Classes in this File | Line Coverage | Branch Coverage | Complexity | |||||||
UuidGenerator |
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| 1.0;1 |
1 | /** |
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2 | * |
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3 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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4 | * contributor license agreements. See the NOTICE file distributed with |
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5 | * this work for additional information regarding copyright ownership. |
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6 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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7 | * (the "License"); you may not use this file except in compliance with |
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8 | * the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | package org.apache.camel.util; |
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19 | import java.net.InetAddress; |
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20 | import java.net.ServerSocket; |
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21 | import java.util.logging.Level; |
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22 | import java.util.logging.Logger; |
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23 | ||
24 | /** |
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25 | * Generator for Globally unique Strings. |
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26 | */ |
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27 | ||
28 | public class UuidGenerator { |
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29 | ||
30 | 1 | private static final Logger log = Logger.getLogger(UuidGenerator.class.getName()); |
31 | private static final String UNIQUE_STUB; |
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32 | private static int instanceCount; |
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33 | private static String hostName; |
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34 | private String seed; |
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35 | private long sequence; |
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36 | ||
37 | static { |
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38 | 1 | String stub = ""; |
39 | 1 | boolean canAccessSystemProps = true; |
40 | try{ |
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41 | 1 | SecurityManager sm = System.getSecurityManager(); |
42 | 1 | if(sm != null){ |
43 | 0 | sm.checkPropertiesAccess(); |
44 | } |
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45 | 0 | }catch(SecurityException se){ |
46 | 0 | canAccessSystemProps = false; |
47 | 1 | } |
48 | ||
49 | 1 | if ( canAccessSystemProps) { |
50 | try { |
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51 | 1 | hostName = InetAddress.getLocalHost().getHostName(); |
52 | 1 | ServerSocket ss = new ServerSocket(0); |
53 | 1 | stub="/" + ss.getLocalPort() + "-" + System.currentTimeMillis() + "/"; |
54 | 1 | Thread.sleep(100); |
55 | 1 | ss.close(); |
56 | 0 | }catch(Exception ioe){ |
57 | 0 | log.log(Level.WARNING, "could not generate unique stub",ioe); |
58 | 1 | } |
59 | 0 | }else{ |
60 | 0 | hostName="localhost"; |
61 | 0 | stub = "-1-" +System.currentTimeMillis() +"-"; |
62 | } |
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63 | 1 | UNIQUE_STUB = stub; |
64 | 1 | } |
65 | ||
66 | /** |
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67 | * As we have to find the hostname as a side-affect of generating |
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68 | * a unique stub, we allow it's easy retrevial here |
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69 | * @return the local host name |
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70 | */ |
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71 | ||
72 | public static String getHostName(){ |
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73 | 0 | return hostName; |
74 | } |
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75 | ||
76 | /** |
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77 | * Construct an IdGenerator |
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78 | * |
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79 | */ |
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80 | ||
81 | 2 | public UuidGenerator(String prefix){ |
82 | 2 | synchronized(UNIQUE_STUB){ |
83 | 2 | this.seed = prefix + UNIQUE_STUB +(instanceCount++) +"-"; |
84 | 2 | } |
85 | 2 | } |
86 | ||
87 | public UuidGenerator(){ |
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88 | 2 | this("ID-" + hostName); |
89 | 2 | } |
90 | ||
91 | /** |
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92 | * Generate a unqiue id |
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93 | * @return a unique id |
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94 | */ |
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95 | ||
96 | public synchronized String generateId(){ |
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97 | 1604 | return this.seed + (this.sequence++); |
98 | } |
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99 | ||
100 | /** |
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101 | * Generate a unique ID - that is friendly for a URL or file system |
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102 | * @return a unique id |
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103 | */ |
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104 | public String generateSanitizedId(){ |
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105 | 0 | String result = generateId(); |
106 | 0 | result = result.replace(':', '-'); |
107 | 0 | result = result.replace('_', '-'); |
108 | 0 | result = result.replace('.', '-'); |
109 | 0 | return result; |
110 | } |
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111 | ||
112 | } |