84 lines
3.2 KiB
Java
84 lines
3.2 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.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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class EpollRecvByteAllocatorHandle 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 = this::maybeMoreDataToRead;
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private boolean isEdgeTriggered;
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private boolean receivedRdHup;
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EpollRecvByteAllocatorHandle(ExtendedHandle handle) {
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super(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 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 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 continueReading(defaultMaybeMoreDataSupplier);
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}
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}
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