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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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.jboss.netty.channel.local;
  
  import java.util.concurrent.ConcurrentMap;
  
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.util.internal.ConcurrentHashMap;
  
  /**
   */
  final class LocalChannelRegistry {
  
      private static final ConcurrentMap<LocalAddress, Channel> map =
          new ConcurrentHashMap<LocalAddress, Channel>();
  
      static boolean isRegistered(LocalAddress address) {
          return map.containsKey(address);
      }
  
      static Channel getChannel(LocalAddress address) {
          return map.get(address);
      }
  
      static boolean register(LocalAddress address, Channel channel) {
          return map.putIfAbsent(address, channel) == null;
      }
  
      static boolean unregister(LocalAddress address) {
          return map.remove(address) != null;
      }
  
      private LocalChannelRegistry() {
          // Unused
      }
  }