/**
 * A set of DownloadMonitors, at various priority levels, for parsing various types of Documents.
 *
 * @author andruid
 */
public class SemanticsDownloadMonitors extends Debug {
  protected ArrayList<DownloadMonitor> downloadMonitors = new ArrayList<DownloadMonitor>();

  public static final int REGULAR_DOCUMENT_DOWNLOAD_MONITOR = 0;

  /**
   * This is the <code>DownloadMonitor</code> used by to process drag and drop operations. It gets
   * especially high priority, in order to provide rapid response to the user.
   */
  public static final int DND_DOCUMENT_DOWNLOAD_MONITOR = 1;

  /** This is the <code>DownloadMonitor</code> used by seeds. It never gets paused. */
  public static final int SEEDING_DOCUMENT_DOWNLOAD_MONITOR = 2;

  public static final int REGULAR_IMAGE_DOWNLOAD_MONITOR = 3;

  public static final int DND_IMAGE_DOWNLOAD_MONITOR = 4;

  public static final int NUM_DOWNLOAD_MONITORS = DND_IMAGE_DOWNLOAD_MONITOR + 1;

  private static final DownloadMonitor<DocumentClosure>[] DOWNLOAD_MONITORS =
      new DownloadMonitor[NUM_DOWNLOAD_MONITORS];

  public static final SimpleDownloadProcessor<DocumentClosure> ASSETS_DOWNLOAD_PROCESSOR =
      new SimpleDownloadProcessor<DocumentClosure>();

  static final int NUM_CRAWLER_DOWNLOAD_THREADS =
      Pref.lookupInt("num_crawler_download_threads", 10);

  static final int NUM_SEEDING_DOWNLOAD_THREADS = 4;

  static final int NUM_IMAGE_DOWNLOAD_THREADS = 2;

  static final int DND_PRIORITY_BOOST = 6;

  static {
    DOWNLOAD_MONITORS[REGULAR_DOCUMENT_DOWNLOAD_MONITOR] =
        new DownloadMonitor<DocumentClosure>("Documents Regular", NUM_CRAWLER_DOWNLOAD_THREADS, 0);

    DOWNLOAD_MONITORS[DND_DOCUMENT_DOWNLOAD_MONITOR] =
        new DownloadMonitor<DocumentClosure>(
            "Documents Highest Priority", NUM_SEEDING_DOWNLOAD_THREADS, DND_PRIORITY_BOOST);

    DOWNLOAD_MONITORS[SEEDING_DOCUMENT_DOWNLOAD_MONITOR] =
        new DownloadMonitor<DocumentClosure>("Documents Seeding", NUM_SEEDING_DOWNLOAD_THREADS, 1);

    DOWNLOAD_MONITORS[REGULAR_IMAGE_DOWNLOAD_MONITOR] =
        new DownloadMonitor<DocumentClosure>("Images Regular", NUM_IMAGE_DOWNLOAD_THREADS, 1);

    DOWNLOAD_MONITORS[DND_IMAGE_DOWNLOAD_MONITOR] =
        new DownloadMonitor<DocumentClosure>(
            "Images High Priority", NUM_IMAGE_DOWNLOAD_THREADS, DND_PRIORITY_BOOST);
  };

  /** */
  public SemanticsDownloadMonitors() {
    // FIXME -- why do we do this??? i think its wrong -- andruid 7/1/2011
    DOWNLOAD_MONITORS[REGULAR_DOCUMENT_DOWNLOAD_MONITOR].setHurry(true);
  }

  /**
   * Pause the regular crawler Document DownloadMonitor.
   *
   * @param pause
   */
  public void pauseRegular(boolean pause) {
    pause(REGULAR_DOCUMENT_DOWNLOAD_MONITOR, pause);
  }

  /**
   * Pause all DownloadMonitors and wait until all the ongoing parsing is done. After this we can
   * expect that all the metadata objects downloaded will not change due to downloading and parsing.
   *
   * @param pause
   */
  public void pauseAllAndWaitUntilNonePending(boolean pause) {
    // there has to be two loops, because we want to first request pause for every DownloadMonitor
    // so that no new closures are processed, and then wait for them to finish their ongoing jobs.
    // if we merge the two, we may wait for a longer time because some closures get processed
    // when we are waiting on another DownloadMonitor to finish its ongoing job.
    for (DownloadMonitor<DocumentClosure> downloadMonitor : DOWNLOAD_MONITORS) {
      downloadMonitor.pause(pause);
    }
    for (DownloadMonitor<DocumentClosure> downloadMonitor : DOWNLOAD_MONITORS) {
      downloadMonitor.waitUntilNonePending();
    }
  }

