Mercurial > dive4elements > river

annotate flys-client/src/main/java/de/intevation/flys/client/server/FixingsKMChartServiceImpl.java @ 2488:88d44cae592e

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Added new proxy servlet to bridge the fixing km chart requests to the artefact server. flys-client/trunk@4275 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 19 Apr 2012 11:00:18 +0000
parents
children f905c936ffff
rev   line source
2488
88d44cae592e Added new proxy servlet to bridge the fixing km chart requests to the artefact server.
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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.utils.XMLUtils;
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4
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5 import de.intevation.artifacts.httpclient.http.HttpClient;
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6 import de.intevation.artifacts.httpclient.http.HttpClientImpl;
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7
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8 import de.intevation.artifacts.httpclient.exceptions.ConnectionException;
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9
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10 import de.intevation.artifacts.httpclient.http.response.StreamResponseHandler;
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11
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12 import java.io.IOException;
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13 import java.io.InputStream;
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14 import java.io.OutputStream;
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15
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16 import javax.servlet.http.HttpServlet;
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17 import javax.servlet.http.HttpServletRequest;
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18 import javax.servlet.http.HttpServletResponse;
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19
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20 import org.apache.log4j.Logger;
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21
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22 import org.w3c.dom.Document;
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23 import org.w3c.dom.Element;
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24 import org.w3c.dom.NodeList;
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25
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26 public class FixingsKMChartServiceImpl
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27 extends HttpServlet
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28 {
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29 private static final Logger log =
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30 Logger.getLogger(FixingsKMChartServiceImpl.class);
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31
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32 public static final String SERVICE_NAME = "fixings-km-chart";
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33
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34 public FixingsKMChartServiceImpl() {
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35 }
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36
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37 public void doGet(HttpServletRequest req, HttpServletResponse resp) {
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38
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39 log.info("FixingsKMChartServiceImpl.doGet");
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40
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41 String url = getServletContext().getInitParameter("server-url");
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42 String locale = req.getParameter("locale");
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43 String filter = req.getParameter("filter");
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44
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45 if (filter == null || filter.length() == 0) {
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46 log.warn("Missing 'filter' parameter.");
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47 return;
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48 }
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49
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50 if (locale == null || locale.length() == 0) {
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51 locale = "de";
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52 }
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53
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54 Document filterDoc = XMLUtils.jsonToXML(filter);
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55
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56 if (filterDoc == null) {
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57 log.warn("Creating filter document failed.");
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58 return;
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59 }
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60
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61 HttpClient client;
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62
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63 client = new HttpClientImpl(url, locale);
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64
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65 resp.setHeader("Content-Type", guessMIMEType(filterDoc));
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66
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67 InputStream in;
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68
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69 try {
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70 in = (InputStream)client.callService(
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71 url, // XXX: Why? The URL is passed by construction already.
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72 SERVICE_NAME,
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73 filterDoc,
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74 new StreamResponseHandler());
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75 }
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76 catch (ConnectionException ce) {
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77 log.error(ce);
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78 return;
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79 }
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80
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81 try {
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82 OutputStream out = resp.getOutputStream();
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83
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84 byte [] buf = new byte[4096];
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85 int i = -1;
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86 while ((i = in.read(buf)) >= 0) {
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87 out.write(buf, 0, i);
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88 }
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89 out.flush();
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90 }
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91 catch (IOException ioe) {
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92 log.error(ioe);
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93 }
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94 finally {
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95 try { in.close(); }
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96 catch (IOException ioe) { /* ignored */ }
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97 }
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98 }
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99
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100 protected static String guessMIMEType(Document document) {
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101
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102 NodeList formats = document.getElementsByTagName("format");
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103
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104 String format = "png";
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105
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106 if (formats.getLength() > 0) {
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107 String type = ((Element)formats.item(0)).getAttribute("type");
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108 if (type.length() > 0) {
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109 format = type;
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110 }
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111 }
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112
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113 return "image/" + format;
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114 }
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115 }
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116 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org