/*
 *  eXist Open Source Native XML Database
 *  Copyright (C) 2001-06 The eXist Project
 *  http://exist-db.org
 *  
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *  
 *  \$Id\$
 */
package org.exist.performance;

import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.exist.EXistException;
import org.exist.Namespaces;
import org.exist.performance.actions.Action;
import org.xmldb.api.base.XMLDBException;

import java.util.List;
import java.util.ArrayList;
import java.util.Iterator;

public class ActionSequence extends AbstractAction {

    protected int repeat = 1;
    protected List actions = new ArrayList();
    protected Runner runner;

    public void configure(Runner runner, Action parent, Element config) throws EXistException {
        super.configure(runner, parent, config);
        this.runner = runner;
        if (config.hasAttribute("repeat")) {
            String repeatParam = config.getAttribute("repeat");
            try {
                repeat = Integer.parseInt(repeatParam);
            } catch (NumberFormatException e) {
                throw new EXistException(getClass().getName() +
                        ": value of attribute repeat should be an integer. found: " + repeatParam);
            }
        }
        NodeList nl = config.getChildNodes();
        for (int i = 0; i < nl.getLength(); i++) {
            Node node = nl.item(i);
            if (node.getNodeType() == Node.ELEMENT_NODE) {
                Element elem = (Element) node;
                if (elem.getNamespaceURI().equals(Namespaces.EXIST_NS)) {
                    Class clazz = runner.getClassForAction(elem.getLocalName());
                    if (clazz == null)
                        throw new EXistException("no class defined for action: " + elem.getLocalName());
                    if (!Action.class.isAssignableFrom(clazz))
                        throw new EXistException("class " + clazz.getName() + " does not implement interface Action");
                    try {
                        Action instance = (Action) clazz.newInstance();
                        instance.configure(runner, this, elem);
                        actions.add(instance);
                    } catch (InstantiationException e) {
                        throw new EXistException("failed to create instance of class " + clazz.getName(), e);
                    } catch (IllegalAccessException e) {
                        throw new EXistException("failed to create instance of class " + clazz.getName(), e);
                    }
                }
            }
        }
    }

    public void execute(Connection connection) throws XMLDBException, EXistException {
        for (int i = 0; i < repeat; i++) {
            for (Iterator iterator = actions.iterator(); iterator.hasNext();) {
                Action action = (Action) iterator.next();
                long start = System.currentTimeMillis();
                LOG.debug('[' + Thread.currentThread().getName() + "] " + action.getClass().getName());
                action.execute(connection);
                long elapsed = System.currentTimeMillis() - start;
                LOG.debug('[' + Thread.currentThread().getName() + "] " + action.getClass().getName() + " took " + elapsed + "ms.");
                runner.getResults().report(action, null, elapsed);
                System.gc();
            }
        }
    }
}