1 /*
2 * Copyright 2022 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.netty5.channel.kqueue;
17
18 import io.netty5.channel.DefaultMaxMessagesRecvBufferAllocator;
19
20 /**
21 * {@link DefaultMaxMessagesRecvBufferAllocator} which always try to allocate buffers as big as kqueue tells us
22 * in terms of pending bytes to read.
23 */
24 public final class KQueueGuessRecvBufferAllocator extends DefaultMaxMessagesRecvBufferAllocator {
25 @Override
26 public Handle newHandle() {
27 return new MaxMessageHandle() {
28
29 @Override
30 public int guess() {
31 // attemptedBytesRead(...) is called with what KQueue tells us.
32 int guess = attemptedBytesRead();
33 if (guess == 0) {
34 // Just in case attemptedBytesRead() returns 0 let us allocate something small.
35 return 512;
36 }
37 return guess;
38 }
39 };
40 }
41 }