MeasuringWrapper.java

biz/hammurapi/metrics/MeasuringWrapper.java

Violations

Inspector	Message	Severity	Location
Java Inspector 048	Copyrights information should be present in each file.	1
Java Inspector 089	Constructor is not properly documented	2	45:9
Java Inspector 089	Undocumented parameter consumer	2	45:9
Java Inspector 089	Undocumented method	2	70:41
Java Inspector 026	Avoid hardwired string literals. Allowed literals: []	3	76:107
Java Inspector 051	It is good practice to call in any case super() in a constructor.	3	45:9

Source code

1/*
2  * hgcommons 9
3 * Hammurapi Group Common Library
4 * Copyright (C) 2003  Hammurapi Group
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19 *
20 * URL: http://www.hammurapi.biz/hammurapi-biz/ef/xmenu/hammurapi-group/products/products/hgcommons/index.html
21 * e-Mail: support@hammurapi.biz
22  */
23package biz.hammurapi.metrics;
24
25import java.lang.reflect.InvocationHandler;
26import java.lang.reflect.Method;
27import java.lang.reflect.Proxy;
28
29import biz.hammurapi.wrap.WrapperHandler;
30
31/**
32 * Wraps objects to measure object method's performance.
33 *
34 * @author Pavel Vlasov
35 *
36 * @version $Revision: 1.3 $
37 */
38public class MeasuringWrapper {
39
40	private MeasurementConsumer consumer;
41
42	/**
43	 *
44	 */
45	public MeasuringWrapper(MeasurementConsumer consumer) {
46		this.consumer=consumer;
47	}
48	
49	/**
50	 * Wraps object to measure methods performance.
51	 * @param obj Object to be wrapped.
52	 * @return proxy object which implements all interfaces of the original object.
53	 */
54	public Object wrap(final Object obj) {
55		return wrap(obj, consumer);
56	}
57	
58	/**
59	 * Wraps object to measure methods performance.
60	 * @param obj Object to be wrapped.
61	 * @param consumer Metric consumer.
62	 * @return proxy object which implements all interfaces of the original object.
63	 */
64	public static Object wrap(final Object obj, final MeasurementConsumer consumer) {
65		return Proxy.newProxyInstance(
66				obj.getClass().getClassLoader(),
67				WrapperHandler.getClassInterfaces(obj.getClass()),
68				new InvocationHandler() {
69
70					public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {						
71						long start=System.currentTimeMillis();
72						try {
73							return method.invoke(obj, args);							
74						} finally {
75							long finish=System.currentTimeMillis();
76							consumer.addMeasurement(obj.getClass().toString()+": "+method, finish-start, finish);
77						}
78					}
79					
80				});
81	}
82
83}
84