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view flys-client/src/main/java/de/intevation/flys/client/server/MapHelper.java @ 5779:ebec12def170

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Datacage: Add a pool of builders to make it multi threadable. XML DOM is not thread safe. Therefore the old implementation only allowed one thread to use the builder at a time. As the complexity of the configuration has increased over time this has become a bottleneck of the whole application because it took quiet some time to build a result. Furthermore the builder code path is visited very frequent. So many concurrent requests were piled up resulting in long waits for the users. To mitigate this problem a round robin pool of builders is used now. Each of the pooled builders has an independent copy of the XML template and can be run in parallel. The number of builders is determined by the system property 'flys.datacage.pool.size'. It defaults to 4.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 21 Apr 2013 12:48:09 +0200
parents e3bd1f412421
children
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package de.intevation.flys.client.server;

import org.w3c.dom.Document;

import org.apache.log4j.Logger;

import de.intevation.artifacts.common.ArtifactNamespaceContext;
import de.intevation.artifacts.common.utils.XMLUtils;

import de.intevation.flys.client.shared.model.MapConfig;


public class MapHelper {

    private static final Logger logger = Logger.getLogger(MapHelper.class);


    public static final String XPATH_SRID =
        "/art:floodmap/art:srid/text()";

    public static final String XPATH_MAX_EXTENT =
        "/art:floodmap/art:maxExtent/text()";

    public static final String XPATH_INITIAL_EXTENT =
        "/art:floodmap/art:initialExtent/text()";


    private MapHelper() {
    }


    public static MapConfig parseConfig(Document raw) {
        logger.debug("MapHelper.parseConfig");

        if (logger.isDebugEnabled()) {
            logger.debug(XMLUtils.toString(raw));
        }

        MapConfig config = new MapConfig();

        setSrid(config, raw);
        setMaxExtent(config, raw);
        setInitialExtent(config, raw);

        return config;
    }


    protected static void setSrid(MapConfig config, Document raw) {
        String srid = (String) XMLUtils.xpathString(
            raw,
            XPATH_SRID,
            ArtifactNamespaceContext.INSTANCE);

        logger.debug("Found srid: '" + srid + "'");

        if (srid != null && srid.length() > 0) {
            logger.debug("Set srid: '" + srid + "'");
            config.setSrid(srid);
        }
    }


    protected static void setMaxExtent(MapConfig config, Document raw) {
        String maxExtent = (String) XMLUtils.xpathString(
            raw,
            XPATH_MAX_EXTENT,
            ArtifactNamespaceContext.INSTANCE);

        logger.debug("Found max extent: '" + maxExtent + "'");

        if (maxExtent != null && maxExtent.length() > 0) {
            logger.debug("Set max extent: '" + maxExtent + "'");
            config.setMaxExtent(maxExtent);
        }
    }


    protected static void setInitialExtent(MapConfig config, Document raw) {
        String initialExtent = (String) XMLUtils.xpathString(
            raw,
            XPATH_INITIAL_EXTENT,
            ArtifactNamespaceContext.INSTANCE);

        if (initialExtent != null && initialExtent.length() > 0) {
            logger.debug("Set initial extent: '" + initialExtent + "'");
            config.setInitialExtent(initialExtent);
        }
    }
}
// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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