Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/access/SQRelationAccess.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 aaf810d4ec82
children
rev   line source
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1 package de.intevation.flys.artifacts.access;
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2
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3 import java.util.Date;
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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 de.intevation.flys.artifacts.FLYSArtifact;
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8 import de.intevation.flys.artifacts.model.DateRange;
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9
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10 public class SQRelationAccess
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11 extends RiverAccess
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12 {
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13 private static Logger log = Logger.getLogger(SQRelationAccess.class);
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14
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15 protected Double location;
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16
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17 protected DateRange period;
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18
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19 protected Double outliers;
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20
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21 private String method;
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22
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23 public SQRelationAccess() {
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24 }
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25
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26 public SQRelationAccess(FLYSArtifact artifact) {
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27 super(artifact);
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28 }
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29
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30 public Double getLocation() {
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31 if (location == null) {
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32 // XXX: The parameter name suggests plural!?
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33 location = getDouble("ld_locations");
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34 }
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35
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36 if (log.isDebugEnabled()) {
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37 log.debug("location: " + location);
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38 }
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39
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40 return location;
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41 }
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42
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43 public DateRange getPeriod() {
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44 if (period == null) {
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45 Long start = getLong("start");
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46 Long end = getLong("end");
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47
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48 if (start != null && end != null) {
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49 period = new DateRange(new Date(start), new Date(end));
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50 }
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51 }
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52
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53 return period;
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54 }
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55
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56 public Double getOutliers() {
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57 if (outliers == null) {
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58 outliers = getDouble("outliers");
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59 }
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60 if (log.isDebugEnabled()) {
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61 log.debug("outliers: " + outliers);
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62 }
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63 return outliers;
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64 }
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65
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66 public String getOutlierMethod() {
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67 if (method == null) {
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68 method = getString("outlier-method");
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69 }
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70 if (log.isDebugEnabled()) {
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71 log.debug("outlier-method: " + method);
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72 }
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73 return method;
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74 }
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75 }
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76 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org