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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 org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.Marker;
import org.apache.logging.log4j.message.Message;
import org.apache.logging.log4j.util.MessageSupplier;
import org.apache.logging.log4j.util.Supplier;

/**
 * Extends the {@code Logger} interface with methods that facilitate implementing or extending {@code Logger}s. Users
 * should not need to use this interface.
 */
public interface ExtendedLogger extends Logger {

    /**
     * Determines if logging is enabled.
     * 
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The Message.
     * @param t A Throwable.
     * @return True if logging is enabled, false otherwise.
     */
    boolean isEnabled(Level level, Marker marker, Message message, Throwable t);

    /**
     * Determines if logging is enabled.
     * 
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message.
     * @param t A Throwable.
     * @return True if logging is enabled, false otherwise.
     */
    boolean isEnabled(Level level, Marker marker, Object message, Throwable t);

    /**
     * Determines if logging is enabled.
     * 
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message.
     * @return True if logging is enabled, false otherwise.
     * @param t the exception to log, including its stack trace.
     */
    boolean isEnabled(Level level, Marker marker, String message, Throwable t);

    /**
     * Determine if logging is enabled.
     * 
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message.
     * @return True if logging is enabled, false otherwise.
     */
    boolean isEnabled(Level level, Marker marker, String message);

    /**
     * Determines if logging is enabled.
     * 
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message.
     * @param params The parameters.
     * @return True if logging is enabled, false otherwise.
     */
    boolean isEnabled(Level level, Marker marker, String message, Object... params);

    /**
     * Logs a message if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The Message.
     * @param t the exception to log, including its stack trace.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, Message message, Throwable t);

    /**
     * Logs a message if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message.
     * @param t the exception to log, including its stack trace.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, Object message, Throwable t);

    /**
     * Logs a message if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message.
     * @param t the exception to log, including its stack trace.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, String message, Throwable t);

    /**
     * Logs a message if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, String message);

    /**
     * Logs a message if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message format.
     * @param params The message parameters.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, String message, Object... params);

    /**
     * Always logs a message at the specified level. It is the responsibility of the caller to ensure the specified
     * level is enabled.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The Message.
     * @param t the exception to log, including its stack trace.
     */
    void logMessage(String fqcn, Level level, Marker marker, Message message, Throwable t);

    /**
     * Logs a message which is only to be constructed if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param msgSupplier A function, which when called, produces the desired log message.
     * @param t the exception to log, including its stack trace.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, MessageSupplier msgSupplier, Throwable t);

    /**
     * Logs a message whose parameters are only to be constructed if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param message The message format.
     * @param paramSuppliers An array of functions, which when called, produce the desired log message parameters.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, String message, Supplier... paramSuppliers);

    /**
     * Logs a message which is only to be constructed if the specified level is active.
     * 
     * @param fqcn The fully qualified class name of the logger entry point, used to determine the caller class and
     *            method when location information needs to be logged.
     * @param level The logging Level to check.
     * @param marker A Marker or null.
     * @param msgSupplier A function, which when called, produces the desired log message.
     * @param t the exception to log, including its stack trace.
     */
    void logIfEnabled(String fqcn, Level level, Marker marker, Supplier msgSupplier, Throwable t);

}