66 lines
2.4 KiB
Java
66 lines
2.4 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.codec.spdy;
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import java.util.LinkedList;
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import java.util.Queue;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.MessageToMessageCodec;
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import io.netty.handler.codec.http.HttpMessage;
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import io.netty.handler.codec.http.HttpResponse;
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/**
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* {@link MessageToMessageCodec} that takes care of adding the right {@link SpdyHttpHeaders#Names#STREAM_ID} to the
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* {@link HttpResponse} if one is not present. This makes it possible to just re-use plan handlers current used
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* for HTTP.
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*/
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public class SpdyHttpResponseStreamIdHandler extends
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MessageToMessageCodec<Object, Object, HttpMessage, HttpMessage> {
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private static final Integer NO_ID = -1;
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private final Queue<Integer> ids = new LinkedList<Integer>();
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public SpdyHttpResponseStreamIdHandler() {
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super(new Class<?>[] { HttpMessage.class, SpdyRstStreamFrame.class }, new Class<?>[] { HttpMessage.class });
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}
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@Override
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public HttpMessage encode(ChannelHandlerContext ctx, HttpMessage msg) throws Exception {
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Integer id = ids.poll();
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if (id != null && id != NO_ID && !msg.containsHeader(SpdyHttpHeaders.Names.STREAM_ID)) {
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SpdyHttpHeaders.setStreamId(msg, id);
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}
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return msg;
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}
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@Override
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public Object decode(ChannelHandlerContext ctx, Object msg) throws Exception {
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if (msg instanceof HttpMessage) {
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boolean contains = ((HttpMessage) msg).containsHeader(SpdyHttpHeaders.Names.STREAM_ID);
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if (!contains) {
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ids.add(NO_ID);
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} else {
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ids.add(SpdyHttpHeaders.getStreamId((HttpMessage) msg));
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}
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} else if (msg instanceof SpdyRstStreamFrame) {
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ids.remove(((SpdyRstStreamFrame) msg).getStreamId());
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}
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return msg;
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}
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}
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