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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache license, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the license for the specific language governing permissions and
 * limitations under the license.
 */
package org.apache.logging.log4j.spi;

import java.io.Serializable;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.MarkerManager;
import org.apache.logging.log4j.message.Message;
import org.apache.logging.log4j.message.MessageFactory;
import org.apache.logging.log4j.message.ParameterizedMessageFactory;
import org.apache.logging.log4j.message.StringFormattedMessage;
import org.apache.logging.log4j.status.StatusLogger;
import org.apache.logging.log4j.util.LambdaUtil;
import org.apache.logging.log4j.util.MessageSupplier;
import org.apache.logging.log4j.util.Supplier;

/**
 * Base implementation of a Logger. It is highly recommended that any Logger implementation extend this class.
 */
public abstract class AbstractLogger implements ExtendedLogger, Serializable {

    /**
     * Marker for flow tracing.
     */
    public static final Marker FLOW_MARKER = MarkerManager.getMarker("FLOW");

    /**
     * Marker for method entry tracing.
     */
    public static final Marker ENTRY_MARKER = MarkerManager.getMarker("ENTRY").setParents(FLOW_MARKER);

    /**
     * Marker for method exit tracing.
     */
    public static final Marker EXIT_MARKER = MarkerManager.getMarker("EXIT").setParents(FLOW_MARKER);

    /**
     * Marker for exception tracing.
     */
    public static final Marker EXCEPTION_MARKER = MarkerManager.getMarker("EXCEPTION");

    /**
     * Marker for throwing exceptions.
     */
    public static final Marker THROWING_MARKER = MarkerManager.getMarker("THROWING").setParents(EXCEPTION_MARKER);

    /**
     * Marker for catching exceptions.
     */
    public static final Marker CATCHING_MARKER = MarkerManager.getMarker("CATCHING").setParents(EXCEPTION_MARKER);

    /**
     * The default MessageFactory class.
     */
    public static final Class DEFAULT_MESSAGE_FACTORY_CLASS =
            ParameterizedMessageFactory.class;

    private static final long serialVersionUID = 2L;

    private static final String FQCN = AbstractLogger.class.getName();
    private static final String THROWING = "throwing";
    private static final String CATCHING = "catching";

    private final String name;
    private final MessageFactory messageFactory;

    /**
     * Creates a new logger named after this class (or subclass).
     */
    public AbstractLogger() {
        this.name = getClass().getName();
        this.messageFactory = createDefaultMessageFactory();
    }

    /**
     * Creates a new named logger.
     *
     * @param name the logger name
     */
    public AbstractLogger(final String name) {
        this.name = name;
        this.messageFactory = createDefaultMessageFactory();
    }

    /**
     * Creates a new named logger with a particular {@link MessageFactory}.
     *
     * @param name the logger name
     * @param messageFactory the message factory, if null then use the default message factory.
     */
    public AbstractLogger(final String name, final MessageFactory messageFactory) {
        this.name = name;
        this.messageFactory = messageFactory == null ? createDefaultMessageFactory() : messageFactory;
    }

    /**
     * Checks that the message factory a logger was created with is the same as the given messageFactory. If they are
     * different log a warning to the {@linkplain StatusLogger}. A null MessageFactory translates to the default
     * MessageFactory {@link #DEFAULT_MESSAGE_FACTORY_CLASS}.
     *
     * @param logger The logger to check
     * @param messageFactory The message factory to check.
     */
    public static void checkMessageFactory(final ExtendedLogger logger, final MessageFactory messageFactory) {
        final String name = logger.getName();
        final MessageFactory loggerMessageFactory = logger.getMessageFactory();
        if (messageFactory != null && !loggerMessageFactory.equals(messageFactory)) {
            StatusLogger.getLogger().warn(
                    "The Logger {} was created with the message factory {} and is now requested with the "
                            + "message factory {}, which may create log events with unexpected formatting.", name,
                    loggerMessageFactory, messageFactory);
        } else if (messageFactory == null && !loggerMessageFactory.getClass().equals(DEFAULT_MESSAGE_FACTORY_CLASS)) {
            StatusLogger
                    .getLogger()
                    .warn("The Logger {} was created with the message factory {} and is now requested with a null "
                            + "message factory (defaults to {}), which may create log events with unexpected "
                            + "formatting.",
                            name, loggerMessageFactory, DEFAULT_MESSAGE_FACTORY_CLASS.getName());
        }
    }

