001    //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/framework/util/ProfilerInterceptor.java $
002    // $Id: ProfilerInterceptor.java 18195 2009-06-18 15:55:39Z mschneider $
003    /*----------------------------------------------------------------------------
004     This file is part of deegree, http://deegree.org/
005     Copyright (C) 2001-2009 by:
006       Department of Geography, University of Bonn
007     and
008       lat/lon GmbH
009    
010     This library is free software; you can redistribute it and/or modify it under
011     the terms of the GNU Lesser General Public License as published by the Free
012     Software Foundation; either version 2.1 of the License, or (at your option)
013     any later version.
014     This library is distributed in the hope that it will be useful, but WITHOUT
015     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
016     FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
017     details.
018     You should have received a copy of the GNU Lesser General Public License
019     along with this library; if not, write to the Free Software Foundation, Inc.,
020     59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
021    
022     Contact information:
023    
024     lat/lon GmbH
025     Aennchenstr. 19, 53177 Bonn
026     Germany
027     http://lat-lon.de/
028    
029     Department of Geography, University of Bonn
030     Prof. Dr. Klaus Greve
031     Postfach 1147, 53001 Bonn
032     Germany
033     http://www.geographie.uni-bonn.de/deegree/
034    
035     e-mail: info@deegree.org
036    ----------------------------------------------------------------------------*/
037    
038    package org.deegree.framework.util;
039    
040    import java.lang.reflect.InvocationTargetException;
041    import java.lang.reflect.Method;
042    import java.text.DecimalFormat;
043    import java.text.NumberFormat;
044    import java.util.HashMap;
045    
046    /**
047     * Interceptor to profile the application.
048     *
049     * @author <a href="mailto:tfr@users.sourceforge.net">Torsten Friebe </A>
050     *
051     * @author last edited by: $Author: mschneider $
052     *
053     * @version 2.0, $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
054     *
055     * @see <a href="http://www.dofactory.com/patterns/PatternChain.aspx">Chain of Responsibility Design Pattern </a>
056     *
057     * @since 2.0
058     */
059    public class ProfilerInterceptor extends Interceptor {
060    
061        static {
062            Runtime.getRuntime().addShutdownHook( new Thread( new Runnable() {
063    
064                public void run() {
065                    printStats();
066                }
067            } ) );
068        }
069    
070        /**
071         * data to be used
072         */
073        protected static HashMap<String, ProfileEntry> data = new HashMap<String, ProfileEntry>();
074    
075        /**
076         *
077         * @param nextInterceptor
078         */
079        public ProfilerInterceptor( Interceptor nextInterceptor ) {
080            this.nextInterceptor = nextInterceptor;
081        }
082    
083        /**
084         *
085         *
086         */
087        protected static void printStats() {
088            NumberFormat zweiDezimalen = new DecimalFormat( "### ###.##" );
089    
090            for ( String m : data.keySet() ) {
091                ProfileEntry entry = data.get( m );
092                LOG.logInfo( entry.invocations + " calls " + entry.time + " ms " + " avg "
093                             + zweiDezimalen.format( entry.getAverage() ) + m );
094            }
095        }
096    
097        /**
098         *
099         * @param m
100         * @return named ProfileEntry
101         */
102        protected static ProfileEntry getEntry( String m ) {
103            if ( data.containsKey( m ) ) {
104                return data.get( m );
105            }
106            ProfileEntry entry = new ProfileEntry();
107            data.put( m, entry );
108            return entry;
109        }
110    
111        /**
112         * @param method
113         * @param params
114         * @return -
115         */
116        @Override
117        protected Object handleInvocation( Method method, Object[] params )
118                                throws IllegalAccessException, InvocationTargetException {
119            long start = System.currentTimeMillis();
120            Object result = nextInterceptor.handleInvocation( method, params );
121            long duration = System.currentTimeMillis() - start;
122            ProfileEntry entry = getEntry( getTarget().getClass().getName() + "." + method.getName() );
123            entry.time += duration;
124            entry.invocations++;
125            return result;
126        }
127    
128        /**
129         * <code>ProfileEntry</code> simple wrapper to be used ad a profile entry
130         *
131         * @author last edited by: $Author: mschneider $
132         *
133         * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
134         */
135        static class ProfileEntry {
136    
137            /**
138             * of the profile entry
139             */
140            long time;
141    
142            /**
143             * how many invocations
144             */
145            long invocations;
146    
147            /**
148             * @return the average invocations during the last time
149             */
150            public double getAverage() {
151                return (double) time / invocations;
152            }
153    
154        }
155    }