Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/FeedServiceImpl.java @ 3497:88feb3347aa5

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Implement a ProxyServlet Implement a ProxyServlet to be able to restrict the access to the mapserver too. All queries to the provided map services should go throught this new ProxyServlet. Currently the ProxyServlet can only handle HTTP GET requests. flys-client/trunk@5221 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Bjoern Ricks <bjoern.ricks@intevation.de>
date Thu, 16 Aug 2012 14:42:36 +0000
parents d0a9acddbea2
children
rev   line source
851
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1 package de.intevation.flys.client.server;
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2
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3 import java.util.ArrayList;
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4 import java.util.List;
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5
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6 import org.w3c.dom.Document;
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7
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8 import org.apache.log4j.Logger;
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9
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10 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
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11
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12 import de.intevation.artifacts.common.ArtifactNamespaceContext;
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13 import de.intevation.artifacts.common.utils.ClientProtocolUtils;
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14 import de.intevation.artifacts.common.utils.XMLUtils;
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15
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16 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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17 import de.intevation.artifacts.httpclient.http.HttpClient;
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18 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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19 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler;
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20
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21 import de.intevation.flys.client.shared.exceptions.ServerException;
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22 import de.intevation.flys.client.shared.model.Artifact;
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23 import de.intevation.flys.client.shared.model.Data;
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24 import de.intevation.flys.client.shared.model.DataItem;
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25 import de.intevation.flys.client.client.services.FeedService;
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26
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27 /**
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28 * This interface provides a method that bundles the artifact specific
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29 * operation FEED.
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30 */
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31 public class FeedServiceImpl
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32 extends RemoteServiceServlet
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33 implements FeedService
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34 {
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35 private static final Logger logger = Logger.getLogger(FeedServiceImpl.class);
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36
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37
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38 /** XPath that points to the result type of a feed or advance operation.*/
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39 public static final String XPATH_RESULT = "/art:result/@art:type";
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40
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41 /** XPath that points to the result type of a feed or advance operation.*/
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42 public static final String XPATH_RESULT_MSG = "/art:result/text()";
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43
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44 /** A constant that marks errors.*/
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45 public static final String OPERATION_FAILURE = "FAILURE";
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46
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47 /** The error message key that is thrown if an error occured while feeding
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48 * new data.*/
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49 public static final String ERROR_FEED_DATA = "error_feed_data";
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50
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51
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52 /**
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53 * This method triggers the FEED operation.
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54 *
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55 * @param artifact The artifact that needs to be fed.
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56 * @param data An array of Data objects that contain the information that
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57 * are used for the FEED operation.
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58 *
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59 * @return a new artifact parsed from the description of FEED.
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60 */
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61 public Artifact feed(
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62 String locale,
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63 Artifact artifact,
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64 Data[] data)
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65 throws ServerException
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66 {
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67 logger.info("StepForwardServiceImpl.feed");
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68
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69 String url = getServletContext().getInitParameter("server-url");
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70
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71 Document feed = ClientProtocolUtils.newFeedDocument(
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72 artifact.getUuid(),
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73 artifact.getHash(),
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74 createKVP(data));
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75
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76 HttpClient client = new HttpClientImpl(url, locale);
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77
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78 try {
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79 Document description = (Document) client.feed(
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80 new de.intevation.artifacts.httpclient.objects.Artifact(
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81 artifact.getUuid(),
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82 artifact.getHash()),
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83 feed,
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84 new DocumentResponseHandler());
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85
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86 if (description == null) {
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87 logger.warn("StepForwardService.feed() - FAILED");
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88 throw new ServerException(ERROR_FEED_DATA);
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89 }
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90
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91 String result = XMLUtils.xpathString(
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92 description,
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93 XPATH_RESULT,
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94 ArtifactNamespaceContext.INSTANCE);
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95
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96 if (result == null || !result.equals(OPERATION_FAILURE)) {
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97 logger.debug("StepForwardService.feed() - SUCCESS");
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98 return (Artifact) new FLYSArtifactCreator().create(description);
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99 }
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100 else if (result != null && result.equals(OPERATION_FAILURE)) {
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101 String msg = XMLUtils.xpathString(
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102 description,
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103 XPATH_RESULT_MSG,
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104 ArtifactNamespaceContext.INSTANCE);
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105 throw new ServerException(msg);
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106 }
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107 }
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108 catch (ConnectionException ce) {
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109 logger.error(ce, ce);
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110 }
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111
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112 logger.warn("StepForwardService.feed() - FAILED");
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113 throw new ServerException(ERROR_FEED_DATA);
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114 }
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115
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116
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117 /**
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118 * Triggers FEED operation, many artifacts, same data item(s).
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119 *
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120 * @param artifacts Artifacts that shall be fed.
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121 * @param data An array of Data objects that contain the information that
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122 * are used for the FEED operation.
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123 *
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124 * @return a new artifact parsed from the description of FEED.
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125 */
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126 public List<Artifact> feedMany(
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127 String locale,
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128 List<Artifact> artifacts,
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129 Data[] data)
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130 throws ServerException
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131 {
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132 logger.info("StepForwardServiceImpl.feedMany");
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133
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134 String url = getServletContext().getInitParameter("server-url");
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135
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136 List<Artifact> resultArtifacts = new ArrayList<Artifact>();
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137
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138 for (Artifact artifact: artifacts) {
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139 logger.info("feedMany: Relay to StepForwardServiceImpl.feed");
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140 Artifact fedArtifact = feed(locale, artifact, data);
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141 resultArtifacts.add(fedArtifact);
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142 }
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143
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144 return resultArtifacts;
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145 }
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146
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147
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148 /**
851
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149 * This method creates an array of key/value pairs from an array of Data
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150 * objects. The string array is used as parameter for the feed() operation.
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151 *
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152 * @param data The data that should be transformed into the string array.
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153 *
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154 * @return a string array that contains key/value pairs.
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155 */
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156 protected String[][] createKVP(Data[] data) {
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157 String[][] kvp = new String[data.length][];
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158
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159 int i = 0;
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160
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161 for (Data d: data) {
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162 DataItem[] items = d.getItems();
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163 String key = d.getLabel();
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164 String value = d.getStringValue();
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165
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166 kvp[i++] = new String[] { key, value };
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167 }
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168
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169 return kvp;
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170 }
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171 }
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172 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org