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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 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 org.jboss.netty.handler.codec.spdy;

import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.jboss.netty.handler.codec.http.HttpMessage;
import org.jboss.netty.handler.codec.http.HttpResponse;

import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

/**
 * {@link SimpleChannelHandler} that takes care of adding the right streamId to the
 * {@link HttpResponse} if one is not present. This makes it possible to just re-use plan handlers current used
 * for HTTP.
 */
public class SpdyHttpResponseStreamIdHandler extends SimpleChannelHandler {
    private static final Integer NO_ID = -1;
    private final Queue ids = new ConcurrentLinkedQueue();

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        if (e.getMessage() instanceof HttpMessage) {
            boolean contains = ((HttpMessage) e.getMessage()).headers().contains(SpdyHttpHeaders.Names.STREAM_ID);
            if (!contains) {
                ids.add(NO_ID);
            } else {
                ids.add(SpdyHttpHeaders.getStreamId((HttpMessage) e.getMessage()));
            }
        } else if (e.getMessage() instanceof SpdyRstStreamFrame) {
            // remove id from the queue
            ids.remove(((SpdyRstStreamFrame) e.getMessage()).getStreamId());
        }
        super.messageReceived(ctx, e);
    }

    @Override
    public void writeRequested(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        if (e.getMessage() instanceof HttpResponse) {
            HttpResponse response = (HttpResponse) e.getMessage();
            Integer id = ids.poll();
            if (id != null && id.intValue() != NO_ID && !response.headers().contains(SpdyHttpHeaders.Names.STREAM_ID)) {
                SpdyHttpHeaders.setStreamId(response, id);
            }
        }
        super.writeRequested(ctx, e);
    }

}