/**
   * iterator over the Tokens in the given ring, starting with the token for the node owning start
   * (which does not have to be a Token in the ring)
   *
   * @param includeMin True if the minimum token should be returned in the ring even if it has no
   *     owner.
   */
  public static Iterator<Token> ringIterator(
      final ArrayList<Token> ring, Token start, boolean includeMin) {
    if (ring.isEmpty())
      return includeMin
          ? Iterators.singletonIterator(StorageService.getPartitioner().getMinimumToken())
          : Iterators.<Token>emptyIterator();

    final boolean insertMin = includeMin && !ring.get(0).isMinimum();
    final int startIndex = firstTokenIndex(ring, start, insertMin);
    return new AbstractIterator<Token>() {
      int j = startIndex;

      protected Token computeNext() {
        if (j < -1) return endOfData();
        try {
          // return minimum for index == -1
          if (j == -1) return StorageService.getPartitioner().getMinimumToken();
          // return ring token for other indexes
          return ring.get(j);
        } finally {
          j++;
          if (j == ring.size()) j = insertMin ? -1 : 0;
          if (j == startIndex)
            // end iteration
            j = -2;
        }
      }
    };
  }
Exemple #2
0
 /**
  * @param path path to first element
  * @param pathTo path to second element
  * @return environment in which the generic parameters in the path to the first element are bound
  *     to those in the path to the second element, or null type on error
  */
 public static ResolvedName mapGenericParameters(
     final Deque<? extends INamedElement> path, final Deque<? extends INamedElement> pathTo) {
   // Construct an environment in which the current function's generic parameters
   // are bound to those of the eventual override.
   final Deque<List<? extends ResolvedName>> tableau =
       new LinkedList<>(ResolvedName.fromNamedElement(path.getLast()).tableau());
   final Iterator<? extends INamedElement> pathIt = path.descendingIterator();
   while (pathIt.hasNext()) {
     pathIt.next();
     tableau.removeLast();
   }
   CachedIterator<? extends INamedElement> itPathTo = null;
   CachedIterator<? extends IGenericParameter> itGPTo = null;
   boolean end = false;
   {
     // Initialise iterators into direct override's generic parameters.
     boolean foundValid = false;
     itPathTo = Iterators.cached(pathTo.iterator());
     while (!foundValid && itPathTo.hasItem()) {
       itGPTo = Iterators.cached(itPathTo.item().genericParameters().iterator());
       while (!foundValid && itGPTo.hasItem()) {
         foundValid = true;
         if (!foundValid) itGPTo.next();
       }
       if (!foundValid) itPathTo.next();
     }
     if (!foundValid) end = true;
   }
   for (final INamedElement elt : path) {
     final List<ResolvedName> row = new ArrayList<>();
     for (@SuppressWarnings("unused")
     final IGenericParameter genericParameter : elt.genericParameters()) {
       if (end) return null;
       row.add(ResolvedName.fromNamedElement(itGPTo.item()));
       {
         // Increment iterators into direct override's generic parameters.
         boolean init = true;
         boolean foundValid = false;
         if (!init) itPathTo = Iterators.cached(pathTo.iterator());
         while (!foundValid && itPathTo.hasItem()) {
           if (!init) itGPTo = Iterators.cached(itPathTo.item().genericParameters().iterator());
           while (!foundValid && itGPTo.hasItem()) {
             if (!init) foundValid = true;
             init = false;
             if (!foundValid) itGPTo.next();
           }
           if (!foundValid) itPathTo.next();
         }
         if (!foundValid) end = true;
       }
     }
     tableau.add(row);
   }
   if (!end) return null;
   return ResolvedName.newNameReference(path.getLast(), tableau);
 }
Exemple #3
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  /*
   * Get the exponentially-decayed approximate counts of values in multiple buckets. The elements in
   * the provided list denote the upper bound each of the buckets and must be sorted in ascending
   * order.
   *
   * The approximate count in each bucket is guaranteed to be within 2 * totalCount * maxError of
   * the real count.
   */
  public List<Bucket> getHistogram(List<Long> bucketUpperBounds) {
    checkArgument(
        Ordering.natural().isOrdered(bucketUpperBounds),
        "buckets must be sorted in increasing order");

    final ImmutableList.Builder<Bucket> builder = ImmutableList.builder();
    final PeekingIterator<Long> iterator = Iterators.peekingIterator(bucketUpperBounds.iterator());

    final AtomicDouble sum = new AtomicDouble();
    final AtomicDouble lastSum = new AtomicDouble();

