| 1 | /* |
| 2 | * @(#) $Id: PidGenerator.java,v 1.1.1.1 2006/03/19 06:09:42 rossen Exp $ |
| 3 | * |
| 4 | * Copyright (c) 2006, WebHydra.com |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions are met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * * Neither the name of the WebHydra.com nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | package com.webhydra.slug.process; |
| 33 | |
| 34 | import java.util.Date; |
| 35 | |
| 36 | /** |
| 37 | * Unique <code>PID</code> generator. |
| 38 | * @author rossen |
| 39 | */ |
| 40 | public class PidGenerator { |
| 41 | |
| 42 | /** Holds next <code>PID</code> sequence extension value. */ |
| 43 | static protected long nexPidSeq = 0; |
| 44 | |
| 45 | /** Paer separatirs in the generated <code>PID</code>s. |
| 46 | */ |
| 47 | public static final char SEPARATOR = ':'; |
| 48 | |
| 49 | /** Generate next <code>PID</code> |
| 50 | * @return next <code>PID</code> sequence. |
| 51 | */ |
| 52 | private static synchronized long getNextPidExtension() |
| 53 | { |
| 54 | long newPid = nexPidSeq; |
| 55 | nexPidSeq = (nexPidSeq == Long.MAX_VALUE) ? 0 : nexPidSeq + 1; |
| 56 | return newPid; |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Generate new unique <code>PID</code> |
| 61 | * @return new unique <code>PID</code>. |
| 62 | */ |
| 63 | public static String newPid() |
| 64 | { |
| 65 | return Long.toString(new Date().getTime()) + SEPARATOR + getNextPidExtension(); |
| 66 | } |
| 67 | |
| 68 | } |