/* * Copyright (c) 2005, John Mettraux, OpenWFE.org * All rights reserved. *  * Redistribution and use in source and binary forms, with or without  * modification, are permitted provided that the following conditions are met: *  * . Redistributions of source code must retain the above copyright notice, this *   list of conditions and the following disclaimer.   *  * . Redistributions in binary form must reproduce the above copyright notice,  *   this list of conditions and the following disclaimer in the documentation  *   and/or other materials provided with the distribution. *  * . Neither the name of the "OpenWFE" nor the names of its contributors may be *   used to endorse or promote products derived from this software without *   specific prior written permission. *  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  * POSSIBILITY OF SUCH DAMAGE. * * $Id: MethodJournal.java,v 1.3 2005/05/17 16:40:14 jmettraux Exp $ *///// MethodJournal.java//// john.mettraux@openwfe.org//// generated with // jtmpl 1.1.01 2004/05/19 (john.mettraux@openwfe.org)//package openwfe.org.misc;import openwfe.org.ReflectionUtils;/** * An instance of this class stores a journal of operation to be performed * at a later point, it borrows the idea of journal of journalled filesystems. * It will be useful for implementing pausing a component : operations called * for a paused component will be stored here and then processed when the * 'play' is hit. * <br><br> * <i>idea for next iteration : It could be used in conjunction with a  * proxy...</i> * * <p><font size=2>CVS Info : * <br>$Author: jmettraux $ * <br>$Id: MethodJournal.java,v 1.3 2005/05/17 16:40:14 jmettraux Exp $ </font> * * @author john.mettraux@openwfe.org */public class MethodJournal{    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger        .getLogger(MethodJournal.class.getName());    //    // CONSTANTS & co    //    // FIELDS    private Object target = null;    private java.util.List journal = new java.util.ArrayList(100);    //    // CONSTRUCTORS    /**     * Creates a new, empty MethodJournal instance for a given target     * object.     */    public MethodJournal (final Object target)    {        this.target = target;    }    //    // METHODS    /**     * Adds an operation to the journal, the operation will only be     * executed when the flush method is called.     */    public void addOperation         (final String methodName,          final Class[] paramTypes,          final Object[] params)    {        synchronized (this.journal)        {            this.journal.add(new Entry(methodName, paramTypes, params));        }    }    /**     * Tells the journal to flush, ie executing all the stored operations     * on its target.     */    public void flush ()    {        final long start = System.currentTimeMillis();        synchronized (this.journal)        {            final java.util.Iterator it = this.journal.iterator();            while (it.hasNext())            {                final Entry e = (Entry)it.next();                try                {                    e.execute(this.target);                }                catch (final Exception ex)                {                    log.warn("flush() method call '"+e+"' failed", ex);                }            }            this.journal.clear();        }        log.debug("flush() took "+(System.currentTimeMillis() - start)+" ms");    }    /**     * Launches the flushing of journallised methods in a dedicated thread     */    public void flushInOwnThread ()    {        (new Thread()         {             public void run ()             {                 MethodJournal.this.flush();             }         }).start();    }    //    // STATIC METHODS    //    // INNER CLASSES    private static class Entry    {        private String methodName = null;        private Class[] paramTypes = null;        private Object[] params = null;        public Entry             (final String methodName,              final Class[] paramTypes,             final Object[] params)        {            this.methodName = methodName;            this.paramTypes = paramTypes;            this.params = params;        }        /*        public String getMethodName () { return this.methodName; }        public Object[] getParams () { return this.params; }        */        public void execute (final Object target)            throws Exception        {            ReflectionUtils.invoke                (target,                 this.methodName,                 this.paramTypes,                 this.params);        }        public String toString ()        {            return this.methodName;        }    }}