/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.example.spdy.client;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.HttpMessage;
import io.netty.handler.codec.spdy.SpdyHttpHeaders;
import io.netty.handler.codec.spdy.SpdyHttpHeaders.Names;
/**
* Adds a unique client stream ID to the SPDY header. Client stream IDs MUST be odd.
*/
public class SpdyClientStreamIdHandler extends ChannelHandlerAdapter {
private int currentStreamId = 1;
public boolean acceptOutboundMessage(Object msg) {
return msg instanceof HttpMessage;
}
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
if (acceptOutboundMessage(msg)) {
HttpMessage httpMsg = (HttpMessage) msg;
if (!httpMsg.headers().contains(SpdyHttpHeaders.Names.STREAM_ID)) {
httpMsg.headers().setInt(Names.STREAM_ID, currentStreamId);
// Client stream IDs are always odd
currentStreamId += 2;
}
}
ctx.write(msg, promise);
}
}