/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.xwiki.extension.distribution.internal;

import java.util.Arrays;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Named;

import org.xwiki.bridge.event.ActionExecutingEvent;
import org.xwiki.component.annotation.Component;
import org.xwiki.extension.distribution.internal.DistributionManager.DistributionState;
import org.xwiki.observation.EventListener;
import org.xwiki.observation.event.ApplicationStartedEvent;
import org.xwiki.observation.event.Event;

import com.xpn.xwiki.XWikiContext;

/**
 * Initialize farm distribution job.
 * 
 * @version $Id$
 * @since 4.2M3
 */
@Component
@Named("DistributionInitializerListener")
public class DistributionInitializerListener implements EventListener
{
    /**
     * The list of events to listen to.
     */
    private static final List<Event> EVENTS = Arrays.<Event> asList(new ApplicationStartedEvent(),
        new ActionExecutingEvent("view"));

    /**
     * The component used to get information about the current distribution.
     */
    @Inject
    private DistributionManager distributionManager;

    @Override
    public List<Event> getEvents()
    {
        return EVENTS;
    }

    @Override
    public String getName()
    {
        return "DistributionInitializerListener";
    }

    @Override
    public void onEvent(Event event, Object arg1, Object arg2)
    {
        DistributionState distributionState = this.distributionManager.getFarmDistributionState();

        if (distributionState != DistributionState.NONE) {
            if (event instanceof ApplicationStartedEvent) {
                this.distributionManager.startFarmJob();
            } else {
                String wiki = ((XWikiContext) arg2).getDatabase();
                if (this.distributionManager.getWikiJob(wiki) == null) {
                    this.distributionManager.startWikiJob(wiki);
                }
            }
        }
    }
}

/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.xwiki.extension.distribution.internal;

import java.util.Arrays;
import java.util.List;

import javax.inject.Inject;
import javax.inject.Named;

import org.xwiki.bridge.event.ActionExecutingEvent;
import org.xwiki.component.annotation.Component;
import org.xwiki.extension.distribution.internal.DistributionManager.DistributionState;
import org.xwiki.observation.EventListener;
import org.xwiki.observation.event.ApplicationStartedEvent;
import org.xwiki.observation.event.Event;

import com.xpn.xwiki.XWikiContext;

/**
 * Initialize farm distribution job.
 * 
 * @version $Id$
 * @since 4.2M3
 */
@Component
@Named("DistributionInitializerListener")
public class DistributionInitializerListener implements EventListener
{
    /**
     * The list of events to listen to.
     */
    private static final List<Event> EVENTS = Arrays.<Event> asList(new ApplicationStartedEvent(),
        new ActionExecutingEvent("view"));

    /**
     * The component used to get information about the current distribution.
     */
    @Inject
    private DistributionManager distributionManager;

    @Override
    public List<Event> getEvents()
    {
        return EVENTS;
    }

    @Override
    public String getName()
    {
        return "DistributionInitializerListener";
    }

    @Override
    public void onEvent(Event event, Object arg1, Object arg2)
    {
        DistributionState distributionState = this.distributionManager.getFarmDistributionState();

        if (distributionState != DistributionState.NONE) {
            if (event instanceof ApplicationStartedEvent) {
                this.distributionManager.startFarmJob();
            } else {
                startWikiJob(((XWikiContext) arg2).getDatabase());
            }
        }
    }

    /**
     * @param wiki the wiki for which to start the distribution job
     */
    private synchronized void startWikiJob(String wiki)
    {
        if (this.distributionManager.getWikiJob(wiki) == null) {
            this.distributionManager.startWikiJob(wiki);
        }
    }
}

Introduce per wiki distribution status * bulletproofing