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There is a newer version: 6.0.2
/**
 * This file is part of Graylog.
 *
 * Graylog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Graylog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Graylog.  If not, see .
 */
package org.graylog2.inputs.transports;

import com.github.joschi.jadconfig.Parameter;
import com.github.joschi.jadconfig.validators.PositiveIntegerValidator;
import com.github.joschi.jadconfig.validators.StringNotBlankValidator;
import com.google.common.annotations.VisibleForTesting;
import io.netty.channel.epoll.Epoll;
import io.netty.channel.kqueue.KQueue;
import io.netty.handler.ssl.OpenSsl;
import io.netty.handler.ssl.SslProvider;
import org.graylog2.inputs.transports.netty.NettyTransportType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Locale;

public class NettyTransportConfiguration {
    private static final Logger LOG = LoggerFactory.getLogger(NettyTransportConfiguration.class);
    private static final String PREFIX = "transport_netty_";

    @Parameter(value = PREFIX + "type", required = true, validators = StringNotBlankValidator.class)
    private String type = "auto";

    @Parameter(value = PREFIX + "tls_provider", required = true, validators = StringNotBlankValidator.class)
    private String tlsProvider = "auto";

    @Parameter(value = PREFIX + "num_threads", required = true, validators = PositiveIntegerValidator.class)
    private int numThreads = Runtime.getRuntime().availableProcessors() * 2;

    public NettyTransportConfiguration() {
    }

    @VisibleForTesting
    public NettyTransportConfiguration(String type, String tlsProvider, int numThreads) {
        this.type = type;
        this.tlsProvider = tlsProvider;
        this.numThreads = numThreads;
    }

    public NettyTransportType getType() {
        switch (type.toLowerCase(Locale.ROOT)) {
            case "epoll":
                return NettyTransportType.EPOLL;
            case "kqueue":
                return NettyTransportType.KQUEUE;
            case "nio":
                return NettyTransportType.NIO;
            case "auto":
            default:
                return detectPlatform();
        }
    }

    private NettyTransportType detectPlatform() {
        if (Epoll.isAvailable()) {
            LOG.debug("Using epoll for Netty transport.");
            return NettyTransportType.EPOLL;
        } else if (KQueue.isAvailable()) {
            LOG.debug("Using kqueue for Netty transport.");
            return NettyTransportType.KQUEUE;
        } else {
            LOG.debug("Using NIO for Netty transport.");
            return NettyTransportType.NIO;
        }
    }

    public SslProvider getTlsProvider() {
        switch (tlsProvider.toLowerCase(Locale.ROOT)) {
            case "openssl":
                return SslProvider.OPENSSL;
            case "jdk":
                return SslProvider.JDK;
            case "auto":
            default:
                return detectTlsProvider();
        }
    }

    private SslProvider detectTlsProvider() {
        if (OpenSsl.isAvailable()) {
            LOG.debug("Using OpenSSL for Netty transports.");
            return SslProvider.OPENSSL;
        } else {
            LOG.debug("Using default Java TLS provider for Netty transports.");
            return SslProvider.JDK;
        }
    }

    public int getNumThreads() {
        return numThreads;
    }
}