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annotate flys-client/src/main/java/de/intevation/flys/client/server/DescribeArtifactServiceImpl.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 bc06a671ef60
children
rev   line source
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1 package de.intevation.flys.client.server;
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2
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3 import org.w3c.dom.Document;
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4
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5 import org.apache.log4j.Logger;
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6
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7 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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8
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9 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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10
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11 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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12 import de.intevation.artifacts.httpclient.http.HttpClient;
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13 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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14 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler;
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15
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16 import de.intevation.flys.client.shared.exceptions.ServerException;
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17 import de.intevation.flys.client.shared.model.Artifact;
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18 import de.intevation.flys.client.client.services.DescribeArtifactService;
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19
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20
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21 /**
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22 * This interface provides artifact specific operation DESCRIBE.
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23 *
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24 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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25 */
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26 public class DescribeArtifactServiceImpl
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27 extends RemoteServiceServlet
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28 implements DescribeArtifactService
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29 {
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30 private static final Logger logger =
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31 Logger.getLogger(DescribeArtifactServiceImpl.class);
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32
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33
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34 public static final String ERROR_DESCRIBE_ARTIFACT =
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35 "error_describe_artifact";
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36
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37
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38 public Artifact describe(String locale, Artifact artifact)
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39 throws ServerException
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40 {
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41 logger.info("DescribeArtifactServiceImpl.describe");
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43 String url = getServletContext().getInitParameter("server-url");
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45 Document describe = ClientProtocolUtils.newDescribeDocument(
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46 artifact.getUuid(),
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47 artifact.getHash(),
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48 true);
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49
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50 HttpClient client = new HttpClientImpl(url, locale);
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51
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52 try {
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53 logger.debug("Start Http request now.");
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54
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55 Document description = (Document) client.describe(
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56 new de.intevation.artifacts.httpclient.objects.Artifact(
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57 artifact.getUuid(),
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58 artifact.getHash()),
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59 describe,
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60 new DocumentResponseHandler());
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61
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62 if (description != null) {
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63 logger.debug("Finished Http request sucessfully!");
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64
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65 return (Artifact) new FLYSArtifactCreator().create(description);
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66 }
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67 }
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68 catch (ConnectionException ce) {
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69 ce.printStackTrace();
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70 }
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71
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72 throw new ServerException(ERROR_DESCRIBE_ARTIFACT);
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73 }
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74 }
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75 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org