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;
020
021import org.apache.logging.log4j.core.LoggerContext;
022import org.apache.logging.log4j.core.selector.ClassLoaderContextSelector;
023import org.apache.logging.log4j.core.util.Constants;
024import org.apache.logging.log4j.util.PropertiesUtil;
025
026/**
027 * {@code ContextSelector} that manages {@code AsyncLoggerContext} instances.
028 * <p>
029 * As of version 2.5, this class extends ClassLoaderContextSelector for better web app support.
030 */
031public class AsyncLoggerContextSelector extends ClassLoaderContextSelector {
032
033    /**
034     * Returns {@code true} if the user specified this selector as the Log4jContextSelector, to make all loggers
035     * asynchronous.
036     * 
037     * @return {@code true} if all loggers are asynchronous, {@code false} otherwise.
038     */
039    public static boolean isSelected() {
040        return AsyncLoggerContextSelector.class.getName().equals(
041                PropertiesUtil.getProperties().getStringProperty(Constants.LOG4J_CONTEXT_SELECTOR));
042    }
043
044    @Override
045    protected LoggerContext createContext(final String name, final URI configLocation) {
046        return new AsyncLoggerContext(name, null, configLocation);
047    }
048
049    @Override
050    protected String toContextMapKey(final ClassLoader loader) {
051        // LOG4J2-666 ensure unique name across separate instances created by webapp classloaders
052        return "AsyncContext@" + Integer.toHexString(System.identityHashCode(loader));
053    }
054
055    @Override
056    protected String defaultContextName() {
057        return "DefaultAsyncContext@" + Thread.currentThread().getName();
058    }
059}