1 /*
2 * Copyright 2014 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.example.spdy.client;
17
18 import io.netty.channel.ChannelHandlerContext;
19 import io.netty.channel.ChannelOutboundHandlerAdapter;
20 import io.netty.channel.ChannelPromise;
21 import io.netty.handler.codec.http.HttpMessage;
22 import io.netty.handler.codec.spdy.SpdyHttpHeaders;
23
24 /**
25 * Adds a unique client stream ID to the SPDY header. Client stream IDs MUST be odd.
26 */
27 public class SpdyClientStreamIdHandler extends ChannelOutboundHandlerAdapter {
28
29 private int currentStreamId = 1;
30
31 public boolean acceptOutboundMessage(Object msg) {
32 return msg instanceof HttpMessage;
33 }
34
35 @Override
36 public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
37 if (acceptOutboundMessage(msg)) {
38 HttpMessage httpMsg = (HttpMessage) msg;
39 if (!httpMsg.headers().contains(SpdyHttpHeaders.Names.STREAM_ID)) {
40 SpdyHttpHeaders.setStreamId(httpMsg, currentStreamId);
41 // Client stream IDs are always odd
42 currentStreamId += 2;
43 }
44 }
45 ctx.write(msg, promise);
46 }
47 }