Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/StaticFLYSArtifact.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 | 04f144c42da5 |
children |
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package de.intevation.flys.artifacts; import java.util.Collection; import java.util.List; import org.apache.log4j.Logger; import org.w3c.dom.Document; import org.w3c.dom.Element; import de.intevation.artifacts.ArtifactNamespaceContext; import de.intevation.artifacts.CallContext; import de.intevation.artifactdatabase.data.StateData; import de.intevation.artifactdatabase.ProtocolUtils; import de.intevation.artifactdatabase.state.Facet; import de.intevation.artifactdatabase.state.Output; import de.intevation.artifactdatabase.state.State; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; /** * A basic FLYSArtifact. */ public abstract class StaticFLYSArtifact extends FLYSArtifact { /** Private logger. */ private static final Logger logger = Logger.getLogger(StaticFLYSArtifact.class); /** Path to 'ids' (data) in doc that comes from datacage. */ public static final String XPATH_IDS = "/art:action/art:ids/@value"; /** * Create description document which includes outputmodes. * @param data ignored. */ @Override public Document describe(Document data, CallContext cc) { logger.debug("Describe artifact: " + identifier()); Document desc = XMLUtils.newDocument(); ElementCreator creator = new ElementCreator( desc, ArtifactNamespaceContext.NAMESPACE_URI, ArtifactNamespaceContext.NAMESPACE_PREFIX); Element root = ProtocolUtils.createRootNode(creator); desc.appendChild(root); Element name = ProtocolUtils.createArtNode( creator, "name", new String[] { "value" }, new String[] { getName() }); root.appendChild(name); ProtocolUtils.appendDescribeHeader(creator, root, identifier(), hash()); root.appendChild(createOutputModes(cc, desc, creator)); // Add the data to an anonymous state. Collection<StateData> datas = getAllData(); if (datas.size() > 0) { Element ui = creator.create("ui"); Element staticE = creator.create("static"); Element state = creator.create("state"); ui.appendChild(staticE); staticE.appendChild(state); root.appendChild(ui); for (StateData dataItem : datas) { Element itemelent = creator.create("data"); creator.addAttr(itemelent, "name", dataItem.getName(), true); creator.addAttr(itemelent, "type", dataItem.getType(), true); state.appendChild(itemelent); Element valuement = creator.create("item"); creator.addAttr(valuement, "label", dataItem.getDescription(), true); creator.addAttr(valuement, "value", dataItem.getValue().toString(), true); itemelent.appendChild(valuement); } } return desc; } /** * Return the value of id element in Datacage data document. * @param data Document as passed by datacage. * @return the id element value of data document. */ public static String getDatacageIDValue(Document data) { return XMLUtils.xpathString(data, XPATH_IDS, ArtifactNamespaceContext.INSTANCE); } protected Element createOutputModes( CallContext cc, Document doc, ElementCreator creator) { logger.debug("createOutputModes"); Element outs = ProtocolUtils.createArtNode( creator, "outputmodes", null, null); State state = getCurrentState(cc); logger.debug("Current state is " + state.getID()); List<Output> list = state.getOutputs(); if (list != null && list.size() > 0) { List<Facet> fs = getFacets(state.getID()); if (fs != null && fs.size() > 0) { List<Output> generated = generateOutputs(list, fs); logger.debug("Found " + fs.size() + " current facets."); if (!generated.isEmpty()) { ProtocolUtils.appendOutputModes( doc, outs, generated); } } else { logger.debug("No facets found for the current state."); } } return outs; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :