Examples with Interval com.thinkaurelius.titan.util.datastructures.Interval used on opensource projects

Example 1 with Interval

use of com.thinkaurelius.titan.util.datastructures.Interval in project titan by thinkaurelius.

the class BasicVertexCentricQueryBuilder method compileConstraints.

/**
     * Converts the constraint conditions of this query into a constraintMap which is passed as an argument.
     * If all the constraint conditions could be accounted for in the constraintMap, this method returns true, else -
     * if some constraints cannot be captured in an interval - it returns false to indicate that further in-memory filtering
     * will be necessary.
     * </p>
     * This constraint map is used in constructing the SliceQueries and query optimization since this representation
     * is easier to handle.
     *
     * @param conditions
     * @param constraintMap
     * @return
     */
private boolean compileConstraints(And<TitanRelation> conditions, Map<RelationType, Interval> constraintMap) {
    boolean isFitted = true;
    for (Condition<TitanRelation> condition : conditions.getChildren()) {
        RelationType type = null;
        Interval newInterval = null;
        if (condition instanceof Or) {
            Map.Entry<RelationType, Collection> orEqual = QueryUtil.extractOrCondition((Or) condition);
            if (orEqual != null) {
                type = orEqual.getKey();
                newInterval = new PointInterval(orEqual.getValue());
            }
        } else if (condition instanceof PredicateCondition) {
            PredicateCondition<RelationType, TitanRelation> atom = (PredicateCondition) condition;
            type = atom.getKey();
            Interval interval = constraintMap.get(type);
            newInterval = intersectConstraints(interval, type, atom.getPredicate(), atom.getValue());
        }
        if (newInterval != null) {
            constraintMap.put(type, newInterval);
        } else
            isFitted = false;
    }
    if (adjacentVertex != null) {
        if (adjacentVertex.hasId())
            constraintMap.put(ImplicitKey.ADJACENT_ID, new PointInterval(adjacentVertex.longId()));
        else
            isFitted = false;
    }
    return isFitted;
}

Example 2 with Interval

use of com.thinkaurelius.titan.util.datastructures.Interval in project titan by thinkaurelius.

the class EdgeSerializer method getQuery.

public SliceQuery getQuery(InternalRelationType type, Direction dir, TypedInterval[] sortKey) {
    Preconditions.checkNotNull(type);
    Preconditions.checkNotNull(dir);
    Preconditions.checkArgument(type.isUnidirected(Direction.BOTH) || type.isUnidirected(dir));
    StaticBuffer sliceStart = null, sliceEnd = null;
    RelationCategory rt = type.isPropertyKey() ? RelationCategory.PROPERTY : RelationCategory.EDGE;
    if (dir == Direction.BOTH) {
        assert type.isEdgeLabel();
        sliceStart = IDHandler.getRelationType(type.longId(), getDirID(Direction.OUT, rt), type.isInvisibleType());
        sliceEnd = IDHandler.getRelationType(type.longId(), getDirID(Direction.IN, rt), type.isInvisibleType());
        assert sliceStart.compareTo(sliceEnd) < 0;
        sliceEnd = BufferUtil.nextBiggerBuffer(sliceEnd);
    } else {
        DirectionID dirID = getDirID(dir, rt);
        DataOutput colStart = serializer.getDataOutput(DEFAULT_COLUMN_CAPACITY);
        DataOutput colEnd = serializer.getDataOutput(DEFAULT_COLUMN_CAPACITY);
        IDHandler.writeRelationType(colStart, type.longId(), dirID, type.isInvisibleType());
        IDHandler.writeRelationType(colEnd, type.longId(), dirID, type.isInvisibleType());
        long[] sortKeyIDs = type.getSortKey();
        Preconditions.checkArgument(sortKey.length >= sortKeyIDs.length);
        assert colStart.getPosition() == colEnd.getPosition();
        int keyStartPos = colStart.getPosition();
        int keyEndPos = -1;
        for (int i = 0; i < sortKey.length && sortKey[i] != null; i++) {
            PropertyKey skey = sortKey[i].key;
            Interval interval = sortKey[i].interval;
            if (i >= sortKeyIDs.length) {
                assert !type.multiplicity().isUnique(dir);
                assert (skey instanceof ImplicitKey) && (skey == ImplicitKey.TITANID || skey == ImplicitKey.ADJACENT_ID);
                assert skey != ImplicitKey.ADJACENT_ID || (i == sortKeyIDs.length);
                assert skey != ImplicitKey.TITANID || (!type.multiplicity().isConstrained() && (i == sortKeyIDs.length && skey.isPropertyKey() || i == sortKeyIDs.length + 1 && skey.isEdgeLabel()));
                assert colStart.getPosition() == colEnd.getPosition();
                assert interval == null || interval.isPoints();
                keyEndPos = colStart.getPosition();
            } else {
                assert !type.multiplicity().isConstrained();
                assert skey.longId() == sortKeyIDs[i];
            }
            if (interval == null || interval.isEmpty()) {
                break;
            }
            if (interval.isPoints()) {
                if (skey == ImplicitKey.TITANID || skey == ImplicitKey.ADJACENT_ID) {
                    assert !type.multiplicity().isUnique(dir);
                    VariableLong.writePositiveBackward(colStart, (Long) interval.getStart());
                    VariableLong.writePositiveBackward(colEnd, (Long) interval.getEnd());
                } else {
                    writeInline(colStart, skey, interval.getStart(), InlineType.KEY);
                    writeInline(colEnd, skey, interval.getEnd(), InlineType.KEY);
                }
            } else {
                if (interval.getStart() != null)
                    writeInline(colStart, skey, interval.getStart(), InlineType.KEY);
                if (interval.getEnd() != null)
                    writeInline(colEnd, skey, interval.getEnd(), InlineType.KEY);
                switch(type.getSortOrder()) {
                    case ASC:
                        sliceStart = colStart.getStaticBuffer();
                        sliceEnd = colEnd.getStaticBuffer();
                        if (!interval.startInclusive())
                            sliceStart = BufferUtil.nextBiggerBuffer(sliceStart);
                        if (interval.endInclusive())
                            sliceEnd = BufferUtil.nextBiggerBuffer(sliceEnd);
                        break;
                    case DESC:
                        sliceEnd = colStart.getStaticBufferFlipBytes(keyStartPos, colStart.getPosition());
                        sliceStart = colEnd.getStaticBufferFlipBytes(keyStartPos, colEnd.getPosition());
                        if (interval.startInclusive())
                            sliceEnd = BufferUtil.nextBiggerBuffer(sliceEnd);
                        if (!interval.endInclusive())
                            sliceStart = BufferUtil.nextBiggerBuffer(sliceStart);
                        break;
                    default:
                        throw new AssertionError(type.getSortOrder().toString());
                }
                assert sliceStart.compareTo(sliceEnd) <= 0;
                break;
            }
        }
        if (sliceStart == null) {
            assert sliceEnd == null && colStart.getPosition() == colEnd.getPosition();
            if (keyEndPos < 0)
                keyEndPos = colStart.getPosition();
            switch(type.getSortOrder()) {
                case ASC:
                    sliceStart = colStart.getStaticBuffer();
                    break;
                case DESC:
                    sliceStart = colStart.getStaticBufferFlipBytes(keyStartPos, keyEndPos);
                    break;
                default:
                    throw new AssertionError(type.getSortOrder().toString());
            }
            sliceEnd = BufferUtil.nextBiggerBuffer(sliceStart);
        }
    }
    return new SliceQuery(sliceStart, sliceEnd);
}

Example 3 with Interval

use of com.thinkaurelius.titan.util.datastructures.Interval in project titan by thinkaurelius.

the class BasicVertexCentricQueryBuilder method constructQueryWithoutProfile.

