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annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/BuilderPool.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/BuilderPool.java@bd047b71ab37
children 4897a58c8746
rev   line source
5831
bd047b71ab37 Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
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1 package org.dive4elements.river.artifacts.datacage.templating;
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2
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3 import java.util.ArrayDeque;
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4 import java.util.Deque;
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5 import java.util.List;
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6 import java.util.Map;
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7
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8 import java.sql.SQLException;
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9
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10 import javax.xml.parsers.DocumentBuilder;
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11 import javax.xml.parsers.DocumentBuilderFactory;
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12 import javax.xml.parsers.ParserConfigurationException;
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13
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14 import org.apache.log4j.Logger;
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15
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16 import org.w3c.dom.Document;
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17 import org.w3c.dom.Node;
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18
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19 /** A little round robin pool of builders to mitigate
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20 * the fact the XML DOM documents are not thread safe.
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21 */
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22 public class BuilderPool
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23 {
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24 private static Logger log = Logger.getLogger(BuilderPool.class);
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25
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26 private static final int DEFAULT_POOL_SIZE = 4;
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27
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28 private static final int POOL_SIZE = Math.max(
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29 Integer.getInteger("flys.datacage.pool.size", DEFAULT_POOL_SIZE), 1);
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30
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31 private Deque<Builder> pool;
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32
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33 public BuilderPool(Document document) {
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34 this(document, POOL_SIZE);
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35 }
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36
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37 public BuilderPool(Document document, int poolSize) {
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38
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39 if (log.isDebugEnabled()) {
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40 log.debug("Create build pool with " + poolSize + " elements.");
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41 }
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42
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43 pool = new ArrayDeque<Builder>(poolSize);
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44 for (int i = 0; i < poolSize; ++i) {
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45 pool.add(new Builder(cloneDocument(document)));
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46 }
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47 }
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48
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49 private final static Document cloneDocument(Document document) {
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50
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51 try {
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52 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
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53 DocumentBuilder db = dbf.newDocumentBuilder();
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54
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55 Node origRoot = document.getDocumentElement();
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56
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57 Document copy = db.newDocument();
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58 Node copyRoot = copy.importNode(origRoot, true);
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59 copy.appendChild(copyRoot);
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60
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61 return copy;
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62 }
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63 catch (ParserConfigurationException pce) {
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64 log.error(pce);
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65 }
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66
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67 log.error("Returning original document. This will lead to threading issues.");
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68
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69 return document;
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70 }
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71
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72 public void build(
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73 List<Builder.NamedConnection> connections,
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74 Node output,
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75 Map<String, Object> parameters
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76 )
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77 throws SQLException
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78 {
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79 Builder builder;
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80 synchronized (pool) {
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81 try {
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82 while ((builder = pool.poll()) == null) {
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83 pool.wait();
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84 }
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85 }
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86 catch (InterruptedException ie) {
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87 log.debug("Waiting for builder interrupted. Build canceled.");
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88 return;
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89 }
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90 }
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91 try {
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92 builder.build(connections, output, parameters);
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93 }
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94 finally {
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95 synchronized (pool) {
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96 pool.add(builder);
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97 pool.notify();
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98 }
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99 }
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100 }
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101 }
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102 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org