    @Override
    public void catching(final Level level, final Throwable t) {
        catching(FQCN, level, t);
    }

    /**
     * Logs a Throwable that has been caught with location information.
     *
     * @param fqcn The fully qualified class name of the caller.
     * @param level The logging level.
     * @param t The Throwable.
     */
    protected void catching(final String fqcn, final Level level, final Throwable t) {
        if (isEnabled(level, CATCHING_MARKER, (Object) null, null)) {
            logMessage(fqcn, level, CATCHING_MARKER, catchingMsg(t), t);
        }
    }

    @Override
    public void catching(final Throwable t) {
        if (isEnabled(Level.ERROR, CATCHING_MARKER, (Object) null, null)) {
            logMessage(FQCN, Level.ERROR, CATCHING_MARKER, catchingMsg(t), t);
        }
    }

    protected Message catchingMsg(final Throwable t) {
        return messageFactory.newMessage(CATCHING);
    }

    private MessageFactory createDefaultMessageFactory() {
        try {
            return DEFAULT_MESSAGE_FACTORY_CLASS.newInstance();
        } catch (final InstantiationException e) {
            throw new IllegalStateException(e);
        } catch (final IllegalAccessException e) {
            throw new IllegalStateException(e);
        }
    }

    @Override
    public void debug(final Marker marker, final Message msg) {
        logIfEnabled(FQCN, Level.DEBUG, marker, msg, null);
    }

    @Override
    public void debug(final Marker marker, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, marker, msg, t);
    }

    @Override
    public void debug(final Marker marker, final Object message) {
        logIfEnabled(FQCN, Level.DEBUG, marker, message, null);
    }

    @Override
    public void debug(final Marker marker, final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, marker, message, t);
    }

    @Override
    public void debug(final Marker marker, final String message) {
        logIfEnabled(FQCN, Level.DEBUG, marker, message, (Throwable) null);
    }

    @Override
    public void debug(final Marker marker, final String message, final Object... params) {
        logIfEnabled(FQCN, Level.DEBUG, marker, message, params);
    }

    @Override
    public void debug(final Marker marker, final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, marker, message, t);
    }

    @Override
    public void debug(final Message msg) {
        logIfEnabled(FQCN, Level.DEBUG, null, msg, null);
    }

    @Override
    public void debug(final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, null, msg, t);
    }

    @Override
    public void debug(final Object message) {
        logIfEnabled(FQCN, Level.DEBUG, null, message, null);
    }

    @Override
    public void debug(final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, null, message, t);
    }

    @Override
    public void debug(final String message) {
        logIfEnabled(FQCN, Level.DEBUG, null, message, (Throwable) null);
    }

    @Override
    public void debug(final String message, final Object... params) {
        logIfEnabled(FQCN, Level.DEBUG, null, message, params);
    }

    @Override
    public void debug(final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, null, message, t);
    }

    @Override
    public void debug(final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.DEBUG, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void debug(final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, null, msgSupplier, t);
    }

    @Override
    public void debug(final Marker marker, final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.DEBUG, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void debug(final Marker marker, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.DEBUG, marker, message, paramSuppliers);
    }

    @Override
    public void debug(final Marker marker, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, marker, msgSupplier, t);
    }

    @Override
    public void debug(final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.DEBUG, null, message, paramSuppliers);
    }

