org.ops4j.pax.logging.slf4j.Slf4jLoggerFactory Maven / Gradle / Ivy

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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.slf4j;

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;
import org.slf4j.ILoggerFactory;
import org.slf4j.Logger;

/**
 * pax-logging specific {@link ILoggerFactory} returned from {@link org.slf4j.impl.StaticLoggerBinder}
 */
public class Slf4jLoggerFactory implements ILoggerFactory {

    static PaxLoggingManager m_paxLogging;

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

    /**
     * Return an appropriate {@link org.slf4j.Logger} instance as specified by the name parameter.
     * Null-valued name arguments are considered invalid.
     *
     * @param name the name of the Logger to return
     */
    @Override
    public Logger getLogger(String name) {
        PaxLogger paxLogger;
        if (m_paxLogging == null) {
            paxLogger = FallbackLogFactory.createFallbackLog(FrameworkUtil.getBundle(Logger.class), name);
        } else {
            paxLogger = m_paxLogging.getLogger(name, Slf4jLogger.SLF4J_FQCN);
        }
        Slf4jLogger logger = new Slf4jLogger(name, paxLogger);
        if (m_paxLogging == null) {
            // just add the logger which PaxLoggingManager need to be replaced.
            synchronized (Activator.m_loggers) {
                Activator.m_loggers.add(logger);
            }
        }
        return logger;
    }

}