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/*
* Copyright (c) OSGi Alliance (2016, 2018). All Rights Reserved.
*
* Licensed 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.osgi.service.log;
import org.osgi.annotation.versioning.ProviderType;
/**
* Provides methods for bundles to write messages to the log using SLF4J-style
* format strings.
*
* Messages can be formatted by the Logger once the Logger determines the log
* level is enabled. Use a left curly bracket ('{' \u007B)
* followed by a right curly bracket ('}' \u007D) as a place
* holder for an argument: "{}". If you need to use the literal
* "{}" in the formatted message, precede the place holder with a
* reverse solidus ({@code '\'} \u005C): "\{}". If you need to
* place a backslash before the place holder, precede the reverse solidus with a
* reverse solidus: "\\{}".
*
* You can also add a {@code Throwable} and/or {@code ServiceReference} to the
* generated {@link LogEntry} by passing them to the logging methods as
* additional arguments. If the last argument is a {@code Throwable} or a
* {@code ServiceReference}, it is added to the generated {@link LogEntry} and
* then, if the next to last argument is a {@code ServiceReference} or
* {@code Throwable} and not the same type as the last argument, it is also
* added to the generated {@link LogEntry}. These arguments will not be used as
* message arguments. For example:
*
*
* logger.info("Found service {}.", serviceReference, serviceReference);
* logger.warn("Something named {} happened.", name, serviceReference,
* throwable);
* logger.error("Failed.", exception);
*
*
* @ThreadSafe
* @author $Id: df0972be1005fb5a009ffab7b8b59704d0ae2f94 $
* @since 1.4
*/
@ProviderType
public interface Logger {
/**
* Root Logger Name.
*/
String ROOT_LOGGER_NAME = "ROOT";
/**
* Return the name of this Logger.
*
* @return The name of this Logger.
*/
String getName();
/**
* Is logging enabled for the {@link LogLevel#TRACE} level?
*
* @return {@code true} if logging is enabled for the {@link LogLevel#TRACE}
* level.
*/
boolean isTraceEnabled();
/**
* Log a message at the {@link LogLevel#TRACE} level.
*
* @param message The message to log.
*/
void trace(String message);
/**
* Log a formatted message at the {@link LogLevel#TRACE} level.
*
* @param format The format of the message to log.
* @param arg The argument to format into the message.
*/
void trace(String format, Object arg);
/**
* Log a formatted message at the {@link LogLevel#TRACE} level.
*
* @param format The format of the message to log.
* @param arg1 The first argument to format into the message.
* @param arg2 The second argument to format into the message.
*/
void trace(String format, Object arg1, Object arg2);
/**
* Log a formatted message at the {@link LogLevel#TRACE} level.
*
* @param format The format of the message to log.
* @param arguments The arguments to format into the message.
*/
void trace(String format, Object... arguments);
/**
* Perform the specified operation if logging enabled for the
* {@link LogLevel#TRACE} level.
*
* @param consumer The operation to perform on this Logger.
* @throws E An exception thrown by the operation.
*/
void trace(LoggerConsumer consumer) throws E;
/**
* Is logging enabled for the {@link LogLevel#DEBUG} level?
*
* @return {@code true} if logging is enabled for the {@link LogLevel#DEBUG}
* level.
*/
boolean isDebugEnabled();
/**
* Log a message at the {@link LogLevel#DEBUG} level.
*
* @param message The message to log.
*/
void debug(String message);
/**
* Log a formatted message at the {@link LogLevel#DEBUG} level.
*
* @param format The format of the message to log.
* @param arg The argument to format into the message.
*/
void debug(String format, Object arg);
/**
* Log a formatted message at the {@link LogLevel#DEBUG} level.
*
* @param format The format of the message to log.
* @param arg1 The first argument to format into the message.
* @param arg2 The second argument to format into the message.
*/
void debug(String format, Object arg1, Object arg2);
/**
* Log a formatted message at the {@link LogLevel#DEBUG} level.
*
* @param format The format of the message to log.
* @param arguments The arguments to format into the message.
*/
void debug(String format, Object... arguments);
/**
* Perform the specified operation if logging enabled for the
* {@link LogLevel#DEBUG} level.
*
* @param consumer The operation to perform on this Logger.
* @throws E An exception thrown by the operation.
*/
void debug(LoggerConsumer consumer) throws E;
/**
* Is logging enabled for the {@link LogLevel#INFO} level?
*
* @return {@code true} if logging is enabled for the {@link LogLevel#INFO}
* level.
*/
boolean isInfoEnabled();
/**
* Log a message at the {@link LogLevel#INFO} level.
*
* @param message The message to log.
*/
void info(String message);
/**
* Log a formatted message at the {@link LogLevel#INFO} level.
*
* @param format The format of the message to log.
* @param arg The argument to format into the message.
*/
void info(String format, Object arg);
/**
* Log a formatted message at the {@link LogLevel#INFO} level.
*
* @param format The format of the message to log.
* @param arg1 The first argument to format into the message.
* @param arg2 The second argument to format into the message.
*/
void info(String format, Object arg1, Object arg2);
/**
* Log a formatted message at the {@link LogLevel#INFO} level.
*
* @param format The format of the message to log.
* @param arguments The arguments to format into the message.
*/
void info(String format, Object... arguments);
/**
* Perform the specified operation if logging enabled for the
* {@link LogLevel#INFO} level.
*
* @param consumer The operation to perform on this Logger.
* @throws E An exception thrown by the operation.
*/
void info(LoggerConsumer consumer) throws E;
/**
* Is logging enabled for the {@link LogLevel#WARN} level?
*
* @return {@code true} if logging is enabled for the {@link LogLevel#WARN}
* level.
*/
boolean isWarnEnabled();
/**
* Log a message at the {@link LogLevel#WARN} level.
*
* @param message The message to log.
*/
void warn(String message);
/**
* Log a formatted message at the {@link LogLevel#WARN} level.
*
* @param format The format of the message to log.
* @param arg The argument to format into the message.
*/
void warn(String format, Object arg);
/**
* Log a formatted message at the {@link LogLevel#WARN} level.
*
* @param format The format of the message to log.
* @param arg1 The first argument to format into the message.
* @param arg2 The second argument to format into the message.
*/
void warn(String format, Object arg1, Object arg2);
/**
* Log a formatted message at the {@link LogLevel#WARN} level.
*
* @param format The format of the message to log.
* @param arguments The arguments to format into the message.
*/
void warn(String format, Object... arguments);
/**
* Perform the specified operation if logging enabled for the
* {@link LogLevel#WARN} level.
*
* @param consumer The operation to perform on this Logger.
* @throws E An exception thrown by the operation.
*/
void warn(LoggerConsumer consumer) throws E;
/**
* Is logging enabled for the {@link LogLevel#ERROR} level?
*
* @return {@code true} if logging is enabled for the {@link LogLevel#ERROR}
* level.
*/
boolean isErrorEnabled();
/**
* Log a message at the {@link LogLevel#ERROR} level.
*
* @param message The message to log.
*/
void error(String message);
/**
* Log a formatted message at the {@link LogLevel#ERROR} level.
*
* @param format The format of the message to log.
* @param arg The argument to format into the message.
*/
void error(String format, Object arg);
/**
* Log a formatted message at the {@link LogLevel#ERROR} level.
*
* @param format The format of the message to log.
* @param arg1 The first argument to format into the message.
* @param arg2 The second argument to format into the message.
*/
void error(String format, Object arg1, Object arg2);
/**
* Log a formatted message at the {@link LogLevel#ERROR} level.
*
* @param format The format of the message to log.
* @param arguments The arguments to format into the message.
*/
void error(String format, Object... arguments);
/**
* Perform the specified operation if logging enabled for the
* {@link LogLevel#ERROR} level.
*
* @param consumer The operation to perform on this Logger.
* @throws E An exception thrown by the operation.
*/
void error(LoggerConsumer consumer) throws E;
/**
* Log a message at the {@link LogLevel#AUDIT} level.
*
* @param message The message to log.
*/
void audit(String message);
/**
* Log a formatted message at the {@link LogLevel#AUDIT} level.
*
* @param format The format of the message to log.
* @param arg The argument to format into the message.
*/
void audit(String format, Object arg);
/**
* Log a formatted message at the {@link LogLevel#AUDIT} level.
*
* @param format The format of the message to log.
* @param arg1 The first argument to format into the message.
* @param arg2 The second argument to format into the message.
*/
void audit(String format, Object arg1, Object arg2);
/**
* Log a formatted message at the {@link LogLevel#AUDIT} level.
*
* @param format The format of the message to log.
* @param arguments The arguments to format into the message.
*/
void audit(String format, Object... arguments);
}