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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache license, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the license for the specific language governing permissions and
15   * limitations under the license.
16   */
17  package org.apache.logging.log4j.core.async;
18  
19  import java.net.URI;
20  
21  import org.apache.logging.log4j.core.LoggerContext;
22  import org.apache.logging.log4j.core.selector.ClassLoaderContextSelector;
23  import org.apache.logging.log4j.core.util.Constants;
24  import org.apache.logging.log4j.util.PropertiesUtil;
25  
26  /**
27   * {@code ContextSelector} that manages {@code AsyncLoggerContext} instances.
28   * <p>
29   * As of version 2.5, this class extends ClassLoaderContextSelector for better web app support.
30   */
31  public class AsyncLoggerContextSelector extends ClassLoaderContextSelector {
32  
33      /**
34       * Returns {@code true} if the user specified this selector as the Log4jContextSelector, to make all loggers
35       * asynchronous.
36       * 
37       * @return {@code true} if all loggers are asynchronous, {@code false} otherwise.
38       */
39      public static boolean isSelected() {
40          return AsyncLoggerContextSelector.class.getName().equals(
41                  PropertiesUtil.getProperties().getStringProperty(Constants.LOG4J_CONTEXT_SELECTOR));
42      }
43  
44      @Override
45      protected LoggerContext createContext(final String name, final URI configLocation) {
46          return new AsyncLoggerContext(name, null, configLocation);
47      }
48  
49      @Override
50      protected String toContextMapKey(final ClassLoader loader) {
51          // LOG4J2-666 ensure unique name across separate instances created by webapp classloaders
52          return "AsyncContext@" + Integer.toHexString(System.identityHashCode(loader));
53      }
54  
55      @Override
56      protected String defaultContextName() {
57          return "DefaultAsyncContext@" + Thread.currentThread().getName();
58      }
59  }