09faa72296
Motivation: Prefer ArrayDeque to LinkedList because latter will produce more GC. Modification: - Replace LinkedList with ArrayDeque Result: Less GC
69 lines
2.6 KiB
Java
69 lines
2.6 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 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.spdy.SpdyHttpHeaders.Names;
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import io.netty.util.ReferenceCountUtil;
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import java.util.ArrayDeque;
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import java.util.List;
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import java.util.Queue;
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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 HttpMessage} 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, HttpMessage> {
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private static final Integer NO_ID = -1;
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private final Queue<Integer> ids = new ArrayDeque<Integer>();
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@Override
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public boolean acceptInboundMessage(Object msg) throws Exception {
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return msg instanceof HttpMessage || msg instanceof SpdyRstStreamFrame;
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}
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@Override
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protected void encode(ChannelHandlerContext ctx, HttpMessage msg, List<Object> out) throws Exception {
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Integer id = ids.poll();
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if (id != null && id.intValue() != NO_ID && !msg.headers().contains(SpdyHttpHeaders.Names.STREAM_ID)) {
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msg.headers().setInt(Names.STREAM_ID, id);
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}
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out.add(ReferenceCountUtil.retain(msg));
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, Object msg, List<Object> out) throws Exception {
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if (msg instanceof HttpMessage) {
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boolean contains = ((HttpMessage) msg).headers().contains(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(((HttpMessage) msg).headers().getInt(Names.STREAM_ID));
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}
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} else if (msg instanceof SpdyRstStreamFrame) {
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ids.remove(((SpdyRstStreamFrame) msg).streamId());
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}
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out.add(ReferenceCountUtil.retain(msg));
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}
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}
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