1 /*
2 * Copyright 2021 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.kqueue;
17
18 import io.netty.channel.Channel;
19 import io.netty.channel.ChannelMetadata;
20 import io.netty.channel.ChannelOutboundBuffer;
21
22 import java.io.IOException;
23
24 abstract class AbstractKQueueDatagramChannel extends AbstractKQueueChannel {
25
26 private static final ChannelMetadata METADATA = new ChannelMetadata(true, 16);
27
28 AbstractKQueueDatagramChannel(Channel parent, BsdSocket fd, boolean active) {
29 super(parent, fd, active);
30 }
31
32 @Override
33 public ChannelMetadata metadata() {
34 return METADATA;
35 }
36
37 protected abstract boolean doWriteMessage(Object msg) throws Exception;
38
39 @Override
40 protected void doWrite(ChannelOutboundBuffer in) throws Exception {
41 int maxMessagesPerWrite = maxMessagesPerWrite();
42 while (maxMessagesPerWrite > 0) {
43 Object msg = in.current();
44 if (msg == null) {
45 break;
46 }
47
48 try {
49 boolean done = false;
50 for (int i = config().getWriteSpinCount(); i > 0; --i) {
51 if (doWriteMessage(msg)) {
52 done = true;
53 break;
54 }
55 }
56
57 if (done) {
58 in.remove();
59 maxMessagesPerWrite--;
60 } else {
61 break;
62 }
63 } catch (IOException e) {
64 maxMessagesPerWrite--;
65
66 // Continue on write error as a DatagramChannel can write to multiple remote peers
67 //
68 // See https://github.com/netty/netty/issues/2665
69 in.remove(e);
70 }
71 }
72
73 // Whether all messages were written or not.
74 writeFilter(!in.isEmpty());
75 }
76 }