/*
 Licensed to Diennea S.r.l. under one
 or more contributor license agreements. See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership. Diennea S.r.l. 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 herddb.network.netty;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.UnknownHostException;

/**
 * Network utility
 *
 * @author enrico.olivelli
 */
public class NetworkUtils {

    private static final boolean ENABLE_EPOOL_NATIVE = System.getProperty("os.name").equalsIgnoreCase("linux")
        && !Boolean.getBoolean("herddb.network.disablenativeepoll");

    public static boolean isEnableEpoolNative() {
        return ENABLE_EPOOL_NATIVE;
    }

    public static String getAddress(InetSocketAddress address) {
        if (address.getAddress() != null) {
            return address.getAddress().getHostAddress();
        } else {
            return address.getHostName();
        }
    }

    public static int assignFirstFreePort() throws IOException {
        try (
            ServerSocket socket = new ServerSocket(0);) {
            return socket.getLocalPort();

        }
    }

    public static String getLocalNetworkAddress() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostName();
    }
}

/*
 Licensed to Diennea S.r.l. under one
 or more contributor license agreements. See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership. Diennea S.r.l. 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 herddb.network.netty;

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.UnknownHostException;

import io.netty.channel.epoll.Epoll;

/**
 * Network utility
 *
 * @author enrico.olivelli
 */
public class NetworkUtils {

    private static final boolean ENABLE_EPOOL_NATIVE =
            System.getProperty("os.name").equalsIgnoreCase("linux")
            && !Boolean.getBoolean("herddb.network.disablenativeepoll")
            && Epoll.isAvailable();

    public static boolean isEnableEpoolNative() {
        return ENABLE_EPOOL_NATIVE;
    }

    public static String getAddress(InetSocketAddress address) {
        if (address.getAddress() != null) {
            return address.getAddress().getHostAddress();
        } else {
            return address.getHostName();
        }
    }

    public static int assignFirstFreePort() throws IOException {
        try (
            ServerSocket socket = new ServerSocket(0);) {
            return socket.getLocalPort();

        }
    }

    public static String getLocalNetworkAddress() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostName();
    }
}

Check if epoll is really available #158