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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    *   http://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;
17  
18  import java.net.SocketAddress;
19  
20  /**
21   * A skeletal server-side {@link Channel} implementation.  A server-side
22   * {@link Channel} does not allow the following operations:
23   * <ul>
24   * <li>{@link #connect(SocketAddress, ChannelPromise)}</li>
25   * <li>{@link #disconnect(ChannelPromise)}</li>
26   * <li>{@link #write(Object, ChannelPromise)}</li>
27   * <li>{@link #flush()}</li>
28   * <li>and the shortcut methods which calls the methods mentioned above
29   * </ul>
30   */
31  public abstract class AbstractServerChannel extends AbstractChannel implements ServerChannel {
32  
33      private static final ChannelMetadata METADATA = new ChannelMetadata(false);
34  
35      /**
36       * Creates a new instance.
37       */
38      protected AbstractServerChannel() {
39          super(null);
40      }
41  
42      @Override
43      public ChannelMetadata metadata() {
44          return METADATA;
45      }
46  
47      @Override
48      public SocketAddress remoteAddress() {
49          return null;
50      }
51  
52      @Override
53      protected SocketAddress remoteAddress0() {
54          return null;
55      }
56  
57      @Override
58      protected void doDisconnect() throws Exception {
59          throw new UnsupportedOperationException();
60      }
61  
62      @Override
63      protected AbstractUnsafe newUnsafe() {
64          return new DefaultServerUnsafe();
65      }
66  
67      @Override
68      protected void doWrite(ChannelOutboundBuffer in) throws Exception {
69          throw new UnsupportedOperationException();
70      }
71  
72      @Override
73      protected final Object filterOutboundMessage(Object msg) {
74          throw new UnsupportedOperationException();
75      }
76  
77      private final class DefaultServerUnsafe extends AbstractUnsafe {
78          @Override
79          public void connect(SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
80              safeSetFailure(promise, new UnsupportedOperationException());
81          }
82      }
83  }