view artifacts/src/main/java/org/dive4elements/river/artifacts/model/minfo/BedOverviewFactory.java @ 6152:0587819960c3

Waterlevel differences & bed height differences: Add new model LinearInterpolated intented to unify the two very similiar calculations. The focus of the current implementation is correctness and not speed! The fact that the data sets more mostly sorted by station is not exploited. Doing so would improve performance significantly.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 02 Jun 2013 17:52:53 +0200
parents af13ceeba52a
children 9530a00056dd
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/* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU AGPL (>=v3)
 * and comes with ABSOLUTELY NO WARRANTY! Check out the
 * documentation coming with Dive4Elements River for details.
 */

package org.dive4elements.river.artifacts.model.minfo;

import net.sf.ehcache.Cache;
import net.sf.ehcache.Element;

import org.apache.log4j.Logger;
import org.hibernate.Session;

import org.dive4elements.river.artifacts.cache.CacheFactory;
import org.dive4elements.river.backend.SedDBSessionHolder;

public class BedOverviewFactory {

    private static Logger log = Logger.getLogger(BedOverviewFactory.class);

    public static final String CACHE_NAME = "sq-overviews";

    private BedOverviewFactory() {
    }


    public static BedOverview getOverview(String river) {

        boolean debug = log.isDebugEnabled();

        if (debug) {
            log.debug(
                "Looking for bed overview for river '" + river + "'");
        }

        Cache cache = CacheFactory.getCache(CACHE_NAME);

        if (cache == null) {
            if (debug) {
                log.debug("Cache not configured.");
            }
            return getUncached(river);
        }

        String key = "bed-over-" + river;

        Element element = cache.get(key);

        if (element != null) {
            if (debug) {
                log.debug("Overview found in cache");
            }
            return (BedOverview)element.getValue();
        }

        BedOverview overview = getUncached(river);

        if (overview != null) {
            if (debug) {
                log.debug("Store overview in cache.");
            }
            cache.put(new Element(key, overview));
        }

        return overview;
    }

    public static BedOverview getUncached(String river) {
        BedOverview overview = new BedOverview(river);

        Session session = SedDBSessionHolder.HOLDER.get();

        return overview.load(session) ? overview : null;
    }
}

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