Exemplo n.º 1
0
  /**
   * If the given name already denotes a file, this opens it; otherwise, this creates a new empty
   * file. A null name produces a temporary heap file which requires no DB entry.
   */
  public HeapFile(String name) throws ChainException {
    this.name = name;
    PageId firstPageId;
    Page page = new Page();
    pages = new ArrayList<PageId>();
    pids = new HashSet<Integer>();
    if (name == null) {
      // Temporary heap file
      firstPageId = global.Minibase.BufferManager.newPage(page, 1);
      current = new HFPage(page);
      current.setCurPage(firstPageId);
      pages.add(firstPageId);
      pids.add(firstPageId.pid);
      global.Minibase.BufferManager.unpinPage(firstPageId, true);
    } else {

      firstPageId = global.Minibase.DiskManager.get_file_entry(name);
      if (firstPageId == null) {
        firstPageId = global.Minibase.BufferManager.newPage(page, 1);
        global.Minibase.DiskManager.add_file_entry(name, firstPageId);
        global.Minibase.BufferManager.unpinPage(firstPageId, true);
        pages.add(firstPageId);
        pids.add(firstPageId.pid);
        global.Minibase.BufferManager.pinPage(firstPageId, page, false);

        recordNumber = 0;
        current = new HFPage(page);
        current.setCurPage(firstPageId);
        global.Minibase.BufferManager.unpinPage(firstPageId, true);
        return;
      }
      // add the new HFPages
      global.Minibase.BufferManager.pinPage(firstPageId, page, false);
      // System.err.println("hahahaha"+page.getData());
      current = new HFPage(page);
      current.setData(page.getData());
      pages.add(firstPageId);
      pids.add(firstPageId.pid);
      recordNumber += amount(current);
      global.Minibase.BufferManager.unpinPage(firstPageId, false);
      PageId currentPageId = current.getNextPage();
      while (currentPageId.pid != 0 & currentPageId.pid != -1) {
        HFPage temp = new HFPage();
        global.Minibase.BufferManager.pinPage(currentPageId, temp, false);
        pages.add(currentPageId);
        pids.add(currentPageId.pid);
        recordNumber += amount(temp);
        global.Minibase.BufferManager.unpinPage(currentPageId, false);
        currentPageId = temp.getNextPage();
      }
    }
  }
Exemplo n.º 2
0
  /**
   * Deletes the heap file from the database, freeing all of its pages.
   *
   * @throws ChainException
   */
  public void deleteFile() throws ChainException {
    if (delete) throw new ChainException(null, "files have already been deleted");

    for (int i = 0; i < pages.size(); i++)
      try {
        global.Minibase.DiskManager.deallocate_page(pages.get(i));
      } catch (Exception e) {
        throw new ChainException(null, "fail to deallocate page");
      }
    global.Minibase.DiskManager.delete_file_entry(name);
    pages = null;
    pids = null;
    recordNumber = 0;
    delete = true;
  }