Examples of javax.jnlp.DownloadService

javax.jnlp.DownloadService
This is just an empty implementation of DownloadService. It does define only the methods of the JNLP API used in the class org.nasutekds.quicksetup.webstart.WebstartDownloader. We have chosen to do this because we we require the JNLP API to be compiled but the location of the javaws.jar depends on the java distribution, so instead of trying to figure out where javaws.jar is on the java distribution that is being used to compile the source, we just add these classes to the build-tools.jar file that will be used to compile que QuickSetup. It must be noted that the class org.nasutekds.quicksetup.webstart.WebstartDownloader will be only executed in the context of a Java Web Start application and that in this case the javaws.jar will be provided by the Java Web Start Runtime environment. So we are not providing the javaws-stub.jar during runtime: it is used only for compilation.

public class SweetHome3DJavaWebStartBootstrap {
  public static void main(String [] args) throws ClassNotFoundException, 
        NoSuchMethodException, IllegalAccessException, InvocationTargetException {
    try { 
      // Lookup the javax.jnlp.DownloadService object 
      DownloadService service = (DownloadService)ServiceManager.lookup("javax.jnlp.DownloadService");
      DownloadServiceListener progressWindow = service.getDefaultProgressWindow();
      // Search jars lazily downloaded 
      String lazyParts = System.getProperty("com.eteks.sweethome3d.lazyParts", "");
      List<String> lazyPartsToDownload = new ArrayList<String>(); 
      for (String lazyPart : lazyParts.split("\\s")) {
        if (!service.isPartCached(lazyPart)) {
          lazyPartsToDownload.add(lazyPart);
        }
      }      
      try {
        if (lazyPartsToDownload.size() > 0) {
          service.loadPart(lazyPartsToDownload.toArray(new String [lazyPartsToDownload.size()]), progressWindow);
        }
      } catch (IOException ex) {
        ex.printStackTrace();
        System.exit(1);
      }

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  return true;
    }
    
    /** Remove data component data JAR from cache */
    static public void removeInstallerComponent() {
  DownloadService downloadService = Config.getDownloadService();
  if (downloadService != null) {
      String component = Config.getInstallerLocation();
      String version   = Config.getInstallerVersion();
      try {
    URL codebase = Config.getBasicService().getCodeBase();
    URL url = new URL(codebase, component);
    component = url.toString();
    Config.trace("Removing: " + component + "/" + version);
    downloadService.removeResource(url, version);
      } catch(IOException ioe) {
    Config.trace("Unable to remove " + component + "/" + version);
      }
  } else {
      Config.trace("No download service found");

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   * @throws ApplicationException if the download service is not available.
   */
  private void startDownload(boolean forceDownload)
      throws IOException, ApplicationException
  {
    DownloadService ds;
    try
    {
      ds =
          (DownloadService) ServiceManager.lookup(Utils.JNLP_SERVICE_NAME);
    } catch (UnavailableServiceException e)
    {
      LOG.log(Level.SEVERE, "Could not find service: "+
          Utils.JNLP_SERVICE_NAME, e);
      String setupFile;
      if (Utils.isWindows())
      {
        setupFile = Installation.WINDOWS_SETUP_FILE_NAME;
      }
      else
      {
        setupFile = Installation.UNIX_SETUP_FILE_NAME;
      }
      throw new ApplicationException(
        ReturnCode.DOWNLOAD_ERROR,
        getThrowableMsg(INFO_DOWNLOADING_ERROR_NO_SERVICE_FOUND.get(
            Utils.JNLP_SERVICE_NAME, setupFile),
            e), e);
    }


    String[] urls = getJarUrls();
    String[] versions = getJarVersions();


    /*
     * Calculate the percentages that correspond to each file.
     * TODO ideally this should be done dynamically, but as this is just
     * to provide progress, updating this information from time to time can
     * be enough and does not complexify the build process.
     */
    int[] percentageMax = new int[urls.length];
    int[] ratios = new int[urls.length];
    int totalRatios = 0;
    for (int i=0; i<percentageMax.length; i++)
    {
      int ratio;
      if (urls[i].endsWith("NasuTekDS.jar"))
      {
        ratio =  23;
      }
      else if (urls[i].endsWith("je.jar"))
      {
        ratio = 11;
      }
      else if (urls[i].endsWith("zipped.jar"))
      {
        ratio = 110;
      }
      else if (urls[i].endsWith("aspectjrt.jar"))
      {
        ratio = 10;
      }
      else
      {
        ratio = (100 / urls.length);
      }
      ratios[i] = ratio;
      totalRatios += ratio;
    }


    for (int i=0; i<percentageMax.length; i++)
    {
      int r = 0;
      for (int j=0; j<=i; j++)
      {
        r += ratios[j];
      }
      percentageMax[i] = (100 * r)/totalRatios;
    }




    for (int i = 0; i < urls.length && (getException() == null); i++)
    {
      if (i == 0)
      {
        currentPercMin = 0;
      }
      else {
        currentPercMin = percentageMax[i-1];
      }
      currentPercMax = percentageMax[i];


      // determine if a particular resource is cached
      String sUrl = urls[i];
      String version = versions[i];


      URL url = new URL(sUrl);
      boolean cached = ds.isResourceCached(url, version);


      if (cached && forceDownload)
      {
        try
        {
          ds.removeResource(url, version);
        } catch (IOException ioe)
        {
        }
        cached = false;
      }


      if (!cached)
      {
        // if not in the cache load the resource into the cache
        ds.loadResource(url, version, this);
      }
      downloadPercentage = currentPercMax;
    }
    isFinished = true;
  }

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Related Classes of javax.jnlp.DownloadService

com.eteks.sweethome3d.SweetHome3DJavaWebStartBootstrap

jnlp.sample.JreInstaller.Main

org.nasutekds.quicksetup.webstart.WebStartDownloader

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