Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/CollectionMonitor.java @ 7593:60a5fc522ec4
Rename the Global Facet filter to reduce ambiguity with the old facet filter
author | Andre Heinecke <aheinecke@intevation.de> |
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date | Thu, 21 Nov 2013 15:37:43 +0100 |
parents | f8e1af4e2f69 |
children | 5e38e2924c07 |
rev | line source |
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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; |
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10 |
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11 import java.util.Arrays; |
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12 import java.util.HashMap; |
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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 net.sf.ehcache.Cache; |
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17 |
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18 import org.w3c.dom.Document; |
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19 import org.w3c.dom.Element; |
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20 import org.w3c.dom.Node; |
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21 import org.w3c.dom.NodeList; |
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22 |
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23 import org.dive4elements.artifacts.Artifact; |
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24 import org.dive4elements.artifacts.ArtifactNamespaceContext; |
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25 import org.dive4elements.artifacts.CallContext; |
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26 import org.dive4elements.artifacts.Hook; |
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27 |
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28 import org.dive4elements.artifacts.common.utils.XMLUtils; |
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29 import org.dive4elements.artifacts.common.utils.XMLUtils.ElementCreator; |
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30 |
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31 import org.dive4elements.artifactdatabase.state.Output; |
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32 |
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33 import org.dive4elements.river.artifacts.cache.CacheFactory; |
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34 import org.dive4elements.river.artifacts.datacage.Recommendations; |
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35 |
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36 /** Monitors collection changes. */ |
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37 public class CollectionMonitor implements Hook { |
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38 |
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39 public static final String CACHE_NAME = "recommendations"; |
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40 |
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41 @Override |
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42 public void setup(Node cfg) { |
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43 } |
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44 |
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45 |
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46 @Override |
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47 public void execute(Artifact artifact, CallContext context, Document doc) { |
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48 D4EArtifact flys = (D4EArtifact) artifact; |
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49 |
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50 // Do not generate recommendations for a loaded artifact. |
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51 String out = flys.getBoundToOut(); |
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52 if (out != null && !out.isEmpty()) { |
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53 return; |
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54 } |
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55 |
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56 NodeList results = doc.getElementsByTagNameNS( |
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57 ArtifactNamespaceContext.NAMESPACE_URI, "result"); |
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58 |
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59 if (results.getLength() < 1) { |
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60 return; |
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61 } |
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62 |
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63 Element result = (Element)results.item(0); |
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64 |
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65 result.appendChild(getRecommendedElement(flys, context, doc)); |
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66 } |
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67 |
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68 protected Element getRecommendedElement( |
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69 D4EArtifact artifact, |
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70 CallContext context, |
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71 Document doc |
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72 ) { |
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73 String [] outs = extractOutputNames(artifact, context); |
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74 |
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75 Element recommendations = null; |
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76 |
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77 Cache cache = CacheFactory.getCache(CACHE_NAME); |
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78 |
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79 if (cache != null) { |
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80 String key = generateCacheKey(artifact, outs); |
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81 |
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82 net.sf.ehcache.Element ce = cache.get(key); |
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83 if (ce != null) { // Found in cache. |
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84 Element e = (Element)ce.getValue(); |
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85 // Sync to avoid thread issues with XML DOM docs. |
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86 synchronized (e.getOwnerDocument()) { |
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87 recommendations = (Element)doc.importNode(e, true); |
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88 } |
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89 } else { // Not found in cache -> generate it. |
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90 Element r = createElement(XMLUtils.newDocument()); |
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91 |
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92 Recommendations.getInstance().recommend( |
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93 artifact, null, outs, |
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94 getNoneUserSpecificParameters(artifact, context), r); |
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95 |
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96 recommendations = (Element)doc.importNode(r, true); |
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97 |
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98 cache.put(new net.sf.ehcache.Element(key, r)); |
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99 } |
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100 } else { // No cache configured -> append directly. |
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101 |
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102 recommendations = createElement(doc); |
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103 |
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104 Recommendations.getInstance().recommend( |
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105 artifact, null, outs, |
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106 getNoneUserSpecificParameters(artifact, context), |
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107 recommendations); |
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108 } |
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109 |
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110 return recommendations; |
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111 } |
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112 |
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113 private static final Element createElement(Document doc) { |
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114 ElementCreator creator = new ElementCreator( |
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115 doc, |
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116 ArtifactNamespaceContext.NAMESPACE_URI, |
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117 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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118 |
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119 return creator.create("recommended-artifacts"); |
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120 } |
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121 |
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122 private static final String generateCacheKey(D4EArtifact artifact, String [] outs) { |
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123 StringBuilder sb = new StringBuilder(artifact.hash()); |
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124 // XXX: The hash really should be unique enough. |
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125 for (String out: outs) { |
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126 sb.append(';').append(out); |
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127 } |
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128 return sb.toString(); |
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129 } |
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130 |
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131 |
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132 /** |
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133 * Get outputnames from current state (only the ones for which |
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134 * facets exist). |
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135 */ |
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136 private static final String [] extractOutputNames( |
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137 D4EArtifact flys, |
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138 CallContext context |
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139 ) { |
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140 if (flys instanceof ChartArtifact) { |
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141 return new String[0]; |
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142 } |
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143 |
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144 List<Output> outs = flys.getCurrentOutputs(context); |
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145 |
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146 int num = outs == null ? 0 : outs.size(); |
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147 |
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148 String[] names = new String[num]; |
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149 |
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150 for (int i = 0; i < num; i++) { |
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151 names[i] = outs.get(i).getName(); |
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152 } |
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153 |
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154 // Sort them to make cache key generation consistent. |
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155 Arrays.sort(names); |
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156 |
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157 return names; |
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158 } |
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159 |
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160 |
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161 /** |
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162 * Creates Map from Strings "recommended" to "true". |
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163 */ |
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164 private static final Map<String, Object> getNoneUserSpecificParameters( |
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165 D4EArtifact flys, |
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166 CallContext context) |
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167 { |
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168 Map<String, Object> params = new HashMap<String, Object>(); |
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169 params.put("recommended", "true"); |
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170 |
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171 return params; |
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172 } |
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173 } |
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174 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |