? extends ExceptionHandler<RingBufferLogEvent>>) Loader.loadClass(cls);
        return klass.newInstance();
    } catch (final Exception ignored) {
        LOGGER.debug("Invalid AsyncLogger.ExceptionHandler value: error creating {}: ", cls, ignored);
        return new AsyncLoggerDefaultExceptionHandler();
    }
}
 

/**
 * Get or create a logger with the given name.
 *
 * @param name The name of the logger.
 * @return The logger with the given name.
 */
public static Logger getLogger(String name) {
    AtomicBoolean logWarning = new AtomicBoolean(false);
    initialized.updateAndGet(initialized -> {
        if (!initialized && !ProviderUtil.hasProviders()) {
            noLogger.set(true);
            logWarning.set(true);
        }
        return true;
    });

    if (noLogger.get()) {
        return loggers.computeIfAbsent(name, key -> {
            Level level = FallbackLoggerConfiguration.isTraceEnabled()
                    ? Level.TRACE
                    : (FallbackLoggerConfiguration.isDebugEnabled() ? Level.DEBUG : Level.INFO);
            Logger logger = new SimpleLogger(name, level, true, false, true, true, "yyyy-MM-dd HH:mm:ss.SSSZ", null,
                                             new PropertiesUtil(new Properties()), System.out);
            if (logWarning.get()) {
                logger.info("No Log4j2 compatible logger was found. Using default Javacord implementation!");
            }
            return new PrivacyProtectionLogger(logger);
        });
    } else {
        return new PrivacyProtectionLogger(LogManager.getLogger(name));
    }
}
 

/**
 * Construct the CompositeConfiguration.
 *
 * @param configurations The List of Configurations to merge.
 */
public CompositeConfiguration(final List<? extends AbstractConfiguration> configurations) {
    super(configurations.get(0).getLoggerContext(), ConfigurationSource.COMPOSITE_SOURCE);
    rootNode = configurations.get(0).getRootNode();
    this.configurations = configurations;
    final String mergeStrategyClassName = PropertiesUtil.getProperties().getStringProperty(MERGE_STRATEGY_PROPERTY,
            DefaultMergeStrategy.class.getName());
    try {
        mergeStrategy = Loader.newInstanceOf(mergeStrategyClassName);
    } catch (ClassNotFoundException | IllegalAccessException | InvocationTargetException |
            InstantiationException ex) {
        mergeStrategy = new DefaultMergeStrategy();
    }
    for (final AbstractConfiguration config : configurations) {
        mergeStrategy.mergeRootProperties(rootNode, config);
    }
    final StatusConfiguration statusConfig = new StatusConfiguration().setVerboseClasses(VERBOSE_CLASSES)
            .setStatus(getDefaultStatus());
    for (final Map.Entry<String, String> entry : rootNode.getAttributes().entrySet()) {
        final String key = entry.getKey();
        final String value = getStrSubstitutor().replace(entry.getValue());
        if ("status".equalsIgnoreCase(key)) {
            statusConfig.setStatus(value.toUpperCase());
        } else if ("dest".equalsIgnoreCase(key)) {
            statusConfig.setDestination(value);
        } else if ("shutdownHook".equalsIgnoreCase(key)) {
            isShutdownHookEnabled = !"disable".equalsIgnoreCase(value);
        } else if ("shutdownTimeout".equalsIgnoreCase(key)) {
            shutdownTimeoutMillis = Long.parseLong(value);
        } else if ("verbose".equalsIgnoreCase(key)) {
            statusConfig.setVerbosity(value);
        } else if ("packages".equalsIgnoreCase(key)) {
            pluginPackages.addAll(Arrays.asList(value.split(Patterns.COMMA_SEPARATOR)));
        } else if ("name".equalsIgnoreCase(key)) {
            setName(value);
        }
    }
    statusConfig.initialize();
}
 

private <B extends LoggableComponentBuilder<? extends ComponentBuilder<?>>> B addLoggersToComponent(
    final B loggerBuilder, final Properties properties) {
    final Map<String, Properties> appenderRefs = PropertiesUtil.partitionOnCommonPrefixes(
        PropertiesUtil.extractSubset(properties, "appenderRef"));
    for (final Map.Entry<String, Properties> entry : appenderRefs.entrySet()) {
        loggerBuilder.add(createAppenderRef(entry.getKey().trim(), entry.getValue()));
    }
    return loggerBuilder;
}
 

private <B extends FilterableComponentBuilder<? extends ComponentBuilder<?>>> B addFiltersToComponent(
    final B componentBuilder, final Properties properties) {
    final Map<String, Properties> filters = PropertiesUtil.partitionOnCommonPrefixes(
        PropertiesUtil.extractSubset(properties, "filter"));
    for (final Map.Entry<String, Properties> entry : filters.entrySet()) {
        componentBuilder.add(createFilter(entry.getKey().trim(), entry.getValue()));
    }
    return componentBuilder;
}
 

private static Class<? extends MessageFactory> createClassForProperty(final String property,
        final Class<ReusableMessageFactory> reusableParameterizedMessageFactoryClass,
        final Class<ParameterizedMessageFactory> parameterizedMessageFactoryClass) {
    try {
        final String fallback = Constants.ENABLE_THREADLOCALS ? reusableParameterizedMessageFactoryClass.getName()
                : parameterizedMessageFactoryClass.getName();
        final String clsName = PropertiesUtil.getProperties().getStringProperty(property, fallback);
        return LoaderUtil.loadClass(clsName).asSubclass(MessageFactory.class);
    } catch (final Throwable t) {
        return parameterizedMessageFactoryClass;
    }
}
 

private static @Nullable Boolean getOptionalBooleanProperty(String name) {
    String value = PropertiesUtil.getProperties().getStringProperty(name);
    if (value == null) {
        return null;
    }

    if (value.equalsIgnoreCase("true")) {
        return Boolean.TRUE;
    } else if (value.equalsIgnoreCase("false"))  {
        return Boolean.FALSE;
    } else {
        LOGGER.warn("Invalid value for boolean input property '{}': {}", name, value);
        return null;
    }
}