Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/ExternalWMSArtifact.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 java.util.ArrayList; import java.util.List; import org.apache.log4j.Logger; import org.w3c.dom.Document; import de.intevation.artifacts.Artifact; import de.intevation.artifacts.ArtifactFactory; import de.intevation.artifacts.CallMeta; import de.intevation.artifactdatabase.state.DefaultOutput; import de.intevation.artifactdatabase.state.Facet; import de.intevation.artifactdatabase.state.State; import de.intevation.flys.artifacts.states.WMSBackgroundState; public class ExternalWMSArtifact extends StaticFLYSArtifact { public static final String NAME = "external_wms"; private static final Logger logger = Logger.getLogger(ExternalWMSArtifact.class); @Override public String getName() { return NAME; } @Override public void setup( String identifier, ArtifactFactory factory, Object context, CallMeta callMeta, Document data) { logger.info("ExternalWMSArtifact.setup"); super.setup(identifier, factory, context, callMeta, data); String ids = getDatacageIDValue(data); if (ids != null && ids.length() > 0) { addStringData("ids", ids); } else { throw new IllegalArgumentException("No attribute 'ids' found!"); } List<Facet> fs = new ArrayList<Facet>(); WMSBackgroundState s = (WMSBackgroundState) getCurrentState(context); s.computeInit(this, hash(), context, callMeta, fs); if (!fs.isEmpty()) { addFacets(getCurrentStateId(), fs); } } @Override protected void initialize( Artifact artifact, Object context, CallMeta callMeta) { // do nothing } @Override public State getCurrentState(Object cc) { State s = new ExternalWMSState(this); List<Facet> fs = getFacets(getCurrentStateId()); DefaultOutput o = new DefaultOutput( "floodmap", "floodmap", "image/png", fs, "map"); s.getOutputs().add(o); return s; } /** * Get a list containing the one and only State. * @param context ignored. * @return list with one and only state. */ @Override protected List<State> getStates(Object context) { ArrayList<State> states = new ArrayList<State>(); states.add(getCurrentState(context)); return states; } public static class ExternalWMSState extends WMSBackgroundState { protected ExternalWMSArtifact artifact; protected String ids; public ExternalWMSState(ExternalWMSArtifact artifact) { super(); this.artifact = artifact; } protected String getIds() { if (ids == null || ids.length() == 0) { ids = artifact.getDataAsString("ids"); } return ids; } @Override protected String getFacetType() { return FLOODMAP_EXTERNAL_WMS; } @Override protected String getSrid() { return ""; } @Override protected String getUrl() { String ids = getIds(); String[] parts = ids.split(";"); return parts[0]; } @Override protected String getLayer() { String ids = getIds(); String[] parts = ids.split(";"); return parts[1]; } @Override protected String getTitle(CallMeta meta) { String ids = getIds(); String[] parts = ids.split(";"); return parts[2]; } } // end of class ExternalWMSState } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :