svn-gvsig-desktop / branches / MULTITHREADING_DEVELOPMENT / libraries / libRemoteServices / src / org / gvsig / remoteClient / taskplanning / retrieving / RequestManager.java @ 5292
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1 | 5156 | jaume | /*
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2 | * Created on 01-oct-2005
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3 | */
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4 | package org.gvsig.remoteClient.taskplanning.retrieving; |
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5 | |||
6 | 5180 | jaume | import java.io.File; |
7 | import java.net.MalformedURLException; |
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8 | 5245 | jaume | import java.util.ArrayList; |
9 | 5156 | jaume | import java.util.TreeMap; |
10 | 5245 | jaume | import java.util.Vector; |
11 | 5156 | jaume | |
12 | import org.gvsig.remoteClient.taskplanning.IQueue; |
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13 | |||
14 | /**
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15 | * pa administrar les tasques (la hist?ria aquella
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16 | * de que hi haja una cola per a cada servidor)
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17 | * @author Luis W. Sevilla (sevilla_lui@gva.es)
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18 | */
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19 | public class RequestManager { |
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20 | 5230 | jaume | private boolean debug = true; |
21 | 5180 | jaume | |
22 | private static RequestManager instance; |
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23 | 5156 | jaume | private TreeMap serversTable = new TreeMap(); |
24 | 5180 | jaume | private RequestManager() {} // Avoid public instantiation |
25 | |||
26 | public static RequestManager getInstance() { |
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27 | if (instance == null) |
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28 | instance = new RequestManager();
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29 | return instance;
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30 | 5156 | jaume | } |
31 | 5180 | jaume | |
32 | |||
33 | 5262 | jaume | public URLRequest addURLRequest(URLRequest request, RetrieveListener listener) {
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34 | 5180 | jaume | try {
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35 | 5245 | jaume | if (downloadedFiles.contains(request)) {
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36 | for (int i = 0; i < downloadedFiles.size(); i++) { |
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37 | URLRequest r = (URLRequest) downloadedFiles.get(i); |
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38 | if (r.equals(request)) {
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39 | 5262 | jaume | System.out.println(request.getUrl()+" is cached at '"+r.getFileName()+"'"); |
40 | request.setFileName(r.getFileName()); /* Uaaah!
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41 | * Si no pose a?? l'event es
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42 | * dispara abans que haja
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43 | * retornat el request
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44 | * reasignat i confon el
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45 | * sufixe.
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46 | */
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47 | 5245 | jaume | request = r; |
48 | break;
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49 | } |
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50 | } |
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51 | 5180 | jaume | |
52 | 5230 | jaume | |
53 | 5245 | jaume | synchronized (this) { |
54 | 5262 | jaume | if (request.getStatus() == RetrieveEvent.REQUEST_CANCELLED ||
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55 | request.getStatus() == RetrieveEvent.REQUEST_FAILED) { |
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56 | // The last requested URL was cancelled or it failed but now it is required again
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57 | // so, I have to remove it and add again.
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58 | removeURLRequest(request); |
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59 | return addURLRequest(request, listener);
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60 | } else if (request.getStatus() == RetrieveEvent.REQUEST_FINISHED) { |
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61 | 5245 | jaume | if (debug)
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62 | 5262 | jaume | System.err.println("done job found ("+request.getFileName()+")"); |
63 | 5245 | jaume | RetrieveEvent event = new RetrieveEvent();
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64 | 5292 | jaume | event.setFileName(request.getFileName()); |
65 | 5245 | jaume | event.setType(RetrieveEvent.REQUEST_FINISHED); |
66 | listener.transferEventReceived(event); |
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67 | } else {
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68 | if (debug)
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69 | 5262 | jaume | System.err.println("working job found ("+request.getFileName()+")"); |
70 | 5245 | jaume | request.lock(); |
71 | request.addRetrieveListener(listener); |
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72 | request.unlock(); |
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73 | } |
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74 | 5230 | jaume | |
75 | } |
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76 | 5180 | jaume | } else {
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77 | // Pick an unrepeatable fileName
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78 | String host = request.getHost();
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79 | String fileName = request.getFileName();
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80 | 5230 | jaume | File tempDir = new File(tempDirectoryPath); |
81 | if (!tempDir.exists())
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82 | tempDir.mkdir(); |
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83 | 5180 | jaume | String fileNamePrefix = tempDirectoryPath +
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84 | File.separator + host +
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85 | "-" ;
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86 | if (fileName.startsWith(fileNamePrefix))
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87 | fileName = fileName.substring(fileNamePrefix.length(), fileName.length()); |
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88 | |||
89 | 5245 | jaume | |
90 | |||
91 | |||
92 | 5230 | jaume | // get this server's task queue
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93 | RetrieveQueue serverQueue = (RetrieveQueue) getQueue(request.getHost()); |
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94 | 5180 | jaume | |
95 | 5230 | jaume | |
96 | 5180 | jaume | fileName = fileNamePrefix + fileName; |
97 | |||
98 | request.setFileName(fileName); |
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99 | 5245 | jaume | synchronized (this) { |
100 | addDownloadedURLRequest(request); |
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101 | } |
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102 | 5180 | jaume | // TODO
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103 | // jo ac? comprovaria quin protocol, m?tode, host, etc... i crearia un
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104 | // objecte que tractara la desc?rrega segons el m?tode que li toca.
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105 | // algo en plan Strategy's
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106 | //
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107 | // per exemple si fem URLRetrieveTask una abstracta i tenim
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108 | //
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109 | // GET de tota la vida
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110 | // serverQueue.put(new HTTPGetRetrieveTask(request, listener));
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111 | //
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112 | // POST
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113 | // serverQueue.put(new HTTPPostRetrieveTask(request, listener));
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114 | //
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115 | // FTP
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116 | // serverQueue.put(new FTPRetrieveTask(request, listener));
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117 | //
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118 | // ????Xarxa local?????
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119 | // serverQueue.put(new SMBRetrieveTask(request, listener));
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120 | |||
121 | // Enqueue the request and the listener will be notified when done.
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122 | 5245 | jaume | request.addRetrieveListener(listener); |
123 | URLRetrieveTask task = new URLRetrieveTask(request);
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124 | 5262 | jaume | serverQueue.put(task); |
125 | 5180 | jaume | } |
126 | } catch (MalformedURLException e) { |
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127 | e.printStackTrace(); |
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128 | } |
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129 | 5262 | jaume | return request;
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130 | 5156 | jaume | } |
131 | |||
132 | private IQueue getQueue(String hostName) { |
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133 | RetrieveQueue queue = null;
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134 | if (serversTable.containsKey(hostName))
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135 | queue = (RetrieveQueue) serversTable.get(hostName); |
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136 | else {
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137 | // crea la cola
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138 | queue = new RetrieveQueue(hostName);
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139 | // pone la cola del server en marcha.
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140 | } |
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141 | return queue;
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142 | } |
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143 | 5180 | jaume | |
144 | |||
145 | 5245 | jaume | private Vector downloadedFiles = new Vector(); |
146 | 5180 | jaume | private final String tempDirectoryPath = System.getProperty("java.io.tmpdir")+"tmp-andami"; |
147 | /**
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148 | * Remove an URL from the system cache. The file will remain in the file
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149 | * system for further eventual uses.
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150 | * @param request
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151 | */
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152 | public void removeURLRequest(URLRequest request) { |
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153 | 5245 | jaume | if (downloadedFiles != null && downloadedFiles.contains(request)) |
154 | 5180 | jaume | downloadedFiles.remove(request); |
155 | } |
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156 | /**
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157 | * Adds an URL to the table of downloaded files for further uses. If the URL
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158 | * already exists in the table its filePath value is updated to the new one and
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159 | * the old file itself is removed from the file system.
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160 | *
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161 | * @param url
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162 | * @param filePath
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163 | */
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164 | 5246 | jaume | private void addDownloadedURLRequest(URLRequest request){ |
165 | 5245 | jaume | if (!downloadedFiles.contains(request)) {
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166 | downloadedFiles.add(request); |
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167 | 5180 | jaume | } |
168 | } |
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169 | 5245 | jaume | |
170 | 5156 | jaume | } |