Mercurial > dive4elements > river
annotate flys-client/src/main/java/de/intevation/flys/client/server/DischargeInfoServiceImpl.java @ 5779:ebec12def170
Datacage: Add a pool of builders to make it multi threadable.
XML DOM is not thread safe. Therefore the old implementation only allowed one thread
to use the builder at a time. As the complexity of the configuration
has increased over time this has become a bottleneck of the whole application
because it took quiet some time to build a result. Furthermore the builder code path
is visited very frequent. So many concurrent requests were piled up
resulting in long waits for the users.
To mitigate this problem a round robin pool of builders is used now.
Each of the pooled builders has an independent copy of the XML template
and can be run in parallel.
The number of builders is determined by the system property
'flys.datacage.pool.size'. It defaults to 4.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Sun, 21 Apr 2013 12:48:09 +0200 |
parents | 67468c90ca68 |
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rev | line source |
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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 import org.w3c.dom.Element; |
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8 import org.w3c.dom.NodeList; |
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9 |
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10 import org.apache.log4j.Logger; |
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11 |
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12 import com.google.gwt.user.server.rpc.RemoteServiceServlet; |
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13 |
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14 import de.intevation.artifacts.common.ArtifactNamespaceContext; |
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15 import de.intevation.artifacts.common.utils.XMLUtils; |
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16 |
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17 import de.intevation.artifacts.httpclient.exceptions.ConnectionException; |
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18 import de.intevation.artifacts.httpclient.http.HttpClient; |
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19 import de.intevation.artifacts.httpclient.http.HttpClientImpl; |
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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.client.services.DischargeInfoService; |
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23 import de.intevation.flys.client.shared.model.DischargeInfoObject; |
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24 import de.intevation.flys.client.shared.model.DischargeInfoObjectImpl; |
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25 |
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26 |
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27 /** |
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28 * @author <a href="mailto:raimund.renkert@intevation.de">Raimund Renkert</a> |
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29 */ |
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30 public class DischargeInfoServiceImpl |
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31 extends RemoteServiceServlet |
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32 implements DischargeInfoService |
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33 { |
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34 private static final Logger logger = |
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35 Logger.getLogger(DischargeInfoServiceImpl.class); |
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36 |
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37 public static final String ERROR_NO_DISCHARGEINFO_FOUND = |
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38 "error_no_dischargeinfo_found"; |
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39 |
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40 public static final String XPATH_DISTANCES = "art:discharges/art:discharge"; |
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41 |
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42 |
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43 public DischargeInfoObject[] getDischargeInfo( |
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44 String locale, |
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45 long gauge) |
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46 throws ServerException |
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47 { |
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48 logger.info("DichargeInfoServiceImpl.getDischargeInfo"); |
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49 |
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50 String url = getServletContext().getInitParameter("server-url"); |
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51 |
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52 Document doc = XMLUtils.newDocument(); |
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53 |
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54 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator( |
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55 doc, |
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56 ArtifactNamespaceContext.NAMESPACE_URI, |
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57 ArtifactNamespaceContext.NAMESPACE_PREFIX); |
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58 |
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59 Element gaugeEl = ec.create("gauge"); |
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60 gaugeEl.setTextContent(String.valueOf(gauge)); |
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61 |
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62 doc.appendChild(gaugeEl); |
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63 |
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64 HttpClient client = new HttpClientImpl(url, locale); |
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65 |
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66 try { |
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67 Document result = client.callService(url, "dischargeinfo", doc); |
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68 |
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69 logger.debug("Extract discharge info objects now."); |
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70 DischargeInfoObject[] objects = extractDischargeInfoObjects(result); |
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71 |
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72 if (objects != null && objects.length > 0) { |
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73 return objects; |
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74 } |
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75 } |
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76 catch (ConnectionException ce) { |
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77 logger.error(ce, ce); |
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78 } |
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79 |
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80 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND); |
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81 } |
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82 |
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83 protected DischargeInfoObject[] extractDischargeInfoObjects( |
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84 Document result |
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85 ) |
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86 throws ServerException { |
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87 NodeList list = result.getElementsByTagName("discharge"); |
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88 |
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89 if (list == null || list.getLength() == 0) { |
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90 logger.warn("No discharge info found."); |
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91 throw new ServerException(ERROR_NO_DISCHARGEINFO_FOUND); |
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92 } |
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93 |
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94 int num = list.getLength(); |
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95 logger.debug("Response contains " + num + " objects."); |
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96 |
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97 List<DischargeInfoObject> objects = |
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98 new ArrayList<DischargeInfoObject>(num); |
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99 |
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100 for (int i = 0; i < num; i++) { |
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101 DischargeInfoObject obj = buildDischargeInfoObject( |
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102 (Element)list.item(i)); |
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103 |
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104 if (obj != null) { |
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105 objects.add(obj); |
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106 } |
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107 } |
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108 |
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109 logger.debug("Retrieved " + objects.size() + " discharges."); |
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110 |
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111 return (DischargeInfoObject[]) |
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112 objects.toArray(new DischargeInfoObject[num]); |
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113 |
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114 } |
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115 |
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116 protected DischargeInfoObject buildDischargeInfoObject(Element node) { |
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117 |
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118 String desc = node.getAttribute("description").trim(); |
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119 String start = node.getAttribute("start").trim(); |
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120 String end = node.getAttribute("end").trim(); |
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121 |
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122 if (start.length() > 0 && end.length() > 0) { |
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123 try { |
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124 Integer startYear = new Integer(start); |
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125 Integer endYear = new Integer(end); |
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126 return new DischargeInfoObjectImpl(desc, startYear, endYear); |
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127 } |
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128 catch (NumberFormatException nfe) { |
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129 logger.warn(nfe.getLocalizedMessage()); |
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130 } |
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131 } |
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132 |
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133 logger.warn("Invalid distance info object found."); |
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134 |
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135 return null; |
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136 } |
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137 } |
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138 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |