Clear the processing buffer and update state.

Main.java

private static ProcessingListener finishListener = new ProcessingListener() {

  @Override
  public void onProcessFinished(int bufferId, HashSet urls,
    int numScraped) {

    // updates list of duplicate urls
    synchronized(this) {
      duplicateUrls = urls;
    }

    // prints results to screen
    numVinesScraped += numScraped;
    if (numScraped != 0) {
      System.out.println(“Scraped“ + numScraped + “vine(s) from buffer” + bufferId + “.Total vines is now“ + numVinesScraped + “.”);
    }

    // clears buffer and resets processing state
    switch (bufferId) {
      case 1:
        buffer1.clearBuffer();
        buffer1.setProcessing(false);
        break;
      case 2:
        buffer2.clearBuffer();
        buffer2.setProcessing(false);
        break;
    }

    // stops scraping when threshold is reached
    if (numVinesScraped >= NUM_VINES_TO_DOWNLOAD &&
       (NUM_VINES_TO_DOWNLOAD != -1)) {
      twitter.cleanUp();
      twitter.shutdown();
    }
  }
};