org.nustaq.fastcast.util.FCUtils Maven / Gradle / Ivy

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/*
 * Copyright 2014 Ruediger Moeller.
 *
 * Licensed 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 org.nustaq.fastcast.util;

import org.nustaq.fastcast.impl.Packet;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.concurrent.*;

/**
 */
public class FCUtils {

    public static String createNodeId( String addendum ) {
        final String name = addendum + "-" + toUnsignedString((int) (Math.random()*0xfffff), 5);
        if ( name.length() > Packet.MAX_NODE_NAME_LEN)
            throw new RuntimeException("node name '"+name+"' too long. Max length is "+Packet.MAX_NODE_NAME_LEN);
        return name;
    }

    private static String toUnsignedString(int i, int shift) {
        char[] buf = new char[32];
        int charPos = 32;
        int radix = 1 << shift;
        int mask = radix - 1;
        do {
            buf[--charPos] = digits[i & mask];
            i >>>= shift;
        } while (i != 0);

        return new String(buf, charPos, (32 - charPos));
    }

    final static char[] digits = {
            '0' , '1' , '2' , '3' , '4' , '5' ,
            '6' , '7' , '8' , '9' , 'a' , 'b' ,
            'c' , 'd' , 'e' , 'f' , 'g' , 'h' ,
            'i' , 'j' , 'k' , 'l' , 'm' , 'n' ,
            'o' , 'p' , 'q' , 'r' , 's' , 't' ,
            'u' , 'v' , 'w' , 'x' , 'y' , 'z'
    };

    public static boolean isWindows() {
        return System.getProperty("os.name","").indexOf("indows") > 0;
    }
}