1 /*
2 * Copyright 2020 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.handler.codec.quic;
17
18 /**
19 * Generates and hands over the next stream id to use for a QUIC stream.
20 */
21 final class QuicStreamIdGenerator {
22 private long nextBidirectionalStreamId;
23 private long nextUnidirectionalStreamId;
24
25 QuicStreamIdGenerator(boolean server) {
26 // See https://quicwg.org/base-drafts/rfc9000.html#name-stream-types-and-identifier
27 nextBidirectionalStreamId = server ? 1 : 0;
28 nextUnidirectionalStreamId = server ? 3 : 2;
29 }
30
31 long nextStreamId(boolean bidirectional) {
32 if (bidirectional) {
33 long stream = nextBidirectionalStreamId;
34 nextBidirectionalStreamId += 4;
35 return stream;
36 }
37 long stream = nextUnidirectionalStreamId;
38 nextUnidirectionalStreamId += 4;
39 return stream;
40 }
41 }