Examples of lupos.datastructures.buffermanager.PageManager

Package lupos.datastructures.buffermanager

Examples of lupos.datastructures.buffermanager.PageManager

lupos.datastructures.buffermanager.PageManager
This class manages the free pages in a file. The first page is reserved for storing the free pages before the end of the file. Each page has the following format: Bytes 0 - 3 for the next page of a sequence of pages Bytes 4 and 5 for the maximum number of bytes within this page The Page 0 has a special semantic: Bytes 6 to 9 of page 0 store the current total number of pages. Byte 10 of page 0 stores if free pages are only in the end (and new pages must be appended) (value=0), or if page 0 stores some free pages (value=1), which should be used for the new pages... Afterwards page 0 (and maybe its following sequence) stores the free pages.


  private final Triple<V, Long, Long> getElement(final long address) {
    final int pagenumber = (int) (address / PageManager.getDefaultPageSize());
    final int index = (int) (address % PageManager.getDefaultPageSize());
    try {
      final InputStream in = new ContinousPagesInputStream(pagenumber, new PageManager(this.valuesFilename, false, false), index);
      final long numberOfElements = InputHelper.readLuposLong(in);
      final long addressOfNextElement = InputHelper.readLuposLong(in);
      final V element = Registration.deserializeWithoutId(this.classOfValues, in);
      in.close();
      return new Triple<V, Long, Long>(element, numberOfElements, addressOfNextElement);

View Full Code Here

      final File f = new File(DBBPTree.mainFolder);
      f.mkdirs();
      if(this.currentID==0){
        FileHelper.deleteFilesStartingWithPattern(DBBPTree.mainFolder, this.currentID + ".dbbptree_");
      }
      this.pageManager = new PageManager(DBBPTree.mainFolder + this.currentID + ".dbbptree");
    } finally {
      lock.unlock();
    }


    if (comparator == null) {

View Full Code Here

    FileHelper.deleteFile(DBBPTree.mainFolder+this.currentID+ ".dbbptree_*");
    final File f = new File(DBBPTree.mainFolder);
    f.mkdirs();
    try {
      this.pageManager.close();
      this.pageManager = new PageManager(DBBPTree.mainFolder + this.currentID
          + ".dbbptree");
    } catch (final IOException e) {
      System.err.println(e);
      e.printStackTrace();
    }

View Full Code Here

    this.firstLeafPage = firstLeafFileName;
    this.keyClass = keyClass;
    this.valueClass = valueClass;
    this.currentID = currentID;
    this.nodeDeSerializer = nodeDeSerializer;
    this.pageManager = new PageManager(DBBPTree.mainFolder + currentID + ".dbbptree", false);
  }

View Full Code Here

   * @param pageSize
   *            The number of bytes in a page to be stored on disk
   * @throws IOException
   */
  public NodeManager(final Trie trie, final String fileName, final int bufferSize, final int pageSize) throws IOException {
    this.pageManager = new PageManager(fileName, pageSize);


    // If the given file contains data at page 1, it can be assumed that the
    // root node of a trie is stored on that page
    if (!this.isEmpty(1)){
      this.pageManager.initAfterLoading();

View Full Code Here

   * @param filename the filename under which this collection is stored!
   * @throws IOException
   */
  public PagedCollection(final String filename, final Class<? extends E> classname) throws IOException {
    this.filename = filename;
    this.pageManager = new PageManager(this.filename, false);
    final byte[] page = this.pageManager.getPage(0);
    final InputStream in = new ByteArrayInputStream(page, 0, 12);
    this.size = InputHelper.readLuposInteger(in);
    this.endOfCollection = InputHelper.readLuposLong(in);
    in.close();

View Full Code Here

0 1 2

TOP

Related Classes of lupos.datastructures.buffermanager.PageManager

lupos.datastructures.buffermanager.BufferManager.PageAddress

lupos.datastructures.paged_dbbptree.DBBPTree

lupos.datastructures.paged_map.PagedHashMultiMap

lupos.datastructures.paged_set.PagedHashMultiSet

lupos.datastructures.patriciatrie.disk.nodemanager.NodeManager

lupos.datastructures.smallerinmemorylargerondisk.PagedCollection

java.io.File

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.