SleepyCheckpointerJob.java :  » Image » ochan » org » ochan » job » Java Open Source

/*
Ochan - image board/anonymous forum
Copyright (C) 2010  David Seymore

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.ochan.job;

import java.util.prefs.Preferences;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.ochan.dpl.SleepyEnvironment;
import org.ochan.util.ManagedQuartzJobBean;
import org.quartz.JobExecutionContext;
import org.springframework.context.ApplicationContext;
import org.springframework.jmx.export.annotation.ManagedResource;

import com.sleepycat.je.CheckpointConfig;

/**
 * This class runs the filesystem sync & log checkpoint process of the
 * berkeleydb database.
 * 
 * @author David Seymore Mar 29, 2009
 */
@ManagedResource(description = "Sleepycat Persistence Checkpoint Background Job", objectName = "Ochan:type=job,name=CheckpointJob", logFile = "jmx.log")
public class SleepyCheckpointerJob extends ManagedQuartzJobBean {

  private static final Log LOG = LogFactory.getLog(SleepyCheckpointerJob.class.getName());
  private static Preferences PREFERENCES = Preferences.userNodeForPackage(SleepyCheckpointerJob.class);

  @Override
  public void executeOnSchedule(JobExecutionContext context) {
    try {
      ApplicationContext appCtx = getApplicationContext(context);
      CheckpointConfig checkpointConfig = new CheckpointConfig();
      SleepyEnvironment environment = (SleepyEnvironment) appCtx.getBean("sleepy");
      // checkpoint every 500Kb
      checkpointConfig.setKBytes(500);
      // lets run our cleaner first
      LOG.debug("Running the cleaner.");
      environment.getEnvironment().cleanLog();
      LOG.debug("Running the checkpoint.");
      environment.getEnvironment().checkpoint(checkpointConfig);
      // and lets sync it.. so that we aren't filling up memory forever.
      LOG.debug("Running the sync command.");
      environment.getEnvironment().sync();
    } catch (Exception e) {
      LOG.fatal("Unable to get spring context for services.");
    }
  }

  @Override
  public Preferences getPreferences() {
    return PREFERENCES;
  }

  @Override
  public String getTriggerName() {
    return "checkpointTrigger";
  }
}