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.log4j.core.async;
018    
019    import java.net.URI;
020    import java.util.ArrayList;
021    import java.util.Collections;
022    import java.util.List;
023    
024    import org.apache.logging.log4j.core.LoggerContext;
025    import org.apache.logging.log4j.core.selector.ContextSelector;
026    
027    /**
028     * {@code ContextSelector} that returns the singleton {@code AsyncLoggerContext}.
029     */
030    public class AsyncLoggerContextSelector implements ContextSelector {
031    
032        // LOG4J2-666 ensure unique name across separate instances created by webapp classloaders
033        private static final AsyncLoggerContext CONTEXT = new AsyncLoggerContext("AsyncLoggerContext@"
034                + AsyncLoggerContext.class.hashCode());
035    
036        @Override
037        public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext) {
038            return CONTEXT;
039        }
040    
041        @Override
042        public List<LoggerContext> getLoggerContexts() {
043            final List<LoggerContext> list = new ArrayList<LoggerContext>();
044            list.add(CONTEXT);
045            return Collections.unmodifiableList(list);
046        }
047    
048        @Override
049        public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext,
050                final URI configLocation) {
051            return CONTEXT;
052        }
053    
054        @Override
055        public void removeContext(final LoggerContext context) {
056        }
057    
058    }