Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/ChartArtifact.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 | a2735a4bf75e |
children |
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package de.intevation.flys.artifacts; import org.apache.log4j.Logger; import java.util.List; import org.w3c.dom.Document; import org.w3c.dom.Element; import de.intevation.artifacts.Artifact; import de.intevation.artifacts.ArtifactFactory; import de.intevation.artifacts.CallMeta; import de.intevation.artifacts.CallContext; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; import de.intevation.artifactdatabase.ProtocolUtils; import de.intevation.artifactdatabase.state.Facet; import de.intevation.artifactdatabase.state.State; import de.intevation.artifactdatabase.state.StateEngine; import de.intevation.artifactdatabase.state.Output; import de.intevation.flys.utils.FLYSUtils; import de.intevation.flys.artifacts.states.DefaultState; import de.intevation.flys.artifacts.context.FLYSContext; import de.intevation.flys.artifacts.resources.Resources; /** Artifact, open to generate any (?) out. */ public class ChartArtifact extends FLYSArtifact { private static final Logger logger = Logger.getLogger(ChartArtifact.class); @Override public void setup( String identifier, ArtifactFactory factory, Object context, CallMeta callmeta, Document data) { logger.debug("ChartArtifact.setup"); this.identifier = identifier; name = "new_chart"; List<State> states = getStates(context); setCurrentState(states.get(0)); } @Override protected void appendBackgroundActivity( ElementCreator cr, Element root, CallContext context ) { Element inBackground = cr.create("background-processing"); root.appendChild(inBackground); cr.addAttr( inBackground, "value", String.valueOf(context.isInBackground()), true); } /** * Append output mode nodes to a document. */ @Override protected void appendOutputModes( Document doc, Element outs, CallContext context, String uuid) { List<String> stateIds = getPreviousStateIds(); FLYSContext flysContext = FLYSUtils.getFlysContext(context); StateEngine engine = (StateEngine) flysContext.get( FLYSContext.STATE_ENGINE_KEY); for (String stateId: stateIds) { logger.debug("Append output modes for state: " + stateId); DefaultState state = (DefaultState) engine.getState(stateId); List<Output> list = state.getOutputs(); if (list == null || list.isEmpty()) { logger.debug("-> No output modes for this state."); continue; } List<Facet> fs = getFacets(stateId); if (fs == null || fs.isEmpty()) { logger.debug("No facets for previous state found."); continue; } logger.debug("Found " + fs.size() + " facets in previous states."); List<Output> generated = generateOutputs(list, fs); ProtocolUtils.appendOutputModes(doc, outs, generated); } try { DefaultState cur = (DefaultState) getCurrentState(context); List<Output> list = cur.getOutputs(); if (list != null && list.size() > 0) { logger.debug( "Append output modes for current state: " + cur.getID()); List<Facet> fs = getFacets(cur.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."); } } } catch (IllegalArgumentException iae) { // state is not valid, so we do not append its outputs. } } public static class ChartState extends DefaultState { public static final String FIELD_MODE = "chart_type"; public static final String DURATION_CURVE = "chart.new.durationcurve"; public static final String COMPUTED_DISCHARGE_CURVE = "chart.new.computeddischargecurve"; public static final String DISCHARGE_LONGITUDINAL_CURVE = "chart.new.longitudinal_section"; public static final String W_DIFFERENCES = "chart.new.w_differences"; public static final String WATERLEVEL = "chart.new.crosssection"; public static final String[] CHARTS = { COMPUTED_DISCHARGE_CURVE, DURATION_CURVE, DISCHARGE_LONGITUDINAL_CURVE, W_DIFFERENCES, WATERLEVEL }; @Override public Object computeAdvance( FLYSArtifact artifact, String hash, CallContext context, List<Facet> facets, Object old) { logger.debug("ChartState.computeAdvance"); return null; } @Override protected Element[] createItems( XMLUtils.ElementCreator cr, Artifact artifact, String name, CallContext context) { CallMeta meta = context.getMeta(); Element[] charts = new Element[CHARTS.length]; int i = 0; for (String chart: CHARTS) { charts[i++] = createItem( cr, new String[] { Resources.getMsg(meta, chart, chart), chart }); } return charts; } } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :