Motivation The EpollChannelConfig (same for KQueues) and its subclasses repeatetly declare their own channel field which leads to a 3x repetition for each config instance. Given the fields are protected or package-private it's exposing the code code to "field hiding" bugs. Modifications Use the the existing protected channel field from the DefaultChannelConfig class and simply cast it when needed. Result Fixes #8331
191 lines
6.2 KiB
Java
191 lines
6.2 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.ByteBufAllocator;
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import io.netty.channel.ChannelException;
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import io.netty.channel.ChannelOption;
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import io.netty.channel.DefaultChannelConfig;
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import io.netty.channel.MessageSizeEstimator;
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import io.netty.channel.RecvByteBufAllocator;
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import io.netty.channel.WriteBufferWaterMark;
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import java.io.IOException;
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import java.util.Map;
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import static io.netty.channel.unix.Limits.SSIZE_MAX;
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public class EpollChannelConfig extends DefaultChannelConfig {
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private volatile long maxBytesPerGatheringWrite = SSIZE_MAX;
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EpollChannelConfig(AbstractEpollChannel channel) {
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super(channel);
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}
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@Override
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public Map<ChannelOption<?>, Object> getOptions() {
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return getOptions(super.getOptions(), EpollChannelOption.EPOLL_MODE);
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}
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@SuppressWarnings("unchecked")
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@Override
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public <T> T getOption(ChannelOption<T> option) {
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if (option == EpollChannelOption.EPOLL_MODE) {
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return (T) getEpollMode();
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}
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return super.getOption(option);
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}
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@Override
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public <T> boolean setOption(ChannelOption<T> option, T value) {
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validate(option, value);
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if (option == EpollChannelOption.EPOLL_MODE) {
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setEpollMode((EpollMode) value);
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} else {
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return super.setOption(option, value);
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}
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return true;
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}
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@Override
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public EpollChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
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super.setConnectTimeoutMillis(connectTimeoutMillis);
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return this;
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}
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@Override
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@Deprecated
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public EpollChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
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super.setMaxMessagesPerRead(maxMessagesPerRead);
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return this;
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}
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@Override
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public EpollChannelConfig setWriteSpinCount(int writeSpinCount) {
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super.setWriteSpinCount(writeSpinCount);
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return this;
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}
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@Override
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public EpollChannelConfig setAllocator(ByteBufAllocator allocator) {
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super.setAllocator(allocator);
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return this;
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}
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@Override
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public EpollChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
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if (!(allocator.newHandle() instanceof RecvByteBufAllocator.ExtendedHandle)) {
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throw new IllegalArgumentException("allocator.newHandle() must return an object of type: " +
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RecvByteBufAllocator.ExtendedHandle.class);
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}
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super.setRecvByteBufAllocator(allocator);
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return this;
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}
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@Override
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public EpollChannelConfig setAutoRead(boolean autoRead) {
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super.setAutoRead(autoRead);
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return this;
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}
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@Override
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@Deprecated
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public EpollChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
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super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
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return this;
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}
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@Override
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@Deprecated
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public EpollChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
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super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
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return this;
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}
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@Override
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public EpollChannelConfig setWriteBufferWaterMark(WriteBufferWaterMark writeBufferWaterMark) {
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super.setWriteBufferWaterMark(writeBufferWaterMark);
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return this;
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}
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@Override
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public EpollChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
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super.setMessageSizeEstimator(estimator);
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return this;
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}
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/**
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* Return the {@link EpollMode} used. Default is
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* {@link EpollMode#EDGE_TRIGGERED}. If you want to use {@link #isAutoRead()} {@code false} or
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* {@link #getMaxMessagesPerRead()} and have an accurate behaviour you should use
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* {@link EpollMode#LEVEL_TRIGGERED}.
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*/
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public EpollMode getEpollMode() {
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return ((AbstractEpollChannel) channel).isFlagSet(Native.EPOLLET)
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? EpollMode.EDGE_TRIGGERED : EpollMode.LEVEL_TRIGGERED;
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}
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/**
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* Set the {@link EpollMode} used. Default is
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* {@link EpollMode#EDGE_TRIGGERED}. If you want to use {@link #isAutoRead()} {@code false} or
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* {@link #getMaxMessagesPerRead()} and have an accurate behaviour you should use
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* {@link EpollMode#LEVEL_TRIGGERED}.
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*
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* <strong>Be aware this config setting can only be adjusted before the channel was registered.</strong>
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*/
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public EpollChannelConfig setEpollMode(EpollMode mode) {
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if (mode == null) {
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throw new NullPointerException("mode");
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}
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try {
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switch (mode) {
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case EDGE_TRIGGERED:
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checkChannelNotRegistered();
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((AbstractEpollChannel) channel).setFlag(Native.EPOLLET);
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break;
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case LEVEL_TRIGGERED:
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checkChannelNotRegistered();
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((AbstractEpollChannel) channel).clearFlag(Native.EPOLLET);
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break;
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default:
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throw new Error();
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}
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} catch (IOException e) {
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throw new ChannelException(e);
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}
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return this;
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}
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private void checkChannelNotRegistered() {
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if (channel.isRegistered()) {
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throw new IllegalStateException("EpollMode can only be changed before channel is registered");
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}
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}
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@Override
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protected final void autoReadCleared() {
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((AbstractEpollChannel) channel).clearEpollIn();
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}
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final void setMaxBytesPerGatheringWrite(long maxBytesPerGatheringWrite) {
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this.maxBytesPerGatheringWrite = maxBytesPerGatheringWrite;
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}
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final long getMaxBytesPerGatheringWrite() {
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return maxBytesPerGatheringWrite;
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}
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}
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