/*
* 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 com.facebook.presto.jdbc.internal.netty.handler.codec.spdy;
import com.facebook.presto.jdbc.internal.netty.channel.ChannelHandlerContext;
import com.facebook.presto.jdbc.internal.netty.channel.MessageEvent;
import com.facebook.presto.jdbc.internal.netty.channel.SimpleChannelHandler;
import com.facebook.presto.jdbc.internal.netty.handler.codec.http.HttpMessage;
import com.facebook.presto.jdbc.internal.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<Integer> ids = new ConcurrentLinkedQueue<Integer>();
@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
if (e.getMessage() instanceof HttpMessage) {
boolean contains = ((HttpMessage) e.getMessage()).containsHeader(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.containsHeader(SpdyHttpHeaders.Names.STREAM_ID)) {
SpdyHttpHeaders.setStreamId(response, id);
}
}
super.writeRequested(ctx, e);
}
}