001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements. See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache license, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License. You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the license for the specific language governing permissions and
015     * limitations under the license.
016     */
017    package org.apache.logging.slf4j;
018    
019    import java.util.concurrent.ConcurrentHashMap;
020    import java.util.concurrent.ConcurrentMap;
021    
022    import org.apache.logging.log4j.MarkerManager;
023    import org.slf4j.IMarkerFactory;
024    import org.slf4j.Marker;
025    
026    /**
027     *
028     */
029    public class Log4jMarkerFactory implements IMarkerFactory {
030    
031        private final ConcurrentMap<String, Marker> markerMap = new ConcurrentHashMap<String, Marker>();
032    
033        /**
034         * Return a Log4j Marker that is compatible with SLF4J.
035         * @param name The name of the Marker.
036         * @return A Marker.
037         */
038        @Override
039        public Marker getMarker(final String name) {
040            if (name == null) {
041                throw new IllegalArgumentException("Marker name must not be null");
042            }
043            Marker marker = markerMap.get(name);
044            if (marker != null) {
045                return marker;
046            }
047            final org.apache.logging.log4j.Marker log4jMarker = MarkerManager.getMarker(name);
048            marker = new Log4jMarker(log4jMarker);
049            final Marker existing = markerMap.putIfAbsent(name, marker);
050            return existing == null ? marker : existing;
051        }
052    
053        /**
054         * Returns true if the Marker exists.
055         * @param name The Marker name.
056         * @return true if the Marker exists, false otherwise.
057         */
058        @Override
059        public boolean exists(final String name) {
060            return markerMap.containsKey(name);
061        }
062    
063        /**
064         * Log4j does not support detached Markers. This method always returns false.
065         * @param name The Marker name.
066         * @return false
067         */
068        @Override
069        public boolean detachMarker(final String name) {
070            return false;
071        }
072    
073        /**
074         * Log4j does not support detached Markers for performance reasons. The returned Marker is attached.
075         * @param name The Marker name.
076         * @return
077         */
078        @Override
079        public Marker getDetachedMarker(final String name) {
080            return getMarker(name);
081        }
082    
083    
084    }