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 */
017package org.apache.logging.log4j.core.async;
018
019import java.net.URI;
020import java.util.ArrayList;
021import java.util.Collections;
022import java.util.List;
023
024import org.apache.logging.log4j.core.LoggerContext;
025import org.apache.logging.log4j.core.selector.ContextSelector;
026
027/**
028 * {@code ContextSelector} that returns the singleton {@code AsyncLoggerContext}.
029 */
030public 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}