Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/artifacts/services/GaugeInfoService.java @ 7471:fff862f4ef76
Experimental caching of datacage recommendations. The respective hook is called a lot and running the datacage over and over again when loading data can be expensive. So the generated recommendations are cached for some time.
Hopefully this improves the overall speed of loading data from the datacage.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Wed, 30 Oct 2013 15:26:21 +0100 |
parents | af13ceeba52a |
children | e4606eae8ea5 |
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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.services; import java.util.ArrayList; import java.util.List; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.apache.log4j.Logger; import org.dive4elements.artifacts.common.ArtifactNamespaceContext; import org.dive4elements.artifacts.common.utils.XMLUtils; import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator; import org.dive4elements.artifacts.CallMeta; import org.dive4elements.artifacts.GlobalContext; import org.dive4elements.river.model.Gauge; import org.dive4elements.river.model.Range; import org.dive4elements.river.model.River; import org.dive4elements.river.artifacts.model.RiverFactory; /** * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class GaugeInfoService extends D4EService { interface Filter { boolean apply(Gauge gauge); } private static final class ReferenceNumberFilter implements Filter { private long refNr; public ReferenceNumberFilter(long refNr) { this.refNr = refNr; } @Override public boolean apply(Gauge gauge) { if (logger.isDebugEnabled()) { logger.debug("Test gauge '" + gauge.getName() + "'"); } return gauge != null && gauge.getOfficialNumber() == refNr; } } // end of ReferenceNumberFilter class /** The logger that is used by this service.*/ private static Logger logger = Logger.getLogger(GaugeInfoService.class); public static final String XPATH_RIVERNAME = "/art:river/@name"; public static final String XPATH_REFERENCE_NR = "/art:river/art:filter/art:gauge/text()"; public GaugeInfoService() { } @Override public Document doProcess( Document data, GlobalContext context, CallMeta callMeta ) { logger.debug("GaugeInfoService.process"); if (logger.isDebugEnabled()) { logger.debug(XMLUtils.toString(data)); } River river = getRiverFromRequest(data); List<Filter> filters = getFilters(data); List<Gauge> allGauges = river.getGauges(); List<Gauge> filtered = new ArrayList<Gauge>(); for (Gauge g: allGauges) { for (Filter f: filters) { if (f.apply(g)) { filtered.add(g); break; } } } return buildInfoDocument(filtered); } protected River getRiverFromRequest(Document data) { String rivername = XMLUtils.xpathString( data, XPATH_RIVERNAME, ArtifactNamespaceContext.INSTANCE); logger.debug("Return Gauge info for River '" + rivername + "'"); return rivername != null ? RiverFactory.getRiver(rivername) : null; } protected List<Filter> getFilters(Document data) { List<Filter> filters = new ArrayList<Filter>(); String refNr = XMLUtils.xpathString( data, XPATH_REFERENCE_NR, ArtifactNamespaceContext.INSTANCE); if (refNr != null && refNr.length() > 0) { try { filters.add( new ReferenceNumberFilter(Long.parseLong(refNr))); } catch (NumberFormatException nfe) { logger.warn(nfe, nfe); } } return filters; } protected Document buildInfoDocument(List<Gauge> gauges) { Document doc = XMLUtils.newDocument(); ElementCreator cr = new ElementCreator( doc, ArtifactNamespaceContext.NAMESPACE_URI, ArtifactNamespaceContext.NAMESPACE_PREFIX); Element service = cr.create("service"); logger.debug("Append " + gauges.size() + " gauges to info doc."); for (Gauge g: gauges) { Range r = g.getRange(); Element el = cr.create("gauge"); cr.addAttr(el, "name", g.getName()); cr.addAttr(el, "lower", String.valueOf(r.getA().doubleValue())); cr.addAttr(el, "upper", String.valueOf(r.getB().doubleValue())); service.appendChild(el); } doc.appendChild(service); return doc; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :