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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.channel.local;
17  
18  import io.netty.channel.Channel;
19  import io.netty.channel.ChannelException;
20  import io.netty.util.internal.PlatformDependent;
21  import io.netty.util.internal.StringUtil;
22  
23  import java.net.SocketAddress;
24  import java.util.concurrent.ConcurrentMap;
25  
26  final class LocalChannelRegistry {
27  
28      private static final ConcurrentMap<LocalAddress, Channel> boundChannels = PlatformDependent.newConcurrentHashMap();
29  
30      static LocalAddress register(
31              Channel channel, LocalAddress oldLocalAddress, SocketAddress localAddress) {
32          if (oldLocalAddress != null) {
33              throw new ChannelException("already bound");
34          }
35          if (!(localAddress instanceof LocalAddress)) {
36              throw new ChannelException("unsupported address type: " + StringUtil.simpleClassName(localAddress));
37          }
38  
39          LocalAddress addr = (LocalAddress) localAddress;
40          if (LocalAddress.ANY.equals(addr)) {
41              addr = new LocalAddress(channel);
42          }
43  
44          Channel boundChannel = boundChannels.putIfAbsent(addr, channel);
45          if (boundChannel != null) {
46              throw new ChannelException("address already in use by: " + boundChannel);
47          }
48          return addr;
49      }
50  
51      static Channel get(SocketAddress localAddress) {
52          return boundChannels.get(localAddress);
53      }
54  
55      static void unregister(LocalAddress localAddress) {
56          boundChannels.remove(localAddress);
57      }
58  
59      private LocalChannelRegistry() {
60          // Unused
61      }
62  }