001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.db.timing;
029
030import java.lang.reflect.InvocationHandler;
031import java.lang.reflect.InvocationTargetException;
032import java.lang.reflect.Method;
033
034/**
035 * Invocation handler used to measure method calls durations.<p>
036 */
037public class CmsProfilingInvocationHandler implements InvocationHandler {
038
039    /** The profiling handler to which we send the data. */
040    private I_CmsProfilingHandler m_profilingHandler;
041
042    /** The target object which we are proxying. */
043    private Object m_target;
044
045    /**
046     * Creates a new handler instance.<p>
047     *
048     * @param target the object we are proxying
049     * @param timingConsumer the handler to which we send the measured data
050     */
051    public CmsProfilingInvocationHandler(Object target, I_CmsProfilingHandler timingConsumer) {
052
053        m_target = target;
054        m_profilingHandler = timingConsumer;
055    }
056
057    /**
058     * @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object, java.lang.reflect.Method, java.lang.Object[])
059     */
060    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
061
062        long start = 0;
063        long end = 0;
064        try {
065            start = System.nanoTime();
066            return method.invoke(m_target, args);
067        } catch (InvocationTargetException e) {
068            Throwable cause = e.getCause();
069            if (cause != null) {
070                throw cause;
071            } else {
072                throw new RuntimeException(e);
073            }
074        } catch (Throwable e) {
075            throw e;
076        } finally {
077            end = System.nanoTime();
078            long nanos = end - start;
079            String key = method.toString();
080            m_profilingHandler.putTime(key, nanos);
081        }
082    }
083
084}