74f24a5c19
Motivation: Our http2 child channel implementation was not 100 % complete and had a few bugs. Beside this the performance overhead was non-trivial. Modifications: There are a lot of modifications, the most important.... * Http2FrameCodec extends Http2ConnectionHandler and Http2MultiplexCodec extends Http2FrameCodec to reduce performance heads and inter-dependencies on handlers in the pipeline * Correctly handle outbound flow control for child channels * Support unknow frame types in Http2FrameCodec and Http2MultiplexCodec * Use a consistent way how to create Http2ConnectionHandler, Http2FrameCodec and Http2MultiplexCodec (via a builder) * Remove Http2Codec and Http2CodecBuilder as the user should just use Http2MultipleCodec and Http2MultiplexCodecBuilder now * Smart handling of flushes from child channels to reduce overhead * Reduce object allocations * child channels always use the same EventLoop as the parent Channel to reduce overhead and simplify implementation. * Not extend AbstractChannel for the child channel implementation to reduce overhead in terms of performance and memory usage * Remove Http2FrameStream.managedState(...) as the user of the child channel api should just use Channel.attr(...) Result: Http2MultiplexCodec (and so child channels) and Http2FrameCodec are more correct, faster and more feature complete.
202 lines
5.7 KiB
Java
202 lines
5.7 KiB
Java
/*
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* Copyright 2016 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.http2;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.util.IllegalReferenceCountException;
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import io.netty.util.internal.StringUtil;
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import io.netty.util.internal.UnstableApi;
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import static io.netty.handler.codec.http2.Http2CodecUtil.verifyPadding;
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import static io.netty.util.internal.ObjectUtil.checkNotNull;
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/**
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* The default {@link Http2DataFrame} implementation.
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*/
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@UnstableApi
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public final class DefaultHttp2DataFrame extends AbstractHttp2StreamFrame implements Http2DataFrame {
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private final ByteBuf content;
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private final boolean endStream;
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private final int padding;
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private final int initialFlowControlledBytes;
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/**
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* Equivalent to {@code new DefaultHttp2DataFrame(content, false)}.
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*
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* @param content non-{@code null} payload
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*/
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public DefaultHttp2DataFrame(ByteBuf content) {
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this(content, false);
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}
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/**
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* Equivalent to {@code new DefaultHttp2DataFrame(Unpooled.EMPTY_BUFFER, endStream)}.
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*
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* @param endStream whether this data should terminate the stream
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*/
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public DefaultHttp2DataFrame(boolean endStream) {
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this(Unpooled.EMPTY_BUFFER, endStream);
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}
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/**
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* Equivalent to {@code new DefaultHttp2DataFrame(content, endStream, 0)}.
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*
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* @param content non-{@code null} payload
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* @param endStream whether this data should terminate the stream
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*/
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public DefaultHttp2DataFrame(ByteBuf content, boolean endStream) {
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this(content, endStream, 0);
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}
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/**
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* Construct a new data message.
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*
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* @param content non-{@code null} payload
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* @param endStream whether this data should terminate the stream
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* @param padding additional bytes that should be added to obscure the true content size. Must be between 0 and
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* 256 (inclusive).
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*/
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public DefaultHttp2DataFrame(ByteBuf content, boolean endStream, int padding) {
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this.content = checkNotNull(content, "content");
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this.endStream = endStream;
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verifyPadding(padding);
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this.padding = padding;
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if (content().readableBytes() + (long) padding > Integer.MAX_VALUE) {
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throw new IllegalArgumentException("content + padding must be <= Integer.MAX_VALUE");
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}
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initialFlowControlledBytes = content().readableBytes() + padding;
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}
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@Override
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public DefaultHttp2DataFrame stream(Http2FrameStream stream) {
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super.stream(stream);
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return this;
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}
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@Override
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public String name() {
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return "DATA";
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}
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@Override
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public boolean isEndStream() {
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return endStream;
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}
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@Override
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public int padding() {
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return padding;
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}
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@Override
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public ByteBuf content() {
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if (content.refCnt() <= 0) {
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throw new IllegalReferenceCountException(content.refCnt());
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}
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return content;
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}
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@Override
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public int initialFlowControlledBytes() {
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return initialFlowControlledBytes;
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}
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@Override
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public DefaultHttp2DataFrame copy() {
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return replace(content().copy());
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}
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@Override
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public DefaultHttp2DataFrame duplicate() {
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return replace(content().duplicate());
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}
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@Override
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public DefaultHttp2DataFrame retainedDuplicate() {
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return replace(content().retainedDuplicate());
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}
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@Override
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public DefaultHttp2DataFrame replace(ByteBuf content) {
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return new DefaultHttp2DataFrame(content, endStream, padding);
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}
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@Override
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public int refCnt() {
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return content.refCnt();
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}
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@Override
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public boolean release() {
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return content.release();
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}
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@Override
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public boolean release(int decrement) {
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return content.release(decrement);
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}
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@Override
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public DefaultHttp2DataFrame retain() {
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content.retain();
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return this;
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}
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@Override
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public DefaultHttp2DataFrame retain(int increment) {
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content.retain(increment);
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return this;
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}
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@Override
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public String toString() {
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return StringUtil.simpleClassName(this) + "(stream=" + stream() + ", content=" + content
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+ ", endStream=" + endStream + ", padding=" + padding + ')';
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}
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@Override
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public DefaultHttp2DataFrame touch() {
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content.touch();
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return this;
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}
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@Override
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public DefaultHttp2DataFrame touch(Object hint) {
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content.touch(hint);
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return this;
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}
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@Override
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public boolean equals(Object o) {
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if (!(o instanceof DefaultHttp2DataFrame)) {
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return false;
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}
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DefaultHttp2DataFrame other = (DefaultHttp2DataFrame) o;
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return super.equals(other) && content.equals(other.content())
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&& endStream == other.endStream && padding == other.padding;
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}
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@Override
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public int hashCode() {
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int hash = super.hashCode();
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hash = hash * 31 + content.hashCode();
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hash = hash * 31 + (endStream ? 0 : 1);
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hash = hash * 31 + padding;
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return hash;
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}
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}
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