svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.remoteclient / src / main / java / org / gvsig / remoteclient / taskplanning / retrieving / RequestManager.java @ 40769
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1 | 40559 | jjdelcerro | /**
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2 | * gvSIG. Desktop Geographic Information System.
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3 | *
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4 | * Copyright (C) 2007-2013 gvSIG Association.
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5 | *
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6 | * This program is free software; you can redistribute it and/or
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7 | * modify it under the terms of the GNU General Public License
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8 | * as published by the Free Software Foundation; either version 3
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9 | * of the License, or (at your option) any later version.
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10 | *
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11 | * This program is distributed in the hope that it will be useful,
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12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | * GNU General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU General Public License
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17 | * along with this program; if not, write to the Free Software
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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19 | * MA 02110-1301, USA.
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20 | *
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21 | * For any additional information, do not hesitate to contact us
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22 | * at info AT gvsig.com, or visit our website www.gvsig.com.
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23 | */
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24 | 40435 | jjdelcerro | package org.gvsig.remoteclient.taskplanning.retrieving; |
25 | |||
26 | import java.io.File; |
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27 | import java.net.MalformedURLException; |
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28 | import java.util.Hashtable; |
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29 | import java.util.TreeMap; |
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30 | |||
31 | import org.gvsig.remoteclient.taskplanning.IQueue; |
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32 | |||
33 | /**
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34 | * pa administrar les tasques (la hist?ria aquella
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35 | * de que hi haja una cola per a cada servidor)
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36 | * @author Luis W. Sevilla (sevilla_lui@gva.es)
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37 | */
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38 | public class RequestManager { |
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39 | private boolean debug = true; |
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40 | |||
41 | private static RequestManager instance; |
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42 | private TreeMap serversTable = new TreeMap(); |
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43 | private RequestManager() {} // Avoid public instantiation |
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44 | |||
45 | public static RequestManager getInstance() { |
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46 | if (instance == null) |
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47 | instance = new RequestManager();
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48 | return instance;
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49 | } |
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50 | |||
51 | |||
52 | public URLRetrieveTask addURLRequest(URLRequest request, RetrieveListener listener) {
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53 | try {
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54 | |||
55 | // TODO canviar per a quetorne el Request antic, que la request guarde el
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56 | // seu estat aix? com la llista de listeners
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57 | File f = getPreviousDownloadedURLRequest(request);
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58 | |||
59 | if (f!=null) { |
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60 | // The file was already requested and it is in the cache or
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61 | // the download is in process
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62 | |||
63 | // Overwrite the file name with the file in the cache's one.
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64 | request.setFileName(f.getAbsolutePath()); |
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65 | System.out.println(request.getUrl()+" is cached at '"+f.getAbsolutePath()+"'"); |
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66 | |||
67 | |||
68 | // get this server's task queue
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69 | RetrieveQueue serverQueue = (RetrieveQueue) getQueue(request.getHost()); |
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70 | |||
71 | // Look up the previous cached jobs
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72 | |||
73 | URLRetrieveTask workingTask = serverQueue.getURLPreviousRequest(request); |
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74 | if (workingTask == null) { |
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75 | // Task already done. Notify listener
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76 | if (debug)
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77 | System.err.println("done job found: "+request.getUrl()); |
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78 | RetrieveEvent event = new RetrieveEvent();
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79 | event.setType(RetrieveEvent.REQUEST_FINISHED); |
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80 | listener.transferEventReceived(event); |
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81 | |||
82 | } else {
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83 | // The task is working yet, will register the listener
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84 | |||
85 | // TODO no va b?... perqu? la cola va buidant-se molt r?pidament
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86 | // per a fer que vaja tamb? hi hauria que registrar en cache
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87 | // lo que s'est? baixant al principi de l'execute();
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88 | if (debug)
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89 | System.err.println("working job found: "+request.getUrl()); |
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90 | workingTask.addRetrieveListener(listener); |
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91 | |||
92 | } |
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93 | } else {
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94 | // Pick an unrepeatable fileName
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95 | String host = request.getHost();
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96 | String fileName = request.getFileName();
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97 | File tempDir = new File(tempDirectoryPath); |
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98 | if (!tempDir.exists())
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99 | tempDir.mkdir(); |
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100 | String fileNamePrefix = tempDirectoryPath +
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101 | File.separator + host +
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102 | "-" ;
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103 | if (fileName.startsWith(fileNamePrefix))
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104 | fileName = fileName.substring(fileNamePrefix.length(), fileName.length()); |
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105 | |||
106 | // get this server's task queue
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107 | RetrieveQueue serverQueue = (RetrieveQueue) getQueue(request.getHost()); |
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108 | |||
109 | |||
110 | fileName = fileNamePrefix + fileName; |
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111 | |||
112 | request.setFileName(fileName); |
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113 | |||
114 | // TODO
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115 | // jo ac? comprovaria quin protocol, m?tode, host, etc... i crearia un
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116 | // objecte que tractara la desc?rrega segons el m?tode que li toca.
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117 | // algo en plan Strategy's
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118 | //
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119 | // per exemple si fem URLRetrieveTask una abstracta i tenim
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120 | //
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121 | // GET de tota la vida
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122 | // serverQueue.put(new HTTPGetRetrieveTask(request, listener));
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123 | //
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124 | // POST
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125 | // serverQueue.put(new HTTPPostRetrieveTask(request, listener));
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126 | //
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127 | // FTP
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128 | // serverQueue.put(new FTPRetrieveTask(request, listener));
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129 | //
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130 | // ????Xarxa local?????
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131 | // serverQueue.put(new SMBRetrieveTask(request, listener));
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132 | |||
133 | // Enqueue the request and the listener will be notified when done.
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134 | URLRetrieveTask task = new URLRetrieveTask(request, listener);
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135 | return (URLRetrieveTask) serverQueue.put(task);
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136 | } |
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137 | } catch (MalformedURLException e) { |
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138 | e.printStackTrace(); |
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139 | } |
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140 | return null; |
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141 | } |
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142 | |||
143 | private IQueue getQueue(String hostName) { |
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144 | RetrieveQueue queue = null;
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145 | if (serversTable.containsKey(hostName))
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146 | queue = (RetrieveQueue) serversTable.get(hostName); |
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147 | else {
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148 | // crea la cola
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149 | queue = new RetrieveQueue(hostName);
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150 | // pone la cola del server en marcha.
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151 | } |
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152 | return queue;
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153 | } |
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154 | |||
155 | |||
156 | private Hashtable downloadedFiles; |
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157 | private final String tempDirectoryPath = System.getProperty("java.io.tmpdir")+"tmp-andami"; |
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158 | /**
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159 | * Remove an URL from the system cache. The file will remain in the file
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160 | * system for further eventual uses.
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161 | * @param request
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162 | */
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163 | public void removeURLRequest(URLRequest request) { |
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164 | if (downloadedFiles != null && downloadedFiles.containsKey(request)) |
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165 | downloadedFiles.remove(request); |
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166 | } |
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167 | /**
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168 | * Adds an URL to the table of downloaded files for further uses. If the URL
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169 | * already exists in the table its filePath value is updated to the new one and
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170 | * the old file itself is removed from the file system.
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171 | *
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172 | * @param url
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173 | * @param filePath
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174 | */
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175 | protected void addDownloadedURLRequest(URLRequest request, String filePath){ |
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176 | if (downloadedFiles==null) |
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177 | downloadedFiles = new Hashtable(); |
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178 | String fileName = (String) downloadedFiles.put(request, filePath); |
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179 | if (fileName!=null){ |
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180 | File f = new File(fileName); |
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181 | if (f.exists())
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182 | f.delete(); |
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183 | } |
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184 | } |
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185 | /**
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186 | * Returns the content of this URL as a file from the file system.<br>
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187 | * <p>
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188 | * If the URL has been already downloaded in this session and notified
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189 | * to the system using the static <b>Utilities.addDownloadedURL(URL)</b>
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190 | * method, it can be restored faster from the file system avoiding to
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191 | * download it again.
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192 | * </p>
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193 | * @param url
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194 | * @return File containing this URL's content or null if no file was found.
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195 | */
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196 | private File getPreviousDownloadedURLRequest(URLRequest request){ |
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197 | File f = null; |
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198 | if (downloadedFiles!=null && downloadedFiles.containsKey(request)){ |
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199 | String filePath = (String) downloadedFiles.get(request); |
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200 | f = new File(filePath); |
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201 | } |
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202 | return f;
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203 | } |
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204 | |||
205 | } |