    @Override
    public void debug(final Marker marker, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.DEBUG, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void debug(final Marker marker, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, marker, msgSupplier, t);
    }

    @Override
    public void debug(final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.DEBUG, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void debug(final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.DEBUG, null, msgSupplier, t);
    }

    @Override
    public void entry() {
        entry(FQCN);
    }

    @Override
    public void entry(final Object... params) {
        entry(FQCN, params);
    }

    /**
     * Logs entry to a method with location information.
     *
     * @param fqcn The fully qualified class name of the caller.
     * @param params The parameters to the method.
     */
    protected void entry(final String fqcn, final Object... params) {
        if (isEnabled(Level.TRACE, ENTRY_MARKER, (Object) null, null)) {
            logIfEnabled(fqcn, Level.TRACE, ENTRY_MARKER, entryMsg(params.length, params), null);
        }
    }

    protected Message entryMsg(final int count, final Object... params) {
        if (count == 0) {
            return messageFactory.newMessage("entry");
        }
        final StringBuilder sb = new StringBuilder("entry params(");
        for (int i = 0; i < params.length; i++) {
            Object parm = params[i];
            sb.append(parm != null ? parm.toString() : "null");
            if (i + 1 < params.length) {
                sb.append(", ");
            }
        }
        sb.append(')');
        return messageFactory.newMessage(sb.toString());
    }

    @Override
    public void error(final Marker marker, final Message msg) {
        logIfEnabled(FQCN, Level.ERROR, marker, msg, null);
    }

    @Override
    public void error(final Marker marker, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, marker, msg, t);
    }

    @Override
    public void error(final Marker marker, final Object message) {
        logIfEnabled(FQCN, Level.ERROR, marker, message, null);
    }

    @Override
    public void error(final Marker marker, final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, marker, message, t);
    }

    @Override
    public void error(final Marker marker, final String message) {
        logIfEnabled(FQCN, Level.ERROR, marker, message, (Throwable) null);
    }

    @Override
    public void error(final Marker marker, final String message, final Object... params) {
        logIfEnabled(FQCN, Level.ERROR, marker, message, params);
    }

    @Override
    public void error(final Marker marker, final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, marker, message, t);
    }

    @Override
    public void error(final Message msg) {
        logIfEnabled(FQCN, Level.ERROR, null, msg, null);
    }

    @Override
    public void error(final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, null, msg, t);
    }

    @Override
    public void error(final Object message) {
        logIfEnabled(FQCN, Level.ERROR, null, message, null);
    }

    @Override
    public void error(final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, null, message, t);
    }

    @Override
    public void error(final String message) {
        logIfEnabled(FQCN, Level.ERROR, null, message, (Throwable) null);
    }

    @Override
    public void error(final String message, final Object... params) {
        logIfEnabled(FQCN, Level.ERROR, null, message, params);
    }

    @Override
    public void error(final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, null, message, t);
    }

    @Override
    public void error(final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.ERROR, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void error(final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, null, msgSupplier, t);
    }

    @Override
    public void error(final Marker marker, final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.ERROR, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void error(final Marker marker, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.ERROR, marker, message, paramSuppliers);
    }

    @Override
    public void error(final Marker marker, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, marker, msgSupplier, t);
    }

    @Override
    public void error(final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.ERROR, null, message, paramSuppliers);
    }

    @Override
    public void error(final Marker marker, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.ERROR, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void error(final Marker marker, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, marker, msgSupplier, t);
    }

    @Override
    public void error(final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.ERROR, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void error(final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.ERROR, null, msgSupplier, t);
    }

    @Override
    public void exit() {
        exit(FQCN, null);
    }

    @Override
    public  R exit(final R result) {
        return exit(FQCN, result);
    }

    /**
     * Logs exiting from a method with the result and location information.
     *
     * @param fqcn The fully qualified class name of the caller.
     * @param  The type of the parameter and object being returned.
     * @param result The result being returned from the method call.
     * @return the return value passed to this method.
     */
    protected  R exit(final String fqcn, final R result) {
        if (isEnabled(Level.TRACE, EXIT_MARKER, (Object) null, null)) {
            logIfEnabled(fqcn, Level.TRACE, EXIT_MARKER, exitMsg(result), null);
        }
        return result;
    }

    protected Message exitMsg(final Object result) {
        if (result == null) {
            return messageFactory.newMessage("exit");
        }
        return messageFactory.newMessage("exit with(" + result + ')');
    }

    @Override
    public void fatal(final Marker marker, final Message msg) {
        logIfEnabled(FQCN, Level.FATAL, marker, msg, null);
    }

    @Override
    public void fatal(final Marker marker, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, marker, msg, t);
    }

    @Override
    public void fatal(final Marker marker, final Object message) {
        logIfEnabled(FQCN, Level.FATAL, marker, message, null);
    }

    @Override
    public void fatal(final Marker marker, final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, marker, message, t);
    }

    @Override
    public void fatal(final Marker marker, final String message) {
        logIfEnabled(FQCN, Level.FATAL, marker, message, (Throwable) null);
    }

    @Override
    public void fatal(final Marker marker, final String message, final Object... params) {
        logIfEnabled(FQCN, Level.FATAL, marker, message, params);
    }

    @Override
    public void fatal(final Marker marker, final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, marker, message, t);
    }

    @Override
    public void fatal(final Message msg) {
        logIfEnabled(FQCN, Level.FATAL, null, msg, null);
    }

    @Override
    public void fatal(final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, null, msg, t);
    }

    @Override
    public void fatal(final Object message) {
        logIfEnabled(FQCN, Level.FATAL, null, message, null);
    }

    @Override
    public void fatal(final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, null, message, t);
    }

    @Override
    public void fatal(final String message) {
        logIfEnabled(FQCN, Level.FATAL, null, message, (Throwable) null);
    }

    @Override
    public void fatal(final String message, final Object... params) {
        logIfEnabled(FQCN, Level.FATAL, null, message, params);
    }

    @Override
    public void fatal(final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, null, message, t);
    }

    @Override
    public void fatal(final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.FATAL, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void fatal(final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, null, msgSupplier, t);
    }

    @Override
    public void fatal(final Marker marker, final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.FATAL, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void fatal(final Marker marker, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.FATAL, marker, message, paramSuppliers);
    }

    @Override
    public void fatal(final Marker marker, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, marker, msgSupplier, t);
    }

    @Override
    public void fatal(final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.FATAL, null, message, paramSuppliers);
    }

    @Override
    public void fatal(final Marker marker, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.FATAL, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void fatal(final Marker marker, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, marker, msgSupplier, t);
    }

    @Override
    public void fatal(final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.FATAL, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void fatal(final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.FATAL, null, msgSupplier, t);
    }

    @Override
    public MessageFactory getMessageFactory() {
        return messageFactory;
    }

    @Override
    public String getName() {
        return name;
    }

    @Override
    public void info(final Marker marker, final Message msg) {
        logIfEnabled(FQCN, Level.INFO, marker, msg, null);
    }

    @Override
    public void info(final Marker marker, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, marker, msg, t);
    }

    @Override
    public void info(final Marker marker, final Object message) {
        logIfEnabled(FQCN, Level.INFO, marker, message, null);
    }

    @Override
    public void info(final Marker marker, final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, marker, message, t);
    }

    @Override
    public void info(final Marker marker, final String message) {
        logIfEnabled(FQCN, Level.INFO, marker, message, (Throwable) null);
    }

    @Override
    public void info(final Marker marker, final String message, final Object... params) {
        logIfEnabled(FQCN, Level.INFO, marker, message, params);
    }

    @Override
    public void info(final Marker marker, final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, marker, message, t);
    }

    @Override
    public void info(final Message msg) {
        logIfEnabled(FQCN, Level.INFO, null, msg, null);
    }

