* Allow to use native transports when sun.misc.Unsafe is not present on the system Motivation: We should be able to use the native transports (epoll / kqueue) even when sun.misc.Unsafe is not present on the system. This is especially important as Java11 will be released soon and does not allow access to it by default. Modifications: - Correctly disable usage of sun.misc.Unsafe when -PnoUnsafe is used while running the build - Correctly increment metric when UnpooledDirectByteBuf is allocated. This was uncovered once -PnoUnsafe usage was fixed. - Implement fallbacks in all our native transport code for when sun.misc.Unsafe is not present. Result: Fixes https://github.com/netty/netty/issues/8229.
131 lines
4.3 KiB
Java
131 lines
4.3 KiB
Java
/*
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* Copyright 2015 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.epoll;
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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;
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import io.netty.channel.unix.PreferredDirectByteBufAllocator;
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import io.netty.util.UncheckedBooleanSupplier;
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import io.netty.util.internal.ObjectUtil;
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class EpollRecvByteAllocatorHandle implements RecvByteBufAllocator.ExtendedHandle {
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private final PreferredDirectByteBufAllocator preferredDirectByteBufAllocator =
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new PreferredDirectByteBufAllocator();
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private final RecvByteBufAllocator.ExtendedHandle delegate;
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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 isEdgeTriggered;
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private boolean receivedRdHup;
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EpollRecvByteAllocatorHandle(RecvByteBufAllocator.ExtendedHandle handle) {
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delegate = ObjectUtil.checkNotNull(handle, "handle");
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}
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final void receivedRdHup() {
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receivedRdHup = true;
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}
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final boolean isReceivedRdHup() {
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return receivedRdHup;
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}
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boolean maybeMoreDataToRead() {
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/**
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* EPOLL ET requires that we read until we get an EAGAIN
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* (see Q9 in <a href="http://man7.org/linux/man-pages/man7/epoll.7.html">epoll man</a>). However in order to
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* respect auto read we supporting reading to stop if auto read is off. It is expected that the
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* {@link #EpollSocketChannel} implementations will track if we are in edgeTriggered mode and all data was not
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* read, and will force a EPOLLIN ready event.
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*
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* It is assumed RDHUP is handled externally by checking {@link #isReceivedRdHup()}.
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*/
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return (isEdgeTriggered && lastBytesRead() > 0) ||
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(!isEdgeTriggered && lastBytesRead() == attemptedBytesRead());
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}
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final void edgeTriggered(boolean edgeTriggered) {
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isEdgeTriggered = edgeTriggered;
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}
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final boolean isEdgeTriggered() {
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return isEdgeTriggered;
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}
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@Override
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public final 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 delegate.allocate(preferredDirectByteBufAllocator);
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}
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@Override
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public final int guess() {
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return delegate.guess();
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}
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@Override
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public final void reset(ChannelConfig config) {
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delegate.reset(config);
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}
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@Override
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public final void incMessagesRead(int numMessages) {
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delegate.incMessagesRead(numMessages);
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}
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@Override
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public final void lastBytesRead(int bytes) {
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delegate.lastBytesRead(bytes);
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}
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@Override
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public final int lastBytesRead() {
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return delegate.lastBytesRead();
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}
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@Override
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public final int attemptedBytesRead() {
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return delegate.attemptedBytesRead();
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}
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@Override
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public final void attemptedBytesRead(int bytes) {
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delegate.attemptedBytesRead(bytes);
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}
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@Override
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public final void readComplete() {
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delegate.readComplete();
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}
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@Override
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public final boolean continueReading(UncheckedBooleanSupplier maybeMoreDataSupplier) {
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return delegate.continueReading(maybeMoreDataSupplier);
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}
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@Override
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public final 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 delegate.continueReading(defaultMaybeMoreDataSupplier);
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}
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}
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