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;
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 private static final ChannelMetadata METADATA = new ChannelMetadata(false, 16);
33
34 /**
35 * Creates a new instance.
36 */
37 protected AbstractServerChannel() {
38 super(null);
39 }
40
41 @Override
42 public ChannelMetadata metadata() {
43 return METADATA;
44 }
45
46 @Override
47 public SocketAddress remoteAddress() {
48 return null;
49 }
50
51 @Override
52 protected SocketAddress remoteAddress0() {
53 return null;
54 }
55
56 @Override
57 protected void doDisconnect() throws Exception {
58 throw new UnsupportedOperationException();
59 }
60
61 @Override
62 protected AbstractUnsafe newUnsafe() {
63 return new DefaultServerUnsafe();
64 }
65
66 @Override
67 protected void doWrite(ChannelOutboundBuffer in) throws Exception {
68 throw new UnsupportedOperationException();
69 }
70
71 @Override
72 protected final Object filterOutboundMessage(Object msg) {
73 throw new UnsupportedOperationException();
74 }
75
76 private final class DefaultServerUnsafe extends AbstractUnsafe {
77 @Override
78 public void connect(SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
79 safeSetFailure(promise, new UnsupportedOperationException());
80 }
81 }
82 }