/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.geoserver.wcs.response;

import java.io.File;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.geoserver.platform.GeoServerExtensions;
import org.geoserver.platform.GeoServerResourceLoader;
import org.geoserver.platform.resource.Resource;
import org.geoserver.platform.resource.Resource.Type;
import org.geotools.util.logging.Logging;

/**
 * Cleans up the contents of ${GEOSERVER_DATA_DIR}/temp/wcs, by removing all files that
 * have been in the temp folder for too long
 * @author Andrea Aime - TOPP
 *
 */
public class WCSStorageCleaner extends TimerTask {
    Logger LOGGER = Logging.getLogger(WCSStorageCleaner.class);

    long expirationDelay;

    @Override
    public void run() {
        try {
            // first check that temp/wcs is really there in the data dir
            GeoServerResourceLoader loader = GeoServerExtensions.bean(GeoServerResourceLoader.class);
            Resource wcs = loader.get("temp/wcs");
                       
            if( wcs.getType() != Type.DIRECTORY ){
                return; // nothing to cleanup
            }
            
            // ok, now scan for existing files there and clean up those that are too old
            long now = System.currentTimeMillis();
            for(Resource f : wcs.list()) {
                if(now - f.lastmodified() > (expirationDelay * 1000)){
                    f.delete();
                }
            }
        } catch (Exception e) {
            LOGGER.log(Level.WARNING, "Error occurred while trying to clean up "
                    + "old coverages from temp storage", e);
        }
    }

    /**
     * The file expiration delay in seconds, a file will be deleted when
     * it's been around more than expirationDelay
     * 
     *
     */
    public long getExpirationDelay() {
        return expirationDelay;
    }

    public void setExpirationDelay(long expirationDelay) {
        this.expirationDelay = expirationDelay;
    }

}