org.osgi.service.log.LoggerFactory Maven / Gradle / Ivy
/*
* Copyright (c) OSGi Alliance (2016). 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;
import org.osgi.framework.Bundle;
/**
* Logger Factory service for logging information.
*
* Provides methods for bundles to obtain named {@link Logger}s that can be used
* to write messages to the log.
*
* Logger names should be in the form of a fully qualified Java class names with
* segments separated by full stop ({@code '.'} \u002E). For example:
*
*
* com.foo.Bar
*
*
* Logger names exist in a hierarchy. A logger name is said to be an ancestor of
* another logger name if the logger name followed by a full stop ({@code '.'}
* \u002E) is a prefix of the descendant logger name. The
* {@link Logger#ROOT_LOGGER_NAME root logger name} is the top ancestor of the
* logger name hierarchy. For example:
*
*
* com.foo.Bar
* com.foo
* com
* ROOT
*
*
* @ThreadSafe
* @since 1.4
* @author $Id: 61d256f03473600a4d3fc130094feabc7823f6a0 $
*/
@ProviderType
public interface LoggerFactory {
/**
* Return the {@link Logger} named with the specified name.
*
* @param name The name to use for the logger name.
* @return The {@link Logger} named with the specified name. If the name
* parameter is equal to {@link Logger#ROOT_LOGGER_NAME}, then the
* root logger is returned.
*/
Logger getLogger(String name);
/**
* Return the {@link Logger} named with the specified class.
*
* @param clazz The class to use for the logger name.
* @return The {@link Logger} named with the name of the specified class.
*/
Logger getLogger(Class< ? > clazz);
/**
* Return the {@link Logger} of the specified type named with the specified
* name.
*
* @param The Logger type.
* @param name The name to use for the logger name.
* @param loggerType The type of Logger. Can be {@link Logger} or
* {@link FormatterLogger}.
* @return The {@link Logger} or {@link FormatterLogger} named with the
* specified name. If the name parameter is equal to
* {@link Logger#ROOT_LOGGER_NAME}, then the root logger is
* returned.
* @throws IllegalArgumentException If the specified type is not a supported
* Logger type.
*/
L getLogger(String name, Class loggerType);
/**
* Return the {@link Logger} of the specified type named with the specified
* class.
*
* @param A Logger type.
* @param clazz The class to use for the logger name.
* @param loggerType The type of Logger. Can be {@link Logger} or
* {@link FormatterLogger}.
* @return The {@link Logger} or {@link FormatterLogger} named with the name
* of the specified class.
* @throws IllegalArgumentException If the specified type is not a supported
* Logger type.
*/
L getLogger(Class< ? > clazz, Class loggerType);
/**
* Return the {@link Logger} of the specified type named with the specified
* name for the specified bundle.
*
* This method is not normally used. The other {@code getLogger} methods
* return a {@link Logger} associated with the bundle used to obtain this
* Logger Factory service. This method is used to obtain a {@link Logger}
* for the specified bundle which may be useful to code which is logging on
* behalf of another bundle.
*
* @param The Logger type.
* @param bundle The bundle associated with the Logger.
* @param name The name to use for the logger name.
* @param loggerType The type of Logger. Can be {@link Logger} or
* {@link FormatterLogger}.
* @return The {@link Logger} or {@link FormatterLogger} named with the
* specified name for the specified bundle. If the name parameter is
* equal to {@link Logger#ROOT_LOGGER_NAME}, then the root logger is
* returned.
* @throws IllegalArgumentException If the specified type is not a supported
* Logger type or the specified Bundle is not a resolved bundle.
*/
L getLogger(Bundle bundle, String name,
Class loggerType);
}