Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/CollectionMonitor.java @ 5779:ebec12def170
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 | a929d9a9fa1e |
children |
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package de.intevation.flys.artifacts; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.xml.xpath.XPathConstants; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import de.intevation.artifacts.Artifact; import de.intevation.artifacts.ArtifactNamespaceContext; import de.intevation.artifacts.CallContext; import de.intevation.artifacts.Hook; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; import de.intevation.artifactdatabase.state.Output; import de.intevation.flys.artifacts.datacage.Recommendations; /** Monitors collection changes. */ public class CollectionMonitor implements Hook { public static final String XPATH_RESULT = "/art:result"; @Override public void setup(Node cfg) { } @Override public void execute(Artifact artifact, CallContext context, Document doc) { FLYSArtifact flys = (FLYSArtifact) artifact; Element result = (Element) XMLUtils.xpath( doc, XPATH_RESULT, XPathConstants.NODE, ArtifactNamespaceContext.INSTANCE); ElementCreator creator = new ElementCreator( doc, ArtifactNamespaceContext.NAMESPACE_URI, ArtifactNamespaceContext.NAMESPACE_PREFIX); Element recommended = creator.create("recommended-artifacts"); result.appendChild(recommended); String[] outs = extractOutputNames(flys, context); Map<String, Object> params = getNoneUserSpecificParameters(flys, context); Recommendations rec = Recommendations.getInstance(); // TODO For newer official-lines recommendations we actually // need user-id (null here). rec.recommend(flys, null, outs, params, recommended); } /** * Get outputnames from current state (only the ones for which * facets exist). */ public static String[] extractOutputNames( FLYSArtifact flys, CallContext context) { if (flys instanceof ChartArtifact) { return new String[0]; } List<Output> outs = flys.getCurrentOutputs(context); int num = outs == null ? 0 : outs.size(); String[] names = new String[num]; for (int i = 0; i < num; i++) { names[i] = outs.get(i).getName(); } return names; } /** * Creates Map from Strings "recommended" to "true". */ protected Map<String, Object> getNoneUserSpecificParameters( FLYSArtifact flys, CallContext context) { Map<String, Object> params = new HashMap<String, Object>(1); params.put("recommended", "true"); return params; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :