Examples of uk.ac.open.kmi.smartproducts.sesame.sail.btree.BTree


  public SortedRecordCache(File cacheDir, int recordSize, long maxRecords, RecordComparator comparator)
    throws IOException
  {
    super(maxRecords);
    btree = new BTree(cacheDir, "txncache", 4096, recordSize, comparator);
  }


      for (String fieldSeq : addedIndexSpecs) {
        logger.debug("Initializing new index '{}'...", fieldSeq);


        TripleIndex addedIndex = new TripleIndex(fieldSeq);
        BTree addedBTree = addedIndex.getBTree();


        RecordIterator sourceIter = sourceIndex.getBTree().iterateAll();
        try {
          byte[] value = null;
          while ((value = sourceIter.next()) != null) {
            addedBTree.insert(value);
          }
        }
        finally {
          sourceIter.close();
        }


  protected double cardinality(int subj, int pred, int obj, int context)
    throws IOException
  {
    TripleIndex index = getBestIndex(subj, pred, obj, context);
    BTree btree = index.btree;


    double rangeSize;


    if (index.getPatternScore(subj, pred, obj, context) == 0) {
      rangeSize = btree.getValueCountEstimate();
    }
    else {
      byte[] minValue = getMinValue(subj, pred, obj, context);
      byte[] maxValue = getMaxValue(subj, pred, obj, context);
      rangeSize = btree.getValueCountEstimate(minValue, maxValue);
    }


    return rangeSize;
  }

      count = (int)removedTriplesCache.getRecordCount();
      updatedTriplesCache.storeRecords(removedTriplesCache);


      // Set the REMOVED flag by overwriting the affected records
      for (TripleIndex index : indexes) {
        BTree btree = index.getBTree();


        RecordIterator recIter = removedTriplesCache.getRecords();
        try {
          while ((data = recIter.next()) != null) {
            btree.insert(data);
          }
        }
        finally {
          recIter.close();
        }


    // updatedTriplesCache will be null when recovering from a crashed commit
    boolean validCache = updatedTriplesCache != null && updatedTriplesCache.isValid();


    for (TripleIndex index : indexes) {
      BTree btree = index.getBTree();


      RecordIterator iter;
      if (validCache) {
        // Use the cached set of updated triples
        iter = updatedTriplesCache.getRecords();
      }
      else {
        // Cache is invalid; too much updates(?). Iterate over all triples
        iter = btree.iterateAll();
      }


      try {
        byte[] data;
        while ((data = iter.next()) != null) {
          byte flags = data[FLAG_IDX];
          boolean wasAdded = (flags & ADDED_FLAG) != 0;
          boolean wasRemoved = (flags & REMOVED_FLAG) != 0;
          boolean wasToggled = (flags & TOGGLE_EXPLICIT_FLAG) != 0;


          if (wasRemoved) {
            btree.remove(data);
          }
          else if (wasAdded || wasToggled) {
            if (wasToggled) {
              data[FLAG_IDX] ^= EXPLICIT_FLAG;
            }
            if (wasAdded) {
              data[FLAG_IDX] ^= ADDED_FLAG;
            }


            if (validCache) {
              // We're iterating the cache
              btree.insert(data);
            }
            else {
              // We're iterating the BTree itself
              iter.set(data);
            }

  private void checkAllCommitted()
    throws IOException
  {
    for (TripleIndex index : indexes) {
      System.out.println("Checking " + index + " index");
      BTree btree = index.getBTree();
      RecordIterator iter = btree.iterateAll();
      try {
        for (byte[] data = iter.next(); data != null; data = iter.next()) {
          byte flags = data[FLAG_IDX];
          boolean wasAdded = (flags & ADDED_FLAG) != 0;
          boolean wasRemoved = (flags & REMOVED_FLAG) != 0;

    boolean validCache = updatedTriplesCache != null && updatedTriplesCache.isValid();


    byte txnFlagsMask = ~(ADDED_FLAG | REMOVED_FLAG | TOGGLE_EXPLICIT_FLAG);


    for (TripleIndex index : indexes) {
      BTree btree = index.getBTree();


      RecordIterator iter;
      if (validCache) {
        // Use the cached set of updated triples
        iter = updatedTriplesCache.getRecords();
      }
      else {
        // Cache is invalid; too much updates(?). Iterate over all triples
        iter = btree.iterateAll();
      }


      try {
        byte[] data = null;
        while ((data = iter.next()) != null) {
          byte flags = data[FLAG_IDX];
          boolean wasAdded = (flags & ADDED_FLAG) != 0;
          boolean wasRemoved = (flags & REMOVED_FLAG) != 0;
          boolean wasToggled = (flags & TOGGLE_EXPLICIT_FLAG) != 0;


          if (wasAdded) {
            btree.remove(data);
          }
          else {
            if (wasRemoved || wasToggled) {
              data[FLAG_IDX] &= txnFlagsMask;


              if (validCache) {
                // We're iterating the cache
                btree.insert(data);
              }
              else {
                // We're iterating the BTree itself
                iter.set(data);
              }


    public TripleIndex(String fieldSeq)
      throws IOException
    {
      tripleComparator = new TripleComparator(fieldSeq);
      btree = new BTree(dir, getFilenamePrefix(fieldSeq), 2048, RECORD_LENGTH, tripleComparator, forceSync);
    }

Examples of uk.ac.open.kmi.smartproducts.sesame.sail.btree.BTree

Related Classes of uk.ac.open.kmi.smartproducts.sesame.sail.btree.BTree