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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  import java.util.ArrayList;
21  import java.util.Collections;
22  import java.util.List;
23  
24  import org.apache.logging.log4j.core.LoggerContext;
25  import org.apache.logging.log4j.core.selector.ContextSelector;
26  
27  /**
28   * {@code ContextSelector} that returns the singleton {@code AsyncLoggerContext}.
29   */
30  public class AsyncLoggerContextSelector implements ContextSelector {
31  
32      // LOG4J2-666 ensure unique name across separate instances created by webapp classloaders
33      private static final AsyncLoggerContext CONTEXT = new AsyncLoggerContext("AsyncLoggerContext@"
34              + AsyncLoggerContext.class.hashCode());
35  
36      @Override
37      public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext) {
38          return CONTEXT;
39      }
40  
41      @Override
42      public List<LoggerContext> getLoggerContexts() {
43          final List<LoggerContext> list = new ArrayList<LoggerContext>();
44          list.add(CONTEXT);
45          return Collections.unmodifiableList(list);
46      }
47  
48      @Override
49      public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext,
50              final URI configLocation) {
51          return CONTEXT;
52      }
53  
54      @Override
55      public void removeContext(final LoggerContext context) {
56      }
57  
58  }