9ed41db1d7
Motivation These implementations delegate most of their methods to an existing Handle and previously extended RecvByteBufAllocator.DelegatingHandle. This was reverted in #6322 with the introduction of ExtendedHandle but it's not clear to me why it needed to be - the code looks a lot cleaner. Modifications Have (Epoll|KQueue)RecvByteAllocatorHandle extend DelegatingHandle again, while still implementing ExtendedHandle. Result Less code.
113 lines
4.1 KiB
Java
113 lines
4.1 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.channel.kqueue;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufAllocator;
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import io.netty.channel.ChannelConfig;
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import io.netty.channel.RecvByteBufAllocator.DelegatingHandle;
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import io.netty.channel.RecvByteBufAllocator.ExtendedHandle;
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import io.netty.channel.unix.PreferredDirectByteBufAllocator;
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import io.netty.util.UncheckedBooleanSupplier;
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import static java.lang.Math.max;
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import static java.lang.Math.min;
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final class KQueueRecvByteAllocatorHandle extends DelegatingHandle implements ExtendedHandle {
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private final PreferredDirectByteBufAllocator preferredDirectByteBufAllocator =
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new PreferredDirectByteBufAllocator();
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private final UncheckedBooleanSupplier defaultMaybeMoreDataSupplier = new UncheckedBooleanSupplier() {
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@Override
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public boolean get() {
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return maybeMoreDataToRead();
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}
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};
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private boolean overrideGuess;
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private boolean readEOF;
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private long numberBytesPending;
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KQueueRecvByteAllocatorHandle(ExtendedHandle handle) {
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super(handle);
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}
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@Override
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public int guess() {
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return overrideGuess ? guess0() : delegate().guess();
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}
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@Override
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public void reset(ChannelConfig config) {
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overrideGuess = ((KQueueChannelConfig) config).getRcvAllocTransportProvidesGuess();
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delegate().reset(config);
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}
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@Override
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public ByteBuf allocate(ByteBufAllocator alloc) {
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// We need to ensure we always allocate a direct ByteBuf as we can only use a direct buffer to read via JNI.
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preferredDirectByteBufAllocator.updateAllocator(alloc);
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return overrideGuess ? preferredDirectByteBufAllocator.ioBuffer(guess0()) :
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delegate().allocate(preferredDirectByteBufAllocator);
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}
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@Override
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public void lastBytesRead(int bytes) {
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numberBytesPending = bytes < 0 ? 0 : max(0, numberBytesPending - bytes);
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delegate().lastBytesRead(bytes);
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}
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@Override
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public boolean continueReading(UncheckedBooleanSupplier maybeMoreDataSupplier) {
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return ((ExtendedHandle) delegate()).continueReading(maybeMoreDataSupplier);
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}
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@Override
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public boolean continueReading() {
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// We must override the supplier which determines if there maybe more data to read.
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return continueReading(defaultMaybeMoreDataSupplier);
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}
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void readEOF() {
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readEOF = true;
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}
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boolean isReadEOF() {
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return readEOF;
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}
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void numberBytesPending(long numberBytesPending) {
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this.numberBytesPending = numberBytesPending;
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}
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boolean maybeMoreDataToRead() {
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/**
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* kqueue with EV_CLEAR flag set requires that we read until we consume "data" bytes
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* (see <a href="https://www.freebsd.org/cgi/man.cgi?kqueue">kqueue man</a>). However in order to
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* respect auto read we supporting reading to stop if auto read is off. If auto read is on we force reading to
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* continue to avoid a {@link StackOverflowError} between channelReadComplete and reading from the
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* channel. It is expected that the {@link #KQueueSocketChannel} implementations will track if all data was not
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* read, and will force a EVFILT_READ ready event.
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*
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* It is assumed EOF is handled externally by checking {@link #isReadEOF()}.
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*/
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return numberBytesPending != 0;
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}
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private int guess0() {
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return (int) min(numberBytesPending, Integer.MAX_VALUE);
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}
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}
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