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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  }