  /**
   * Pause a particular DownloadMonitor.
   *
   * @param whichMonitor
   * @param pause
   */
  void pause(int whichMonitor, boolean pause) {
    DownloadMonitor<DocumentClosure> downloadMonitor = DOWNLOAD_MONITORS[whichMonitor];
    if (pause) downloadMonitor.pause();
    else downloadMonitor.unpause();
  }

  /** @return true if there are there are Downloadables enqueued in the Seeding DownloadMonitor. */
  public boolean seedsArePending() {
    return DOWNLOAD_MONITORS[SEEDING_DOCUMENT_DOWNLOAD_MONITOR].toDownloadSize() > 0;
  }

  /**
   * Get the DownloadMonitor that is appropriate for the Document and context at hand.
   *
   * @param isImage
   * @param isDnd
   * @param isSeed
   * @param isGui
   * @return Appropriate DownloadMonitor, based on the input parameters.
   */
  public DownloadProcessor<DocumentClosure> downloadProcessor(
      boolean isImage, boolean isDnd, boolean isSeed, boolean isGui) {
    DownloadProcessor<DocumentClosure> result;
    if (isGui) result = ASSETS_DOWNLOAD_PROCESSOR;
    else {
      int downloadMonitorIndex =
          isImage
              ? (isDnd ? DND_IMAGE_DOWNLOAD_MONITOR : REGULAR_IMAGE_DOWNLOAD_MONITOR)
              : (isDnd
                  ? DND_DOCUMENT_DOWNLOAD_MONITOR
                  : isSeed ? SEEDING_DOCUMENT_DOWNLOAD_MONITOR : REGULAR_DOCUMENT_DOWNLOAD_MONITOR);
      result = DOWNLOAD_MONITORS[downloadMonitorIndex];
    }
    return result;
  }

  /**
   * Stop all the DownloadMonitors.
   *
   * @param kill
   */
  public void stop(boolean kill) {
    for (DownloadMonitor<DocumentClosure> downloadMonitor : DOWNLOAD_MONITORS)
      downloadMonitor.stop(kill);
  }

  /** Ask all the DownloadMonitors to stop when they have exhausted their queues. */
  public void requestStops() {
    for (DownloadMonitor<DocumentClosure> downloadMonitor : DOWNLOAD_MONITORS)
      downloadMonitor.requestStop();
  }
  /** Pause regular DownloadMonitors for documents and images. */
  public void pauseRegularDownloadMonitors() {
    DOWNLOAD_MONITORS[REGULAR_DOCUMENT_DOWNLOAD_MONITOR].pause();
    DOWNLOAD_MONITORS[REGULAR_IMAGE_DOWNLOAD_MONITOR].pause();
  }
  /** Unpause regular DownloadMonitors for documents and images. */
  public void unpauseRegularDownloadMonitors() {
    DOWNLOAD_MONITORS[REGULAR_DOCUMENT_DOWNLOAD_MONITOR].unpause();
    DOWNLOAD_MONITORS[REGULAR_IMAGE_DOWNLOAD_MONITOR].unpause();
  }

  public void unpauseAll() {
    for (DownloadMonitor<DocumentClosure> downloadMonitor : DOWNLOAD_MONITORS) {
      downloadMonitor.unpause();
    }
  }

  /**
   * The regular DownloadMonitor for operating on Images.
   *
   * @return
   */
  public static DownloadMonitor<DocumentClosure> regularImageDownloadMonitor() {
    return DOWNLOAD_MONITORS[REGULAR_IMAGE_DOWNLOAD_MONITOR];
  }

  public void killSite(BasicSite site) {
    for (DownloadMonitor<DocumentClosure> downloadMonitor : DOWNLOAD_MONITORS)
      downloadMonitor.removeAllDownloadClosuresFromSite(site);
  }
}
示例#2
0
 public Prologue() {
   super();
   this.userID = Pref.lookupString("uid", "0");
   this.questionId = Pref.lookupString("questionId");
   this.studyName = Pref.lookupString("study_name");
 }