Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/CollectionMonitor.java @ 8856:5e38e2924c07 3.2.x

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Fix code style.
author Tom Gottfried <tom@intevation.de>
date Thu, 18 Jan 2018 20:12:01 +0100
parents f8e1af4e2f69
children 5030c46d8cb4
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;
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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(
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123 D4EArtifact artifact,
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124 String [] outs
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125 ) {
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126 StringBuilder sb = new StringBuilder(artifact.hash());
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127 // XXX: The hash really should be unique enough.
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128 for (String out: outs) {
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129 sb.append(';').append(out);
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130 }
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131 return sb.toString();
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132 }
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133
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134
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135 /**
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136 * Get outputnames from current state (only the ones for which
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137 * facets exist).
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138 */
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139 private static final String [] extractOutputNames(
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140 D4EArtifact flys,
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141 CallContext context
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142 ) {
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143 if (flys instanceof ChartArtifact) {
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144 return new String[0];
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145 }
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146
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147 List<Output> outs = flys.getCurrentOutputs(context);
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148
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149 int num = outs == null ? 0 : outs.size();
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150
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151 String[] names = new String[num];
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152
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153 for (int i = 0; i < num; i++) {
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154 names[i] = outs.get(i).getName();
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155 }
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156
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157 // Sort them to make cache key generation consistent.
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158 Arrays.sort(names);
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159
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160 return names;
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161 }
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162
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163
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164 /**
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165 * Creates Map from Strings "recommended" to "true".
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166 */
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167 private static final Map<String, Object> getNoneUserSpecificParameters(
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168 D4EArtifact flys,
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169 CallContext context)
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170 {
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171 Map<String, Object> params = new HashMap<String, Object>();
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172 params.put("recommended", "true");
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173
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174 return params;
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175 }
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176 }
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177 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org