    @Override
    public void info(final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, null, msg, t);
    }

    @Override
    public void info(final Object message) {
        logIfEnabled(FQCN, Level.INFO, null, message, null);
    }

    @Override
    public void info(final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, null, message, t);
    }

    @Override
    public void info(final String message) {
        logIfEnabled(FQCN, Level.INFO, null, message, (Throwable) null);
    }

    @Override
    public void info(final String message, final Object... params) {
        logIfEnabled(FQCN, Level.INFO, null, message, params);
    }

    @Override
    public void info(final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, null, message, t);
    }

    @Override
    public void info(final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.INFO, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void info(final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, null, msgSupplier, t);
    }

    @Override
    public void info(final Marker marker, final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.INFO, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void info(final Marker marker, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.INFO, marker, message, paramSuppliers);
    }

    @Override
    public void info(final Marker marker, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, marker, msgSupplier, t);
    }

    @Override
    public void info(final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.INFO, null, message, paramSuppliers);
    }

    @Override
    public void info(final Marker marker, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.INFO, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void info(final Marker marker, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, marker, msgSupplier, t);
    }

    @Override
    public void info(final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.INFO, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void info(final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.INFO, null, msgSupplier, t);
    }

    @Override
    public boolean isDebugEnabled() {
        return isEnabled(Level.DEBUG, null, null);
    }

    @Override
    public boolean isDebugEnabled(final Marker marker) {
        return isEnabled(Level.DEBUG, marker, (Object) null, null);
    }

    @Override
    public boolean isEnabled(final Level level) {
        return isEnabled(level, null, (Object) null, null);
    }

    @Override
    public boolean isEnabled(final Level level, final Marker marker) {
        return isEnabled(level, marker, (Object) null, null);
    }

    @Override
    public boolean isErrorEnabled() {
        return isEnabled(Level.ERROR, null, (Object) null, null);
    }

    @Override
    public boolean isErrorEnabled(final Marker marker) {
        return isEnabled(Level.ERROR, marker, (Object) null, null);
    }

    @Override
    public boolean isFatalEnabled() {
        return isEnabled(Level.FATAL, null, (Object) null, null);
    }

    @Override
    public boolean isFatalEnabled(final Marker marker) {
        return isEnabled(Level.FATAL, marker, (Object) null, null);
    }

    @Override
    public boolean isInfoEnabled() {
        return isEnabled(Level.INFO, null, (Object) null, null);
    }

    @Override
    public boolean isInfoEnabled(final Marker marker) {
        return isEnabled(Level.INFO, marker, (Object) null, null);
    }

    @Override
    public boolean isTraceEnabled() {
        return isEnabled(Level.TRACE, null, (Object) null, null);
    }

    @Override
    public boolean isTraceEnabled(final Marker marker) {
        return isEnabled(Level.TRACE, marker, (Object) null, null);
    }

    @Override
    public boolean isWarnEnabled() {
        return isEnabled(Level.WARN, null, (Object) null, null);
    }

    @Override
    public boolean isWarnEnabled(final Marker marker) {
        return isEnabled(Level.WARN, marker, (Object) null, null);
    }

    @Override
    public void log(final Level level, final Marker marker, final Message msg) {
        logIfEnabled(FQCN, level, marker, msg, (Throwable) null);
    }

    @Override
    public void log(final Level level, final Marker marker, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, level, marker, msg, t);
    }

    @Override
    public void log(final Level level, final Marker marker, final Object message) {
        logIfEnabled(FQCN, level, marker, message, (Throwable) null);
    }

    @Override
    public void log(final Level level, final Marker marker, final Object message, final Throwable t) {
        if (isEnabled(level, marker, message, t)) {
            logMessage(FQCN, level, marker, message, t);
        }
    }

    @Override
    public void log(final Level level, final Marker marker, final String message) {
        logIfEnabled(FQCN, level, marker, message, (Throwable) null);
    }

    @Override
    public void log(final Level level, final Marker marker, final String message, final Object... params) {
        logIfEnabled(FQCN, level, marker, message, params);
    }

    @Override
    public void log(final Level level, final Marker marker, final String message, final Throwable t) {
        logIfEnabled(FQCN, level, marker, message, t);
    }

    @Override
    public void log(final Level level, final Message msg) {
        logIfEnabled(FQCN, level, null, msg, null);
    }

    @Override
    public void log(final Level level, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, level, null, msg, t);
    }

    @Override
    public void log(final Level level, final Object message) {
        logIfEnabled(FQCN, level, null, message, null);
    }

    @Override
    public void log(final Level level, final Object message, final Throwable t) {
        logIfEnabled(FQCN, level, null, message, t);
    }

    @Override
    public void log(final Level level, final String message) {
        logIfEnabled(FQCN, level, null, message, (Throwable) null);
    }

    @Override
    public void log(final Level level, final String message, final Object... params) {
        logIfEnabled(FQCN, level, null, message, params);
    }

    @Override
    public void log(final Level level, final String message, final Throwable t) {
        logIfEnabled(FQCN, level, null, message, t);
    }

    @Override
    public void log(final Level level, final Supplier msgSupplier) {
        logIfEnabled(FQCN, level, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void log(final Level level, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, level, null, msgSupplier, t);
    }

    @Override
    public void log(final Level level, final Marker marker, final Supplier msgSupplier) {
        logIfEnabled(FQCN, level, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void log(final Level level, final Marker marker, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, level, marker, message, paramSuppliers);
    }

    @Override
    public void log(final Level level, final Marker marker, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, level, marker, msgSupplier, t);
    }

    @Override
    public void log(final Level level, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, level, null, message, paramSuppliers);
    }

    @Override
    public void log(final Level level, final Marker marker, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, level, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void log(final Level level, final Marker marker, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, level, marker, msgSupplier, t);
    }

    @Override
    public void log(final Level level, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, level, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void log(final Level level, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, level, null, msgSupplier, t);
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker, final Message msg,
            final Throwable t) {
        if (isEnabled(level, marker, msg, t)) {
            logMessage(fqcn, level, marker, msg, t);
        }
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker,
            final MessageSupplier msgSupplier, final Throwable t) {
        if (isEnabled(level, marker, msgSupplier, t)) {
            logMessage(fqcn, level, marker, msgSupplier, t);
        }
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker, final Object message,
            final Throwable t) {
        if (isEnabled(level, marker, message, t)) {
            logMessage(fqcn, level, marker, message, t);
        }
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker, final Supplier msgSupplier,
            final Throwable t) {
        if (isEnabled(level, marker, msgSupplier, t)) {
            logMessage(fqcn, level, marker, msgSupplier, t);
        }
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker, final String message) {
        if (isEnabled(level, marker, message)) {
            logMessage(fqcn, level, marker, message);
        }
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker, final String message,
            final Supplier... paramSuppliers) {
        if (isEnabled(level, marker, message)) {
            logMessage(fqcn, level, marker, message, paramSuppliers);
        }
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker, final String message,
            final Object... params) {
        if (isEnabled(level, marker, message, params)) {
            logMessage(fqcn, level, marker, message, params);
        }
    }

    @Override
    public void logIfEnabled(final String fqcn, final Level level, final Marker marker, final String message,
            final Throwable t) {
        if (isEnabled(level, marker, message, t)) {
            logMessage(fqcn, level, marker, message, t);
        }
    }

    protected void logMessage(final String fqcn, final Level level, final Marker marker, final Object message,
            final Throwable t) {
        logMessage(fqcn, level, marker, messageFactory.newMessage(message), t);
    }

    protected void logMessage(final String fqcn, final Level level, final Marker marker,
            final MessageSupplier msgSupplier, final Throwable t) {
        final Message message = LambdaUtil.get(msgSupplier);
        logMessage(fqcn, level, marker, message, t);
    }

