/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache license, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License. You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the license for the specific language governing permissions and
   * limitations under the license.
   */
  package org.apache.logging.log4j.core.async;
  
  import java.net.URI;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.logging.log4j.core.LoggerContext;
  import org.apache.logging.log4j.core.selector.ContextSelector;
  
  /**
   * {@code ContextSelector} that returns the singleton {@code AsyncLoggerContext}.
   */
  public class AsyncLoggerContextSelector implements ContextSelector {
  
      // LOG4J2-666 ensure unique name across separate instances created by webapp classloaders
      private static final AsyncLoggerContext CONTEXT = new AsyncLoggerContext("AsyncLoggerContext@"
              + AsyncLoggerContext.class.hashCode());
  
      @Override
      public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext) {
          return CONTEXT;
      }
  
      @Override
      public List<LoggerContext> getLoggerContexts() {
          final List<LoggerContext> list = new ArrayList<LoggerContext>();
          list.add(CONTEXT);
          return Collections.unmodifiableList(list);
      }
  
      @Override
      public LoggerContext getContext(final String fqcn, final ClassLoader loader, final boolean currentContext,
              final URI configLocation) {
          return CONTEXT;
      }
  
      @Override
      public void removeContext(final LoggerContext context) {
      }
  
  }