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1
17 package org.apache.servicemix.id;
18
19
22
23
24 import java.net.InetAddress  ;
25 import java.net.ServerSocket ;
26 import java.util.logging.Level ;
27 import java.util.logging.Logger ;
28
29
32
33 public class IdGenerator{
34
35 private static final Logger log = Logger.getLogger(IdGenerator.class.getName());
36 private static final String UNIQUE_STUB;
37 private static int instanceCount;
38 private static String hostName;
39 private String seed;
40 private long sequence;
41
42 static {
43 String stub = "";
44 boolean canAccessSystemProps = true;
45 try{
46 SecurityManager sm = System.getSecurityManager();
47 if(sm != null){
48 sm.checkPropertiesAccess();
49 }
50 }catch(SecurityException se){
51 canAccessSystemProps = false;
52 }
53
54 if ( canAccessSystemProps) {
55 try {
56 hostName = InetAddress.getLocalHost().getHostName();
57 ServerSocket ss = new ServerSocket (0);
58 stub=hostName + "-" + ss.getLocalPort() + "-" + System.currentTimeMillis() + "-";
59 Thread.sleep(100);
60 ss.close();
61 }catch(Exception ioe){
62 log.log(Level.WARNING, "could not generate unique stub",ioe);
63 }
64 }else{
65 hostName="localhost";
66 stub = hostName + "-1-" +System.currentTimeMillis() +"-";
67 }
68 UNIQUE_STUB = stub;
69 }
70
71
76
77 public static String getHostName(){
78 return hostName;
79 }
80
81
85
86 public IdGenerator(String prefix){
87 synchronized(UNIQUE_STUB){
88 this.seed = prefix + UNIQUE_STUB +(instanceCount++) +":";
89 }
90 }
91
92 public IdGenerator(){
93 this("ID:");
94 }
95
96
100
101 public synchronized String generateId(){
102 return this.seed + (this.sequence++);
103 }
104
105
109 public String generateSanitizedId(){
110 String result = generateId();
111 result = result.replace(':', '-');
112 result = result.replace('_', '-');
113 result = result.replace('.', '-');
114 return result;
115 }
116
117 }
118 |
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