    protected void logMessage(final String fqcn, final Level level, final Marker marker, final Supplier msgSupplier,
            final Throwable t) {
        final Object message = LambdaUtil.get(msgSupplier);
        logMessage(fqcn, level, marker, messageFactory.newMessage(message), t);
    }

    protected void logMessage(final String fqcn, final Level level, final Marker marker, final String message,
            final Throwable t) {
        logMessage(fqcn, level, marker, messageFactory.newMessage(message), t);
    }

    protected void logMessage(final String fqcn, final Level level, final Marker marker, final String message) {
        final Message msg = messageFactory.newMessage(message);
        logMessage(fqcn, level, marker, msg, msg.getThrowable());
    }

    protected void logMessage(final String fqcn, final Level level, final Marker marker, final String message,
            final Object... params) {
        final Message msg = messageFactory.newMessage(message, params);
        logMessage(fqcn, level, marker, msg, msg.getThrowable());
    }

    protected void logMessage(final String fqcn, final Level level, final Marker marker, final String message,
            final Supplier... paramSuppliers) {
        final Message msg = messageFactory.newMessage(message, LambdaUtil.getAll(paramSuppliers));
        logMessage(fqcn, level, marker, msg, msg.getThrowable());
    }

    @Override
    public void printf(final Level level, final Marker marker, final String format, final Object... params) {
        if (isEnabled(level, marker, format, params)) {
            final Message msg = new StringFormattedMessage(format, params);
            logMessage(FQCN, level, marker, msg, msg.getThrowable());
        }
    }

    @Override
    public void printf(final Level level, final String format, final Object... params) {
        if (isEnabled(level, null, format, params)) {
            final Message msg = new StringFormattedMessage(format, params);
            logMessage(FQCN, level, null, msg, msg.getThrowable());
        }
    }

    @Override
    public  T throwing(final T t) {
        return throwing(FQCN, Level.ERROR, t);
    }

    @Override
    public  T throwing(final Level level, final T t) {
        return throwing(FQCN, level, t);
    }

    /**
     * Logs a Throwable to be thrown.
     *
     * @param  the type of the Throwable.
     * @param fqcn the fully qualified class name of this Logger implementation.
     * @param level The logging Level.
     * @param t The Throwable.
     * @return the Throwable.
     */
    protected  T throwing(final String fqcn, final Level level, final T t) {
        if (isEnabled(level, THROWING_MARKER, (Object) null, null)) {
            logMessage(fqcn, level, THROWING_MARKER, throwingMsg(t), t);
        }
        return t;
    }

    protected Message throwingMsg(final Throwable t) {
        return messageFactory.newMessage(THROWING);
    }

    @Override
    public void trace(final Marker marker, final Message msg) {
        logIfEnabled(FQCN, Level.TRACE, marker, msg, null);
    }

    @Override
    public void trace(final Marker marker, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, marker, msg, t);
    }

    @Override
    public void trace(final Marker marker, final Object message) {
        logIfEnabled(FQCN, Level.TRACE, marker, message, null);
    }

    @Override
    public void trace(final Marker marker, final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, marker, message, t);
    }

    @Override
    public void trace(final Marker marker, final String message) {
        logIfEnabled(FQCN, Level.TRACE, marker, message, (Throwable) null);
    }

    @Override
    public void trace(final Marker marker, final String message, final Object... params) {
        logIfEnabled(FQCN, Level.TRACE, marker, message, params);
    }

    @Override
    public void trace(final Marker marker, final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, marker, message, t);
    }

    @Override
    public void trace(final Message msg) {
        logIfEnabled(FQCN, Level.TRACE, null, msg, null);
    }

    @Override
    public void trace(final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, null, msg, t);
    }

    @Override
    public void trace(final Object message) {
        logIfEnabled(FQCN, Level.TRACE, null, message, null);
    }

