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annotate flys-client/src/main/java/de/intevation/flys/client/server/ModuleServiceImpl.java @ 5779:ebec12def170

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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>
date Sun, 21 Apr 2013 12:48:09 +0200
parents fed914a42a10
children
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 de.intevation.artifacts.common.ArtifactNamespaceContext;
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4 import de.intevation.artifacts.common.utils.XMLUtils;
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5 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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6 import de.intevation.artifacts.httpclient.http.HttpClient;
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7 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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8 import de.intevation.flys.client.client.services.ModuleService;
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9 import de.intevation.flys.client.server.auth.User;
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10 import de.intevation.flys.client.shared.exceptions.ServerException;
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11 import de.intevation.flys.client.shared.model.DefaultModule;
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12 import de.intevation.flys.client.shared.model.Module;
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13
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14 import java.util.ArrayList;
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15 import java.util.List;
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16
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17 import javax.xml.xpath.XPathConstants;
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18
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19 import org.apache.log4j.Logger;
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20 import org.w3c.dom.Document;
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21 import org.w3c.dom.Element;
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22 import org.w3c.dom.NodeList;
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23
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24 public class ModuleServiceImpl
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25 extends RemoteServiceServlet
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26 implements ModuleService
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27 {
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28 private static final Logger logger =
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29 Logger.getLogger(ModuleServiceImpl.class);
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30
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31 public static final String XPATH_MODULES = "/art:modules/art:module";
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32
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33 public static final String ERROR_NO_MODULES_FOUND =
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34 "error_no_module_found";
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35
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36 @Override
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37 public Module[] list(String locale) throws ServerException {
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38 User user = this.getUser();
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39
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40 logger.info("ModuleService.list");
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41
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42 String url = getServletContext().getInitParameter("server-url");
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43
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44 // create dummy xml
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45 Document doc = XMLUtils.newDocument();
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46
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47 XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
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48 doc,
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49 ArtifactNamespaceContext.NAMESPACE_URI,
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50 ArtifactNamespaceContext.NAMESPACE_PREFIX);
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51
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52 Element dummy = ec.create("modules");
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53 doc.appendChild(dummy);
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54
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55 HttpClient client = new HttpClientImpl(url, locale);
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56 try {
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57 Document result = client.callService(url, "modules", doc);
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58
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59 NodeList list = (NodeList) XMLUtils.xpath(
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60 result,
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61 XPATH_MODULES,
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62 XPathConstants.NODESET,
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63 ArtifactNamespaceContext.INSTANCE);
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64
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65 if (list == null) {
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66 logger.warn("No modules found.");
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67
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68 throw new ServerException(ERROR_NO_MODULES_FOUND);
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69 }
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70
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71 int num = list.getLength();
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72
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73 List<Module> modules = new ArrayList<Module>(list.getLength());
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74 for(int i =0; i < num; i++) {
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75 Element em = (Element)list.item(i);
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76 String name = em.getAttributeNS(
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77 ArtifactNamespaceContext.NAMESPACE_URI, "name");
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78 String localname = em.getAttributeNS(
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79 ArtifactNamespaceContext.NAMESPACE_URI, "localname");
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80 String strselected = em.getAttributeNS(
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81 ArtifactNamespaceContext.NAMESPACE_URI, "selected");
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82 boolean selected = strselected == null ? false :
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83 strselected.equalsIgnoreCase("true");
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84 logger.debug("Found module " + name + " " + localname);
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85 if (user == null || user.canUseFeature("module:" + name)) {
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86 modules.add(new DefaultModule(name, localname, selected));
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87 }
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88 }
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89 return modules.toArray(new Module[modules.size()]);
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90 }
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91 catch (ConnectionException ce) {
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92 logger.error(ce, ce);
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93 }
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94
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95 throw new ServerException(ERROR_NO_MODULES_FOUND);
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96 }
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97 }
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98
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99 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 tw=80 :
http://dive4elements.wald.intevation.org