| /* |
| * Copyright 2004,2005 The Apache Software Foundation. |
| * |
| * 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.apache.axis2.util; |
| |
| import java.net.InetAddress; |
| import java.net.UnknownHostException; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.Date; |
| import java.util.Random; |
| |
| 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; |
| |
| /** |
| * 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; |
| } |
| return baseUUID + (System.currentTimeMillis() + incrementingValue); |
| } |
| |
| protected static String getInitialUUID() { |
| 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(); |
| } |
| |
| public static void main(String[] args) { |
| long startTime = new Date().getTime(); |
| for (int i = 0; i < 100000; i++) { |
| UUIDGenerator.getInitialUUID(); |
| } |
| long endTime = new Date().getTime(); |
| System.out.println("getInitialUUID Difference = " + (endTime - startTime)); |
| |
| startTime = new Date().getTime(); |
| for (int i = 0; i < 100000; i++) { |
| UUIDGenerator.getUUID(); |
| } |
| endTime = new Date().getTime(); |
| System.out.println("getUUID Difference = " + (endTime - startTime)); |
| } |
| } |