Source Code : Thread-safe version of the Axiom UUIDGenerator

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Thread-safe version of the Axiom UUIDGenerator

    
/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF 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.
 */

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Random;

/**
 * This is a thread-safe version of the Axiom UUIDGenerator
 * to be used until it is fixed in the next Axiom release
 */
public class UUIDGenerator {
    /** This class will give UUIDs for axis2. */

    private static String baseUUID = null;
    private static long incrementingValue = 0;

    private static Random myRand = null;
    private static boolean useNano = false;

    /**
     * MD5 a random string with localhost/date etc will return 128 bits construct a string of 18
     * characters from those bits.
     *
     * @return string
     */
    public static String getUUID() {
        if (baseUUID == null) {
            baseUUID = getInitialUUID();
            baseUUID = "urn:uuid:" + baseUUID;
        }
        if (++incrementingValue >= Long.MAX_VALUE) {
            incrementingValue = 0;
        }

        if (useNano) {
            return baseUUID + (System.nanoTime() + incrementingValue) +
                Integer.toString(myRand.nextInt());
        } else {

            return baseUUID + (System.currentTimeMillis() + incrementingValue +
                Integer.toString(myRand.nextInt()));
        }

    }

    protected static String getInitialUUID() {

        try {
            if (System.class.getMethod("nanoTime", new Class[0]) != null) {
                useNano = true;
            }
        } catch (NoSuchMethodException ignore) {}

        if (myRand == null) {
            myRand = new Random();
        }
        long rand = myRand.nextLong();
        String sid;
        try {
            sid = InetAddress.getLocalHost().toString();
        } catch (UnknownHostException e) {
            sid = Thread.currentThread().getName();
        }
        StringBuffer sb = new StringBuffer();
        sb.append(sid);
        sb.append(":");
        sb.append(Long.toString(rand));
        MessageDigest md5 = null;
        try {
            md5 = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            //System.out.println("Error: " + e);
            //todo heve to be properly handle
        }
        md5.update(sb.toString().getBytes());
        byte[] array = md5.digest();
        StringBuffer sb2 = new StringBuffer();
        for (int j = 0; j < array.length; ++j) {
            int b = array[j] & 0xFF;
            sb2.append(Integer.toHexString(b));
        }
        int begin = myRand.nextInt();
        if (begin < 0) begin = begin * -1;
        begin = begin % 8;
        return sb2.toString().substring(begin, begin + 18).toUpperCase();
    }
}

   
    
    
    
  

Thank with us