content: /*
   * 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.bookkeeper.common.conf;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import java.util.Iterator;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  import org.apache.commons.configuration2.AbstractConfiguration;
  import org.apache.commons.configuration2.convert.DefaultListDelimiterHandler;
  
  /**
   * Configuration view built on concurrent hash map for fast thread-safe access.
   *
   * <p>Notes: Multi-property list aggregation will not work in this class. I.e. commons config
   * normally combines all properties with the same key into one list property automatically.
   * This class simply overwrites any existing mapping.
   */
  @SuppressWarnings("unchecked")
  public class ConcurrentConfiguration extends AbstractConfiguration {
  
      private final ConcurrentMap<String, Object> map;
  
      public ConcurrentConfiguration() {
          setListDelimiterHandler(new DefaultListDelimiterHandler(','));
          this.map = new ConcurrentHashMap<>();
      }
  
      @Override
      protected void addPropertyDirect(String key, Object value) {
          checkNotNull(value);
          map.put(key, value);
      }
  
      @Override
      public Object getPropertyInternal(String key) {
          return map.get(key);
      }
  
      @Override
      public Iterator getKeysInternal() {
          return map.keySet().iterator();
      }
  
      @Override
      public boolean containsKeyInternal(String key) {
          return map.containsKey(key);
      }
  
      @Override
      protected boolean containsValueInternal(Object o) {
          return map.containsValue(o);
      }
  
      @Override
      public boolean isEmptyInternal() {
          return map.isEmpty();
      }
  
      @Override
      protected void clearPropertyDirect(String key) {
          map.remove(key);
      }
  }
  