Classes in this File | Line Coverage | Branch Coverage | Complexity | |||||||
UuidGenerator |
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| 1.0;1 |
1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more |
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3 | * contributor license agreements. See the NOTICE file distributed with |
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4 | * this work for additional information regarding copyright ownership. |
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0 |
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6 | * (the "License"); you may not use this file except in compliance with |
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7 | * the License. You may obtain a copy of the License at |
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8 | * |
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9 | * http://www.apache.org/licenses/LICENSE-2.0 |
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10 | * |
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11 | * Unless required by applicable law or agreed to in writing, software |
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12 | * distributed under the License is distributed on an "AS IS" BASIS, |
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 | * See the License for the specific language governing permissions and |
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15 | * limitations under the License. |
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16 | */ |
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17 | package org.apache.camel.util; |
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18 | ||
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 | 3 | 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 | 3 | String stub = ""; |
39 | 3 | boolean canAccessSystemProps = true; |
40 | try { |
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41 | 3 | SecurityManager sm = System.getSecurityManager(); |
42 | 3 | if (sm != null) { |
43 | 0 | sm.checkPropertiesAccess(); |
44 | } |
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45 | 0 | } catch (SecurityException se) { |
46 | 0 | canAccessSystemProps = false; |
47 | 3 | } |
48 | ||
49 | 3 | if (canAccessSystemProps) { |
50 | try { |
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51 | 3 | hostName = InetAddress.getLocalHost().getHostName(); |
52 | 3 | ServerSocket ss = new ServerSocket(0); |
53 | 3 | stub = "/" + ss.getLocalPort() + "-" + System.currentTimeMillis() + "/"; |
54 | 3 | Thread.sleep(100); |
55 | 3 | ss.close(); |
56 | 0 | } catch (Exception ioe) { |
57 | 0 | LOG.log(Level.WARNING, "could not generate unique stub", ioe); |
58 | 3 | } |
59 | 0 | } else { |
60 | 0 | hostName = "localhost"; |
61 | 0 | stub = "-1-" + System.currentTimeMillis() + "-"; |
62 | } |
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63 | 3 | UNIQUE_STUB = stub; |
64 | 3 | } |
65 | ||
66 | /** |
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67 | * Construct an IdGenerator |
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68 | * |
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69 | */ |
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70 | ||
71 | 6 | public UuidGenerator(String prefix) { |
72 | 6 | synchronized (UNIQUE_STUB) { |
73 | 6 | this.seed = prefix + UNIQUE_STUB + (instanceCount++) + "-"; |
74 | 6 | } |
75 | 6 | } |
76 | ||
77 | public UuidGenerator() { |
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78 | 6 | this("ID-" + hostName); |
79 | 6 | } |
80 | ||
81 | /** |
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82 | * As we have to find the hostname as a side-affect of generating a unique |
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83 | * stub, we allow it's easy retrevial here |
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84 | * |
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85 | * @return the local host name |
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86 | */ |
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87 | ||
88 | public static String getHostName() { |
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89 | 0 | return hostName; |
90 | } |
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91 | ||
92 | /** |
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93 | * Generate a unqiue id |
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94 | * |
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95 | * @return a unique id |
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96 | */ |
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97 | ||
98 | public synchronized String generateId() { |
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99 | 2361 | return this.seed + (this.sequence++); |
100 | } |
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101 | ||
102 | /** |
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103 | * Generate a unique ID - that is friendly for a URL or file system |
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104 | * |
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105 | * @return a unique id |
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106 | */ |
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107 | public String generateSanitizedId() { |
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108 | 0 | String result = generateId(); |
109 | 0 | result = result.replace(':', '-'); |
110 | 0 | result = result.replace('_', '-'); |
111 | 0 | result = result.replace('.', '-'); |
112 | 0 | return result; |
113 | } |
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114 | ||
115 | } |