KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > cayenne > instrument > InstrumentUtil


1 /*****************************************************************
2  * Licensed to the Apache Software Foundation (ASF) under one
3  * or more contributor license agreements. See the NOTICE file
4  * distributed with this work for additional information
5  * regarding copyright ownership. The ASF licenses this file
6  * to you under the Apache License, Version 2.0 (the
7  * "License"); you may not use this file except in compliance
8  * with the License. You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing,
13  * software distributed under the License is distributed on an
14  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15  * KIND, either express or implied. See the License for the
16  * specific language governing permissions and limitations
17  * under the License.
18  ****************************************************************/
19 package org.apache.cayenne.instrument;
20
21 import java.lang.instrument.Instrumentation JavaDoc;
22
23 /**
24  * Instrumentation utilities.
25  *
26  * @since 3.0
27  * @author Andrus Adamchik
28  */
29 public class InstrumentUtil {
30
31     /**
32      * A property specifying the name of the instrumentation factory that is used to
33      * access JVM {@link Instrumentation} instance.
34      */
35     public static final String JavaDoc INSTRUMENTATION_FACTORY_PROPERTY = "org.apache.cayenne.instrument.factory";
36
37     /**
38      * Returns JVM instrumentation obtained via a preconfigured factory or from a number
39      * of "standard" places known to Cayenne.
40      */
41     public static Instrumentation JavaDoc getInstrumentation() {
42
43         InstrumentationFactory factory;
44
45         String JavaDoc factoryName = System.getProperty(INSTRUMENTATION_FACTORY_PROPERTY);
46         if (factoryName != null) {
47             try {
48                 factory = (InstrumentationFactory) Class.forName(
49                         factoryName,
50                         true,
51                         Thread.currentThread().getContextClassLoader()).newInstance();
52             }
53             catch (Throwable JavaDoc th) {
54                 throw new IllegalStateException JavaDoc("Invalid instrumentation factory: "
55                         + factoryName, th);
56             }
57         }
58         else {
59             factory = new CayenneInstrumentationFactory();
60         }
61
62         return factory.getInstrumentation();
63     }
64 }
65
Popular Tags