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Java example source code file (EpollChannelConfig.java)

This example Java source code file (EpollChannelConfig.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractepollchannel, defaultchannelconfig, deprecated, edge_triggered, epollchannelconfig, epollmode, ioexception, level_triggered, map, nullpointerexception, object, override, suppresswarnings, util

The EpollChannelConfig.java Java example source code

/*
 * Copyright 2015 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.channel.epoll;

import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelException;
import io.netty.channel.ChannelOption;
import io.netty.channel.DefaultChannelConfig;
import io.netty.channel.MessageSizeEstimator;
import io.netty.channel.RecvByteBufAllocator;
import io.netty.channel.WriteBufferWaterMark;

import java.io.IOException;
import java.util.Map;

public class EpollChannelConfig extends DefaultChannelConfig {
    final AbstractEpollChannel channel;

    EpollChannelConfig(AbstractEpollChannel channel) {
        super(channel);
        this.channel = channel;
    }

    @Override
    public Map<ChannelOption getOptions() {
        return getOptions(super.getOptions(), EpollChannelOption.EPOLL_MODE);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T getOption(ChannelOption option) {
        if (option == EpollChannelOption.EPOLL_MODE) {
            return (T) getEpollMode();
        }
        return super.getOption(option);
    }

    @Override
    public <T> boolean setOption(ChannelOption option, T value) {
        validate(option, value);
        if (option == EpollChannelOption.EPOLL_MODE) {
            setEpollMode((EpollMode) value);
        } else {
            return super.setOption(option, value);
        }
        return true;
    }

    @Override
    public EpollChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis) {
        super.setConnectTimeoutMillis(connectTimeoutMillis);
        return this;
    }

    @Override
    @Deprecated
    public EpollChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead) {
        super.setMaxMessagesPerRead(maxMessagesPerRead);
        return this;
    }

    @Override
    public EpollChannelConfig setWriteSpinCount(int writeSpinCount) {
        super.setWriteSpinCount(writeSpinCount);
        return this;
    }

    @Override
    public EpollChannelConfig setAllocator(ByteBufAllocator allocator) {
        super.setAllocator(allocator);
        return this;
    }

    @Override
    public EpollChannelConfig setRecvByteBufAllocator(RecvByteBufAllocator allocator) {
        super.setRecvByteBufAllocator(allocator);
        return this;
    }

    @Override
    public EpollChannelConfig setAutoRead(boolean autoRead) {
        super.setAutoRead(autoRead);
        return this;
    }

    @Override
    @Deprecated
    public EpollChannelConfig setWriteBufferHighWaterMark(int writeBufferHighWaterMark) {
        super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
        return this;
    }

    @Override
    @Deprecated
    public EpollChannelConfig setWriteBufferLowWaterMark(int writeBufferLowWaterMark) {
        super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
        return this;
    }

    @Override
    public EpollChannelConfig setWriteBufferWaterMark(WriteBufferWaterMark writeBufferWaterMark) {
        super.setWriteBufferWaterMark(writeBufferWaterMark);
        return this;
    }

    @Override
    public EpollChannelConfig setMessageSizeEstimator(MessageSizeEstimator estimator) {
        super.setMessageSizeEstimator(estimator);
        return this;
    }

    /**
     * Return the {@link EpollMode} used. Default is
     * {@link EpollMode#EDGE_TRIGGERED}. If you want to use {@link #isAutoRead()} {@code false} or
     * {@link #getMaxMessagesPerRead()} and have an accurate behaviour you should use
     * {@link EpollMode#LEVEL_TRIGGERED}.
     */
    public EpollMode getEpollMode() {
        return channel.isFlagSet(Native.EPOLLET)
                ? EpollMode.EDGE_TRIGGERED : EpollMode.LEVEL_TRIGGERED;
    }

    /**
     * Set the {@link EpollMode} used. Default is
     * {@link EpollMode#EDGE_TRIGGERED}. If you want to use {@link #isAutoRead()} {@code false} or
     * {@link #getMaxMessagesPerRead()} and have an accurate behaviour you should use
     * {@link EpollMode#LEVEL_TRIGGERED}.
     *
     * <strong>Be aware this config setting can only be adjusted before the channel was registered.
     */
    public EpollChannelConfig setEpollMode(EpollMode mode) {
        if (mode == null) {
            throw new NullPointerException("mode");
        }
        try {
            switch (mode) {
            case EDGE_TRIGGERED:
                checkChannelNotRegistered();
                channel.setFlag(Native.EPOLLET);
                break;
            case LEVEL_TRIGGERED:
                checkChannelNotRegistered();
                channel.clearFlag(Native.EPOLLET);
                break;
            default:
                throw new Error();
            }
        } catch (IOException e) {
            throw new ChannelException(e);
        }
        return this;
    }

    private void checkChannelNotRegistered() {
        if (channel.isRegistered()) {
            throw new IllegalStateException("EpollMode can only be changed before channel is registered");
        }
    }

    @Override
    protected final void autoReadCleared() {
        channel.clearEpollIn();
    }
}

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