    @Override
    public void trace(final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, null, message, t);
    }

    @Override
    public void trace(final String message) {
        logIfEnabled(FQCN, Level.TRACE, null, message, (Throwable) null);
    }

    @Override
    public void trace(final String message, final Object... params) {
        logIfEnabled(FQCN, Level.TRACE, null, message, params);
    }

    @Override
    public void trace(final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, null, message, t);
    }

    @Override
    public void trace(final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.TRACE, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void trace(final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, null, msgSupplier, t);
    }

    @Override
    public void trace(final Marker marker, final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.TRACE, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void trace(final Marker marker, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.TRACE, marker, message, paramSuppliers);
    }

    @Override
    public void trace(final Marker marker, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, marker, msgSupplier, t);
    }

    @Override
    public void trace(final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.TRACE, null, message, paramSuppliers);
    }

    @Override
    public void trace(final Marker marker, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.TRACE, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void trace(final Marker marker, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, marker, msgSupplier, t);
    }

    @Override
    public void trace(final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.TRACE, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void trace(final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.TRACE, null, msgSupplier, t);
    }

    @Override
    public void warn(final Marker marker, final Message msg) {
        logIfEnabled(FQCN, Level.WARN, marker, msg, null);
    }

    @Override
    public void warn(final Marker marker, final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, marker, msg, t);
    }

    @Override
    public void warn(final Marker marker, final Object message) {
        logIfEnabled(FQCN, Level.WARN, marker, message, null);
    }

    @Override
    public void warn(final Marker marker, final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, marker, message, t);
    }

    @Override
    public void warn(final Marker marker, final String message) {
        logIfEnabled(FQCN, Level.WARN, marker, message, (Throwable) null);
    }

    @Override
    public void warn(final Marker marker, final String message, final Object... params) {
        logIfEnabled(FQCN, Level.WARN, marker, message, params);
    }

    @Override
    public void warn(final Marker marker, final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, marker, message, t);
    }

    @Override
    public void warn(final Message msg) {
        logIfEnabled(FQCN, Level.WARN, null, msg, null);
    }

    @Override
    public void warn(final Message msg, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, null, msg, t);
    }

    @Override
    public void warn(final Object message) {
        logIfEnabled(FQCN, Level.WARN, null, message, null);
    }

    @Override
    public void warn(final Object message, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, null, message, t);
    }

    @Override
    public void warn(final String message) {
        logIfEnabled(FQCN, Level.WARN, null, message, (Throwable) null);
    }

    @Override
    public void warn(final String message, final Object... params) {
        logIfEnabled(FQCN, Level.WARN, null, message, params);
    }

    @Override
    public void warn(final String message, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, null, message, t);
    }

    @Override
    public void warn(final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.WARN, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void warn(final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, null, msgSupplier, t);
    }

    @Override
    public void warn(final Marker marker, final Supplier msgSupplier) {
        logIfEnabled(FQCN, Level.WARN, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void warn(final Marker marker, final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.WARN, marker, message, paramSuppliers);
    }

    @Override
    public void warn(final Marker marker, final Supplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, marker, msgSupplier, t);
    }

    @Override
    public void warn(final String message, final Supplier... paramSuppliers) {
        logIfEnabled(FQCN, Level.WARN, null, message, paramSuppliers);
    }

    @Override
    public void warn(final Marker marker, final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.WARN, marker, msgSupplier, (Throwable) null);
    }

    @Override
    public void warn(final Marker marker, final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, marker, msgSupplier, t);
    }

    @Override
    public void warn(final MessageSupplier msgSupplier) {
        logIfEnabled(FQCN, Level.WARN, null, msgSupplier, (Throwable) null);
    }

    @Override
    public void warn(final MessageSupplier msgSupplier, final Throwable t) {
        logIfEnabled(FQCN, Level.WARN, null, msgSupplier, t);
    }
}