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Java > Open Source Codes > org > apache > juddi > uuidgen > UUIDGenFactory


1 /*
2  * Copyright 2001-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.juddi.uuidgen;
17
18 import org.apache.commons.logging.Log;
19 import org.apache.commons.logging.LogFactory;
20 import org.apache.juddi.util.Config;
21 import org.apache.juddi.util.Loader;
22
23 /**
24  * Used to create the org.apache.juddi.uuidgen.UUIDGen implementation
25  * as specified by the 'juddi.uuidgen.impl' property. Defaults to
26  * org.apache.juddi.uuidgen.SecureUUIDGen if an implementation is not
27  * specified.
28  *
29  * @author Steve Viens (sviens@apache.org)
30  */
31 public abstract class UUIDGenFactory
32 {
33   // private reference to the jUDDI logger
34 private static Log log = LogFactory.getLog(UUIDGenFactory.class);
35
36   // UUIDGen property key & default implementation
37 private static final String JavaDoc IMPL_KEY = "juddi.uuidgen";
38   private static final String JavaDoc DEFAULT_IMPL = "org.apache.juddi.uuidgen.DefaultUUIDGen";
39
40   // the shared UUIDGen instance
41 private static UUIDGen uuidgen = null;
42
43   /**
44    * Returns a new instance of a UUIDGenFactory.
45    *
46    * @return UUIDGen
47    */
48   public static UUIDGen getUUIDGen()
49   {
50     if (uuidgen == null)
51       uuidgen = createUUIDGen();
52     return uuidgen;
53   }
54
55   /**
56    * Returns a new instance of a UUIDGen.
57    *
58    * @return UUIDGen
59    */
60   private static synchronized UUIDGen createUUIDGen()
61   {
62     if (uuidgen != null)
63       return uuidgen;
64
65     // grab class name of the UUIDGen implementation to create
66 String JavaDoc className = Config.getStringProperty(IMPL_KEY,DEFAULT_IMPL);
67
68     // write the UUIDGen implementation name to the log
69 log.debug("UUIDGen Implementation = " + className);
70
71     Class JavaDoc uuidgenClass = null;
72     try
73     {
74       // Use Loader to locate & load the UUIDGen implementation
75 uuidgenClass = Loader.getClassForName(className);
76     }
77     catch(ClassNotFoundException JavaDoc e)
78     {
79       log.error("The specified UUIDGen class '" + className +
80         "' was not found in classpath.");
81       log.error(e);
82     }
83
84     try
85     {
86       // try to instantiate the UUIDGen implementation
87 uuidgen = (UUIDGen)uuidgenClass.newInstance();
88     }
89     catch(Exception JavaDoc e)
90     {
91       log.error("Exception while attempting to instantiate the " +
92         "implementation of UUIDGen: " + uuidgenClass.getName() +
93         "\n" + e.getMessage());
94       log.error(e);
95     }
96
97     return uuidgen;
98   }
99
100
101   /***************************************************************************/
102   /***************************** TEST DRIVER *********************************/
103   /***************************************************************************/
104
105
106   public static void main(String JavaDoc[] args)
107   {
108     // number of UUID's to generate
109 final int max = 100;
110
111     try
112     {
113       UUIDGen uuidgen = UUIDGenFactory.getUUIDGen();
114
115       for (int i=0; i<max; ++i)
116         System.out.println( i + ": " + uuidgen.uuidgen());
117     }
118     catch (Exception JavaDoc ex) { ex.printStackTrace(); }
119   }
120 }
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