    // for computing weighed average of values in bucket
    final AtomicDouble bucketWeightedSum = new AtomicDouble();

    final double normalizationFactor = weight(TimeUnit.NANOSECONDS.toSeconds(ticker.read()));

    postOrderTraversal(
        root,
        new Callback() {
          @Override
          public boolean process(Node node) {

            while (iterator.hasNext() && iterator.peek() <= node.getUpperBound()) {
              double bucketCount = sum.get() - lastSum.get();

              Bucket bucket =
                  new Bucket(
                      bucketCount / normalizationFactor, bucketWeightedSum.get() / bucketCount);

              builder.add(bucket);
              lastSum.set(sum.get());
              bucketWeightedSum.set(0);
              iterator.next();
            }

            bucketWeightedSum.addAndGet(node.getMiddle() * node.weightedCount);
            sum.addAndGet(node.weightedCount);
            return iterator.hasNext();
          }
        });

    while (iterator.hasNext()) {
      double bucketCount = sum.get() - lastSum.get();
      Bucket bucket =
          new Bucket(bucketCount / normalizationFactor, bucketWeightedSum.get() / bucketCount);

      builder.add(bucket);

      iterator.next();
    }

    return builder.build();
  }
Exemple #4
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  private Iterator4 checkDuplicates(CompositeIterator4 executeAllCandidates) {
    return Iterators.filter(
        executeAllCandidates,
        new Predicate4() {
          private TreeInt ids = new TreeInt(0);

          public boolean match(Object current) {
            int id = ((Integer) current).intValue();
            if (ids.find(id) != null) {
              return false;
            }
            ids = (TreeInt) ids.add(new TreeInt(id));
            return true;
          }
        });
  }
Exemple #5
0
  /**
   * Gets the values at the specified quantiles +/- maxError. The list of quantiles must be sorted
   * in increasing order, and each value must be in the range [0, 1]
   */
  public List<Long> getQuantiles(List<Double> quantiles) {
    checkArgument(
        Ordering.natural().isOrdered(quantiles), "quantiles must be sorted in increasing order");
    for (double quantile : quantiles) {
      checkArgument(quantile >= 0 && quantile <= 1, "quantile must be between [0,1]");
    }

    final ImmutableList.Builder<Long> builder = ImmutableList.builder();
    final PeekingIterator<Double> iterator = Iterators.peekingIterator(quantiles.iterator());

    postOrderTraversal(
        root,
        new Callback() {
          private double sum = 0;

          @Override
          public boolean process(Node node) {
            sum += node.weightedCount;

            while (iterator.hasNext() && sum > iterator.peek() * weightedCount) {
              iterator.next();

              // we know the max value ever seen, so cap the percentile to provide better error
              // bounds in this case
              long value = Math.min(node.getUpperBound(), max);

              builder.add(value);
            }

            return iterator.hasNext();
          }
        });

    // we finished the traversal without consuming all quantiles. This means the remaining quantiles
    // correspond to the max known value
    while (iterator.hasNext()) {
      builder.add(max);
      iterator.next();
    }

    return builder.build();
  }
  /**
   * Group files with similar min timestamp into buckets. Files with recent min timestamps are
   * grouped together into buckets designated to short timespans while files with older timestamps
   * are grouped into buckets representing longer timespans.
   *
   * @param files pairs consisting of a file and its min timestamp
   * @param timeUnit
   * @param base
   * @param now
   * @return a list of buckets of files. The list is ordered such that the files with newest
   *     timestamps come first. Each bucket is also a list of files ordered from newest to oldest.
   */
  @VisibleForTesting
  static <T> List<List<T>> getBuckets(
      Collection<Pair<T, Long>> files, long timeUnit, int base, long now) {
    // Sort files by age. Newest first.
    final List<Pair<T, Long>> sortedFiles = Lists.newArrayList(files);
    Collections.sort(
        sortedFiles,
        Collections.reverseOrder(
            new Comparator<Pair<T, Long>>() {
              public int compare(Pair<T, Long> p1, Pair<T, Long> p2) {
                return p1.right.compareTo(p2.right);
              }
            }));

    List<List<T>> buckets = Lists.newArrayList();
    Target target = getInitialTarget(now, timeUnit);
    PeekingIterator<Pair<T, Long>> it = Iterators.peekingIterator(sortedFiles.iterator());

    outerLoop:
    while (it.hasNext()) {
      while (!target.onTarget(it.peek().right)) {
        // If the file is too new for the target, skip it.
        if (target.compareToTimestamp(it.peek().right) < 0) {
          it.next();

          if (!it.hasNext()) break outerLoop;
        } else // If the file is too old for the target, switch targets.
        target = target.nextTarget(base);
      }

      List<T> bucket = Lists.newArrayList();
      while (target.onTarget(it.peek().right)) {
        bucket.add(it.next().left);

        if (!it.hasNext()) break;
      }
      buckets.add(bucket);
    }

    return buckets;
  }
  public MutationState createTable(CreateTableStatement statement, byte[][] splits)
      throws SQLException {
    PTableType tableType = statement.getTableType();
    boolean isView = tableType == PTableType.VIEW;
    if (isView && !statement.getProps().isEmpty()) {
      throw new SQLExceptionInfo.Builder(SQLExceptionCode.VIEW_WITH_TABLE_CONFIG)
          .build()
          .buildException();
    }
    connection.rollback();
    boolean wasAutoCommit = connection.getAutoCommit();
    try {
      connection.setAutoCommit(false);
      TableName tableNameNode = statement.getTableName();
      String schemaName = tableNameNode.getSchemaName();
      String tableName = tableNameNode.getTableName();

      PrimaryKeyConstraint pkConstraint = statement.getPrimaryKeyConstraint();
      String pkName = null;
      Set<String> pkColumns = Collections.<String>emptySet();
      Iterator<String> pkColumnsIterator = Iterators.emptyIterator();
      if (pkConstraint != null) {
        pkColumns = pkConstraint.getColumnNames();
        pkColumnsIterator = pkColumns.iterator();
        pkName = pkConstraint.getName();
      }

      List<ColumnDef> colDefs = statement.getColumnDefs();
      List<PColumn> columns = Lists.newArrayListWithExpectedSize(colDefs.size());
      PreparedStatement colUpsert = connection.prepareStatement(INSERT_COLUMN);
      int columnOrdinal = 0;
      Map<String, PName> familyNames = Maps.newLinkedHashMap();
      boolean isPK = false;
      for (ColumnDef colDef : colDefs) {
        if (colDef.isPK()) {
          if (isPK) {
            throw new SQLExceptionInfo.Builder(SQLExceptionCode.PRIMARY_KEY_ALREADY_EXISTS)
                .setColumnName(colDef.getColumnDefName().getColumnName().getName())
                .build()
                .buildException();
          }
          isPK = true;
        }
        PColumn column = newColumn(columnOrdinal++, colDef, pkConstraint);
        if (SchemaUtil.isPKColumn(column)) {
          // TODO: remove this constraint?
          if (!pkColumns.isEmpty()
              && !column.getName().getString().equals(pkColumnsIterator.next())) {
            throw new SQLExceptionInfo.Builder(SQLExceptionCode.PRIMARY_KEY_OUT_OF_ORDER)
                .setSchemaName(schemaName)
                .setTableName(tableName)
                .setColumnName(column.getName().getString())
                .build()
                .buildException();
          }
        }
        columns.add(column);
        if (colDef.getDataType() == PDataType.BINARY && colDefs.size() > 1) {
          throw new SQLExceptionInfo.Builder(SQLExceptionCode.BINARY_IN_ROW_KEY)
              .setSchemaName(schemaName)
              .setTableName(tableName)
              .setColumnName(column.getName().getString())
              .build()
              .buildException();
        }
        if (column.getFamilyName() != null) {
          familyNames.put(column.getFamilyName().getString(), column.getFamilyName());
        }
      }
      if (!isPK && pkColumns.isEmpty()) {
        throw new SQLExceptionInfo.Builder(SQLExceptionCode.PRIMARY_KEY_MISSING)
            .setSchemaName(schemaName)
            .setTableName(tableName)
            .build()
            .buildException();
      }

      List<Pair<byte[], Map<String, Object>>> familyPropList =
          Lists.newArrayListWithExpectedSize(familyNames.size());
      Map<String, Object> commonFamilyProps = Collections.emptyMap();
      Map<String, Object> tableProps = Collections.emptyMap();
      if (!statement.getProps().isEmpty()) {
        if (statement.isView()) {
          throw new SQLExceptionInfo.Builder(SQLExceptionCode.VIEW_WITH_PROPERTIES)
              .build()
              .buildException();
        }
        for (String familyName : statement.getProps().keySet()) {
          if (!familyName.equals(QueryConstants.ALL_FAMILY_PROPERTIES_KEY)) {
            if (familyNames.get(familyName) == null) {
              throw new SQLExceptionInfo.Builder(SQLExceptionCode.PROPERTIES_FOR_FAMILY)
                  .setFamilyName(familyName)
                  .build()
                  .buildException();
            }
          }
        }
        commonFamilyProps = Maps.newHashMapWithExpectedSize(statement.getProps().size());
        tableProps = Maps.newHashMapWithExpectedSize(statement.getProps().size());

        Collection<Pair<String, Object>> props =
            statement.getProps().get(QueryConstants.ALL_FAMILY_PROPERTIES_KEY);
        // Somewhat hacky way of determining if property is for HColumnDescriptor or
        // HTableDescriptor
        HColumnDescriptor defaultDescriptor =
            new HColumnDescriptor(QueryConstants.DEFAULT_COLUMN_FAMILY_BYTES);
        for (Pair<String, Object> prop : props) {
          if (defaultDescriptor.getValue(prop.getFirst()) != null) {
            commonFamilyProps.put(prop.getFirst(), prop.getSecond());
          } else {
            tableProps.put(prop.getFirst(), prop.getSecond());
          }
        }
      }

      for (PName familyName : familyNames.values()) {
        Collection<Pair<String, Object>> props = statement.getProps().get(familyName.getString());
        if (props.isEmpty()) {
          familyPropList.add(
              new Pair<byte[], Map<String, Object>>(familyName.getBytes(), commonFamilyProps));
        } else {
          Map<String, Object> combinedFamilyProps =
              Maps.newHashMapWithExpectedSize(props.size() + commonFamilyProps.size());
          combinedFamilyProps.putAll(commonFamilyProps);
          for (Pair<String, Object> prop : props) {
            combinedFamilyProps.put(prop.getFirst(), prop.getSecond());
          }
          familyPropList.add(
              new Pair<byte[], Map<String, Object>>(familyName.getBytes(), combinedFamilyProps));
        }
      }

      // Bootstrapping for our SYSTEM.TABLE that creates itself before it exists
      if (tableType == PTableType.SYSTEM) {
        PTable table =
            new PTableImpl(
                new PNameImpl(tableName),
                tableType,
                MetaDataProtocol.MIN_TABLE_TIMESTAMP,
                0,
                QueryConstants.SYSTEM_TABLE_PK_NAME,
                null,
                columns);
        connection.addTable(schemaName, table);
      }

      for (PColumn column : columns) {
        addColumnMutation(schemaName, tableName, column, colUpsert);
      }

      Integer saltBucketNum = (Integer) tableProps.remove(PhoenixDatabaseMetaData.SALT_BUCKETS);
      if (saltBucketNum != null
          && (saltBucketNum <= 0 || saltBucketNum > SaltingUtil.MAX_BUCKET_NUM)) {
        throw new SQLExceptionInfo.Builder(SQLExceptionCode.INVALID_BUCKET_NUM)
            .build()
            .buildException();
      }

      PreparedStatement tableUpsert = connection.prepareStatement(CREATE_TABLE);
      tableUpsert.setString(1, schemaName);
      tableUpsert.setString(2, tableName);
      tableUpsert.setString(3, tableType.getSerializedValue());
      tableUpsert.setInt(4, 0);
      tableUpsert.setInt(5, columnOrdinal);
      if (saltBucketNum != null) {
        tableUpsert.setInt(6, saltBucketNum);
      } else {
        tableUpsert.setNull(6, Types.INTEGER);
      }
      tableUpsert.setString(7, pkName);
      tableUpsert.execute();

      final List<Mutation> tableMetaData = connection.getMutationState().toMutations();
      connection.rollback();

      MetaDataMutationResult result =
          connection
              .getQueryServices()
              .createTable(tableMetaData, isView, tableProps, familyPropList, splits);
      MutationCode code = result.getMutationCode();
      switch (code) {
        case TABLE_ALREADY_EXISTS:
          connection.addTable(schemaName, result.getTable());
          if (!statement.ifNotExists()) {
            throw new TableAlreadyExistsException(schemaName, tableName);
          }
          break;
        case NEWER_TABLE_FOUND:
          // TODO: add table if in result?
          throw new NewerTableAlreadyExistsException(schemaName, tableName);
        case UNALLOWED_TABLE_MUTATION:
          throw new SQLExceptionInfo.Builder(SQLExceptionCode.CANNOT_MUTATE_TABLE)
              .setSchemaName(schemaName)
              .setTableName(tableName)
              .build()
              .buildException();
        default:
          PTable table =
              new PTableImpl(
                  new PNameImpl(tableName),
                  tableType,
                  result.getMutationTime(),
                  0,
                  pkName,
                  saltBucketNum,
                  columns);
          connection.addTable(schemaName, table);
          if (tableType == PTableType.USER) {
            connection.setAutoCommit(true);
            // Delete everything in the column. You'll still be able to do queries at earlier
            // timestamps
            Long scn = connection.getSCN();
            long ts = (scn == null ? result.getMutationTime() : scn);
            PSchema schema =
                new PSchemaImpl(
                    schemaName,
                    ImmutableMap.<String, PTable>of(table.getName().getString(), table));
            TableRef tableRef = new TableRef(null, table, schema, ts);
            byte[] emptyCF = SchemaUtil.getEmptyColumnFamily(table.getColumnFamilies());
            MutationPlan plan =
                new PostDDLCompiler(connection).compile(tableRef, emptyCF, null, ts);
            return connection.getQueryServices().updateData(plan);
          }
          break;
      }
      return new MutationState(0, connection);
    } finally {
      connection.setAutoCommit(wasAutoCommit);
    }
  }
Exemple #8
0
        @Override
        public Iterator<TitanElement> execute(final StandardElementQuery query) {
          Iterator<TitanElement> iter = null;
          if (!query.hasIndex()) {
            log.warn(
                "Query requires iterating over all vertices [{}]. For better performance, use indexes",
                query.getCondition());
            if (query.getType() == StandardElementQuery.Type.VERTEX) {
              iter = (Iterator) getVertices().iterator();
            } else if (query.getType() == StandardElementQuery.Type.EDGE) {
              iter = (Iterator) getEdges().iterator();
            } else throw new IllegalArgumentException("Unexpected type: " + query.getType());
            iter =
                Iterators.filter(
                    iter,
                    new Predicate<TitanElement>() {
                      @Override
                      public boolean apply(@Nullable TitanElement element) {
                        return query.matches(element);
                      }
                    });
          } else {
            String index = query.getIndex();
            log.debug("Answering query [{}] with index {}", query, index);
            // Filter out everything not covered by the index
            KeyCondition<TitanKey> condition = query.getCondition();
            // ASSUMPTION: query is an AND of KeyAtom
            Preconditions.checkArgument(condition instanceof KeyAnd);
            Preconditions.checkArgument(condition.hasChildren());
            List<KeyCondition<TitanKey>> newConds = Lists.newArrayList();

            boolean needsFilter = false;
            for (KeyCondition<TitanKey> c : condition.getChildren()) {
              KeyAtom<TitanKey> atom = (KeyAtom<TitanKey>) c;
              if (getGraph()
                      .getIndexInformation(index)
                      .supports(atom.getKey().getDataType(), atom.getRelation())
                  && atom.getKey().hasIndex(index, query.getType().getElementType())
                  && atom.getCondition() != null) {
                newConds.add(atom);
              } else {
                log.debug(
                    "Filtered out atom [{}] from query [{}] because it is not indexed or not covered by the index");
                needsFilter = true;
              }
            }
            Preconditions.checkArgument(
                !newConds.isEmpty(), "Invalid index assignment [%s] to query [%s]", index, query);
            final StandardElementQuery indexQuery;
            if (needsFilter) {
              Preconditions.checkArgument(
                  !newConds.isEmpty(),
                  "Query has been assigned an index [%s] in error: %s",
                  query.getIndex(),
                  query);
              indexQuery =
                  new StandardElementQuery(
                      query.getType(),
                      KeyAnd.of(newConds.toArray(new KeyAtom[newConds.size()])),
                      query.getLimit(),
                      index);
            } else {
              indexQuery = query;
            }
            try {
              iter =
                  Iterators.transform(
                      indexCache
                          .get(
                              indexQuery,
                              new Callable<List<Object>>() {
                                @Override
                                public List<Object> call() throws Exception {
                                  return graph.elementQuery(indexQuery, txHandle);
                                }
                              })
                          .iterator(),
                      new Function<Object, TitanElement>() {
                        @Nullable
                        @Override
                        public TitanElement apply(@Nullable Object id) {
                          Preconditions.checkNotNull(id);
                          if (id instanceof Long) return (TitanVertex) getVertex((Long) id);
                          else if (id instanceof RelationIdentifier)
                            return (TitanElement) getEdge((RelationIdentifier) id);
                          else throw new IllegalArgumentException("Unexpected id type: " + id);
                        }
                      });
            } catch (Exception e) {
              throw new TitanException("Could not call index", e);
            }
            if (needsFilter) {
              iter =
                  Iterators.filter(
                      iter,
                      new Predicate<TitanElement>() {
                        @Override
                        public boolean apply(@Nullable TitanElement element) {
                          return element != null
                              && !element.isRemoved()
                              && !isDeleted(query, element)
                              && query.matches(element);
                        }
                      });
            } else {
              iter =
                  Iterators.filter(
                      iter,
                      new Predicate<TitanElement>() {
                        @Override
                        public boolean apply(@Nullable TitanElement element) {
                          return element != null
                              && !element.isRemoved()
                              && !isDeleted(query, element);
                        }
                      });
            }
          }
          return iter;
        }
Exemple #9
0
        @Override
        public Iterator<TitanElement> getNew(final StandardElementQuery query) {
          Preconditions.checkArgument(
              query.getType() == StandardElementQuery.Type.VERTEX
                  || query.getType() == StandardElementQuery.Type.EDGE);
          if (query.getType() == StandardElementQuery.Type.VERTEX && hasModifications()) {
            // Collect all keys from the query - ASSUMPTION: query is an AND of KeyAtom
            final Set<TitanKey> keys = Sets.newHashSet();
            KeyAtom<TitanKey> standardIndexKey = null;
            for (KeyCondition<TitanKey> cond : query.getCondition().getChildren()) {
              KeyAtom<TitanKey> atom = (KeyAtom<TitanKey>) cond;
              if (atom.getRelation() == Cmp.EQUAL && isVertexIndexProperty(atom.getKey()))
                standardIndexKey = atom;
              keys.add(atom.getKey());
            }
            Iterator<TitanVertex> vertices;
            if (standardIndexKey == null) {
              Set<TitanVertex> vertexSet = Sets.newHashSet();
              for (TitanRelation r :
                  addedRelations.getView(
                      new Predicate<InternalRelation>() {
                        @Override
                        public boolean apply(@Nullable InternalRelation relation) {
                          return keys.contains(relation.getType());
                        }
                      })) {
                vertexSet.add(((TitanProperty) r).getVertex());
              }
              for (TitanRelation r : deletedRelations.values()) {
                if (keys.contains(r.getType())) {
                  TitanVertex v = ((TitanProperty) r).getVertex();
                  if (!v.isRemoved()) vertexSet.add(v);
                }
              }
              vertices = vertexSet.iterator();
            } else {
              vertices =
                  Iterators.transform(
                      newVertexIndexEntries
                          .get(standardIndexKey.getCondition(), standardIndexKey.getKey())
                          .iterator(),
                      new Function<TitanProperty, TitanVertex>() {
                        @Nullable
                        @Override
                        public TitanVertex apply(@Nullable TitanProperty o) {
                          return o.getVertex();
                        }
                      });
            }

            return (Iterator)
                Iterators.filter(
                    vertices,
                    new Predicate<TitanVertex>() {
                      @Override
                      public boolean apply(@Nullable TitanVertex vertex) {
                        return query.matches(vertex);
                      }
                    });
          } else if (query.getType() == StandardElementQuery.Type.EDGE
              && !addedRelations.isEmpty()) {
            return (Iterator)
                addedRelations
                    .getView(
                        new Predicate<InternalRelation>() {
                          @Override
                          public boolean apply(@Nullable InternalRelation relation) {
                            return (relation instanceof TitanEdge)
                                && !relation.isHidden()
                                && query.matches(relation);
                          }
                        })
                    .iterator();
          } else throw new IllegalArgumentException("Unexpected type: " + query.getType());
        }
Exemple #10
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        @Override
        public Iterator<TitanRelation> execute(final VertexCentricQuery query) {
          if (query.getVertex().isNew()) return Iterators.emptyIterator();

          final EdgeSerializer edgeSerializer = graph.getEdgeSerializer();
          FittedSliceQuery sq = edgeSerializer.getQuery(query);
          final boolean fittedQuery = sq.isFitted();
          final InternalVertex v = query.getVertex();
          final boolean needsFiltering = !sq.isFitted() || !deletedRelations.isEmpty();
          if (needsFiltering && sq.hasLimit())
            sq = new FittedSliceQuery(sq, QueryUtil.updateLimit(sq.getLimit(), 1.1));

          Iterable<TitanRelation> result = null;
          double limitMultiplier = 1.0;
          int previousDiskSize = 0;
          boolean finished;
          do {
            finished = true;
            Iterable<Entry> iter = null;

            if (v instanceof CacheVertex) {
              CacheVertex cv = (CacheVertex) v;
              iter =
                  ((CacheVertex) v)
                      .loadRelations(
                          sq,
                          new Retriever<SliceQuery, List<Entry>>() {
                            @Override
                            public List<Entry> get(SliceQuery query) {
                              return graph.edgeQuery(v.getID(), query, txHandle);
                            }
                          });
            } else {
              iter = graph.edgeQuery(v.getID(), sq, txHandle);
            }
            result =
                Iterables.transform(
                    iter,
                    new Function<Entry, TitanRelation>() {
                      @Nullable
                      @Override
                      public TitanRelation apply(@Nullable Entry entry) {
                        return edgeSerializer.readRelation(v, entry);
                      }
                    });
            if (needsFiltering) {
              result =
                  Iterables.filter(
                      result,
                      new Predicate<TitanRelation>() {
                        @Override
                        public boolean apply(@Nullable TitanRelation relation) {
                          // Filter out updated and deleted relations
                          return (relation == ((InternalRelation) relation).it()
                                  && !deletedRelations.containsKey(Long.valueOf(relation.getID())))
                              && (fittedQuery || query.matches(relation));
                        }
                      });
            }
            // Determine termination
            if (needsFiltering && query.hasLimit()) {
              if (!IterablesUtil.sizeLargerOrEqualThan(result, query.getLimit())) {
                int currentDiskSize = IterablesUtil.size(iter);
                if (currentDiskSize > previousDiskSize) {
                  finished = false;
                  previousDiskSize = currentDiskSize;
                  limitMultiplier *= 2;
                  sq =
                      new FittedSliceQuery(
                          sq, QueryUtil.updateLimit(sq.getLimit(), limitMultiplier));
                }
              }
            }
          } while (!finished);

          return result.iterator();
        }
 @Override
 public UnmodifiableIterator<DocumentMapper> iterator() {
   return Iterators.unmodifiableIterator(mappers.values().iterator());
 }