Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/datacage/templating/BuilderPool.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.datacage.templating;
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10
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11 import java.util.ArrayDeque;
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12 import java.util.Deque;
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13 import java.util.List;
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14 import java.util.Map;
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15
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16 import java.sql.SQLException;
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17
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18 import javax.xml.parsers.DocumentBuilder;
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19 import javax.xml.parsers.DocumentBuilderFactory;
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20 import javax.xml.parsers.ParserConfigurationException;
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21
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22 import org.apache.log4j.Logger;
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23
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24 import org.w3c.dom.Document;
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25 import org.w3c.dom.Node;
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26
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27 /** A little round robin pool of builders to mitigate
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28 * the fact the XML DOM documents are not thread safe.
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29 */
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30 public class BuilderPool
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31 {
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32 private static Logger log = Logger.getLogger(BuilderPool.class);
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33
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34 private static final int DEFAULT_POOL_SIZE = 4;
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35
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36 private static final int POOL_SIZE = Math.max(
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37 Integer.getInteger("flys.datacage.pool.size", DEFAULT_POOL_SIZE), 1);
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38
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39 private Deque<Builder> pool;
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40
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41 public BuilderPool(Document document) {
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42 this(document, POOL_SIZE);
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43 }
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44
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45 public BuilderPool(Document document, int poolSize) {
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46
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47 if (log.isDebugEnabled()) {
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48 log.debug("Create build pool with " + poolSize + " elements.");
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49 }
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50
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51 pool = new ArrayDeque<Builder>(poolSize);
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52 for (int i = 0; i < poolSize; ++i) {
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53 pool.add(new Builder(cloneDocument(document)));
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54 }
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55 }
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56
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57 private final static Document cloneDocument(Document document) {
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58
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59 try {
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60 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
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61 DocumentBuilder db = dbf.newDocumentBuilder();
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62
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63 Node origRoot = document.getDocumentElement();
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64
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65 Document copy = db.newDocument();
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66 Node copyRoot = copy.importNode(origRoot, true);
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67 copy.appendChild(copyRoot);
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68
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69 return copy;
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70 }
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71 catch (ParserConfigurationException pce) {
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72 log.error(pce);
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73 }
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74
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75 log.error("Returning original document. This will lead to threading issues.");
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76
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77 return document;
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78 }
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79
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80 public void build(
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81 List<Builder.NamedConnection> connections,
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82 Node output,
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83 Map<String, Object> parameters
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84 )
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85 throws SQLException
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86 {
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87 Builder builder;
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88 synchronized (pool) {
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89 try {
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90 while ((builder = pool.poll()) == null) {
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91 pool.wait();
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92 }
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93 }
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94 catch (InterruptedException ie) {
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95 log.debug("Waiting for builder interrupted. Build canceled.");
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96 return;
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97 }
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98 }
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99 try {
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100 builder.build(connections, output, parameters);
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101 }
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102 finally {
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103 synchronized (pool) {
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104 pool.add(builder);
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105 pool.notify();
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106 }
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107 }
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108 }
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109 }
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110 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org