Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/StepForwardServiceImpl.java @ 4489:fea3e4b6faba
Return after sending a redirect
Maybe this avoids the internel state errors in tomcat.
author | Björn Ricks <bjoern.ricks@intevation.de> |
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date | Wed, 14 Nov 2012 10:37:21 +0100 |
parents | d0a9acddbea2 |
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1 package de.intevation.flys.client.server; |
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2 |
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3 import org.w3c.dom.Document; |
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4 |
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5 import org.apache.log4j.Logger; |
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6 |
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7 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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8 import de.intevation.artifacts.common.utils.ClientProtocolUtils; |
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9 import de.intevation.artifacts.common.utils.XMLUtils; |
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10 |
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11 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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12 import de.intevation.artifacts.httpclient.http.HttpClient; |
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13 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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14 import de.intevation.artifacts.httpclient.http.response.DocumentResponseHandler; |
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15 |
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16 import de.intevation.flys.client.shared.exceptions.ServerException; |
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17 import de.intevation.flys.client.shared.model.Artifact; |
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18 import de.intevation.flys.client.shared.model.ArtifactDescription; |
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19 import de.intevation.flys.client.shared.model.Data; |
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20 import de.intevation.flys.client.shared.model.DataItem; |
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21 import de.intevation.flys.client.client.services.StepForwardService; |
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22 |
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23 |
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24 /** |
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25 * This interface provides a method that bundles the artifact specific |
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26 * operations FEED and ADVANCE. |
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27 * |
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28 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> |
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29 */ |
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30 public class StepForwardServiceImpl |
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31 extends AdvanceServiceImpl |
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32 implements StepForwardService |
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33 { |
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34 private static final Logger logger = |
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35 Logger.getLogger(StepForwardServiceImpl.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 wraps the artifact operations FEED and ADVANCE. FEED is |
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54 * always triggerd, ADVANCE only, if there is at least one reachable state. |
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55 * |
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56 * @param locale The locale used for the request. |
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57 * @param artifact The artifact that needs to be fed. |
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58 * @param data An array of Data objects that contain the information that |
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59 * |
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60 * @return the modified artifact. |
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61 */ |
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62 public Artifact go(String locale, Artifact artifact, Data[] data) |
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63 throws ServerException |
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64 { |
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65 logger.info("StepForwardServiceImpl.go"); |
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66 |
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67 String url = getServletContext().getInitParameter("server-url"); |
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68 |
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69 Artifact afterFeed = feed(url, locale, artifact, data); |
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70 |
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71 if (afterFeed == null) { |
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72 logger.warn("StepForwardService.feed() - FAILED"); |
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73 throw new ServerException(ERROR_FEED_DATA); |
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74 } |
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75 |
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76 ArtifactDescription desc = afterFeed.getArtifactDescription(); |
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77 String[] reachable = desc.getReachableStates(); |
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78 |
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79 if (reachable == null || reachable.length == 0) { |
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80 logger.debug("Did not find any reachable state."); |
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81 return afterFeed; |
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82 } |
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83 |
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84 // We use the first reachable state as default target, maybe we need to |
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85 // change this later. |
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86 return advance(locale, afterFeed, reachable[0]); |
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87 } |
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88 |
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89 |
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90 /** |
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91 * This method triggers the FEED operation. |
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92 * |
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93 * @param url The url of the artifact server. |
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94 * @param artifact The artifact that needs to be fed. |
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95 * @param data An array of Data objects that contain the information that |
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96 * are used for the FEED operation. |
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97 * |
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98 * @return a new artifact parsed from the description of FEED. |
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99 */ |
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100 protected Artifact feed( |
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101 String url, |
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102 String locale, |
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103 Artifact artifact, |
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104 Data[] data) |
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105 throws ServerException |
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106 { |
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107 logger.info("StepForwardServiceImpl.feed"); |
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108 |
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109 Document feed = ClientProtocolUtils.newFeedDocument( |
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110 artifact.getUuid(), |
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111 artifact.getHash(), |
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112 createKVP(data)); |
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113 |
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114 HttpClient client = new HttpClientImpl(url, locale); |
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115 |
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116 try { |
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117 Document description = (Document) client.feed( |
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118 new de.intevation.artifacts.httpclient.objects.Artifact( |
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119 artifact.getUuid(), |
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120 artifact.getHash()), |
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121 feed, |
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122 new DocumentResponseHandler()); |
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123 |
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124 if (description == null) { |
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125 logger.warn("StepForwardService.feed() - FAILED"); |
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126 throw new ServerException(ERROR_FEED_DATA); |
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127 } |
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128 |
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129 String result = XMLUtils.xpathString( |
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130 description, |
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131 XPATH_RESULT, |
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132 ArtifactNamespaceContext.INSTANCE); |
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133 |
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134 if (result == null || !result.equals(OPERATION_FAILURE)) { |
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135 logger.debug("StepForwardService.feed() - SUCCESS"); |
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136 return (Artifact) new FLYSArtifactCreator().create(description); |
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137 } |
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138 else if (result != null && result.equals(OPERATION_FAILURE)) { |
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139 String msg = XMLUtils.xpathString( |
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140 description, |
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141 XPATH_RESULT_MSG, |
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142 ArtifactNamespaceContext.INSTANCE); |
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143 throw new ServerException(msg); |
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144 } |
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145 } |
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146 catch (ConnectionException ce) { |
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147 logger.error(ce, ce); |
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148 } |
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149 |
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150 logger.warn("StepForwardService.feed() - FAILED"); |
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151 throw new ServerException(ERROR_FEED_DATA); |
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152 } |
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153 |
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154 |
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155 /** |
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156 * This method creates an array of key/value pairs from an array of Data |
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157 * objects. The string array is used as parameter for the feed() operation. |
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158 * |
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159 * @param data The data that should be transformed into the string array. |
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160 * |
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161 * @return a string array that contains key/value pairs. |
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162 */ |
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163 protected String[][] createKVP(Data[] data) { |
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164 String[][] kvp = new String[data.length][]; |
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165 |
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166 int i = 0; |
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167 |
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168 for (Data d: data) { |
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169 DataItem[] items = d.getItems(); |
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170 String key = d.getLabel(); |
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171 String value = d.getStringValue(); |
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172 |
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173 kvp[i++] = new String[] { key, value }; |
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174 } |
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175 |
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176 return kvp; |
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177 } |
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178 } |
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179 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |