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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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/*
 * Copyright 2006 Niclas Hedhman.
 *
 * 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.ops4j.pax.logging.avalon;

import org.apache.avalon.framework.logger.Logger;
import org.ops4j.pax.logging.PaxLogger;
import org.ops4j.pax.logging.PaxLoggingManager;
import org.ops4j.pax.logging.internal.Activator;
import org.ops4j.pax.logging.spi.support.FallbackLogFactory;
import org.osgi.framework.FrameworkUtil;

/**
 * Unlike with modern (sic!) Logging frameworks like SLF4J and Commons Logging, there's no Avalon-specific
 * factory for its loggers. To make it consistent with other supported facades, this implementation is
 * a factory for loggers.
 */
public class AvalonLogFactory {

    private static PaxLoggingManager m_paxLogging;

    public static void setPaxLoggingManager(PaxLoggingManager manager) {
        m_paxLogging = manager;
    }

    /**
     * Main static factory method to return instance of {@link Logger}.
     * @param name
     * @return
     */
    public static Logger getLogger(String name) {
        return getLogger(null, name);
    }

    public static Logger getLogger(AvalonLogger parent, String name) {
        String newName = parent == null ? name : parent.getName() + "." + name;
        PaxLogger logger;
        if (m_paxLogging == null) {
            logger = FallbackLogFactory.createFallbackLog(FrameworkUtil.getBundle(Logger.class), name);
        } else {
            logger = m_paxLogging.getLogger(newName, AvalonLogger.AVALON_FQCN);
        }
        AvalonLogger avalonLogger = new AvalonLogger(newName, logger);
        if (m_paxLogging == null) {
            synchronized (Activator.m_loggers) {
                Activator.m_loggers.add(avalonLogger);
            }
        }
        return avalonLogger;
    }

}