protected BaseVertexCentricQuery constructQueryWithoutProfile(RelationCategory returnType) {
    assert returnType != null;
    Preconditions.checkArgument(adjacentVertex == null || returnType == RelationCategory.EDGE, "Vertex constraints only apply to edges");
    if (limit <= 0)
        return BaseVertexCentricQuery.emptyQuery();
    //Prepare direction
    if (returnType == RelationCategory.PROPERTY) {
        if (dir == Direction.IN)
            return BaseVertexCentricQuery.emptyQuery();
        dir = Direction.OUT;
    }
    //Prepare order
    orders.makeImmutable();
    assert orders.hasCommonOrder();
    //Prepare constraints
    And<TitanRelation> conditions = QueryUtil.constraints2QNF(tx, constraints);
    if (conditions == null)
        return BaseVertexCentricQuery.emptyQuery();
    //Don't be smart with query limit adjustments - it just messes up the caching layer and penalizes when appropriate limits are set by the user!
    int sliceLimit = limit;
    //Construct (optimal) SliceQueries
    EdgeSerializer serializer = tx.getEdgeSerializer();
    List<BackendQueryHolder<SliceQuery>> queries;
    if (!hasTypes()) {
        BackendQueryHolder<SliceQuery> query = new BackendQueryHolder<SliceQuery>(serializer.getQuery(returnType, querySystem), ((dir == Direction.BOTH || (returnType == RelationCategory.PROPERTY && dir == Direction.OUT)) && !conditions.hasChildren()), orders.isEmpty());
        if (sliceLimit != Query.NO_LIMIT && sliceLimit < Integer.MAX_VALUE / 3) {
            //If only one direction is queried, ask for twice the limit from backend since approximately half will be filtered
            if (dir != Direction.BOTH && (returnType == RelationCategory.EDGE || returnType == RelationCategory.RELATION))
                sliceLimit *= 2;
        }
        query.getBackendQuery().setLimit(computeLimit(conditions.size(), sliceLimit));
        queries = ImmutableList.of(query);
        conditions.add(returnType);
        conditions.add(new //Need this to filter out newly created invisible relations in the transaction
        VisibilityFilterCondition<TitanRelation>(querySystem ? VisibilityFilterCondition.Visibility.SYSTEM : VisibilityFilterCondition.Visibility.NORMAL));
    } else {
        Set<RelationType> ts = new HashSet<RelationType>(types.length);
        queries = new ArrayList<BackendQueryHolder<SliceQuery>>(types.length + 2);
        Map<RelationType, Interval> intervalConstraints = new HashMap<RelationType, Interval>(conditions.size());
        final boolean isIntervalFittedConditions = compileConstraints(conditions, intervalConstraints);
        for (Interval pint : intervalConstraints.values()) {
            //Check if one of the constraints leads to an empty result set
            if (pint.isEmpty())
                return BaseVertexCentricQuery.emptyQuery();
        }
        for (String typeName : types) {
            InternalRelationType type = QueryUtil.getType(tx, typeName);
            if (type == null)
                continue;
            Preconditions.checkArgument(!querySystem || (type instanceof SystemRelationType), "Can only query for system types: %s", type);
            if (type instanceof ImplicitKey)
                throw new UnsupportedOperationException("Implicit types are not supported in complex queries: " + type);
            ts.add(type);
            Direction typeDir = dir;
            if (type.isPropertyKey()) {
                if (returnType == RelationCategory.EDGE)
                    throw new IllegalArgumentException("Querying for edges but including a property key: " + type.name());
                returnType = RelationCategory.PROPERTY;
                typeDir = Direction.OUT;
            }
            if (type.isEdgeLabel()) {
                if (returnType == RelationCategory.PROPERTY)
                    throw new IllegalArgumentException("Querying for properties but including an edge label: " + type.name());
                returnType = RelationCategory.EDGE;
                if (!type.isUnidirected(Direction.BOTH)) {
                    //Make sure unidirectionality lines up
                    if (typeDir == Direction.BOTH) {
                        if (type.isUnidirected(Direction.OUT))
                            typeDir = Direction.OUT;
                        else
                            typeDir = Direction.IN;
                    } else //Directions are incompatible
                    if (!type.isUnidirected(typeDir))
                        continue;
                }
            }
            if (type.isEdgeLabel() && typeDir == Direction.BOTH && intervalConstraints.isEmpty() && orders.isEmpty()) {
                //TODO: This if-condition is a little too restrictive - we also want to include those cases where there
                // ARE intervalConstraints or orders but those cannot be covered by any sort-keys
                SliceQuery q = serializer.getQuery(type, typeDir, null);
                q.setLimit(sliceLimit);
                queries.add(new BackendQueryHolder<SliceQuery>(q, isIntervalFittedConditions, true));
            } else {
                //Optimize for each direction independently
                Direction[] dirs = { typeDir };
                if (typeDir == Direction.BOTH) {
                    if (type.isEdgeLabel())
                        dirs = new Direction[] { Direction.OUT, Direction.IN };
                    else
                        //property key
                        dirs = new Direction[] { Direction.OUT };
                }
                for (Direction direction : dirs) {
                    /*
                        Find best scoring relation type to answer this query with. We score each candidate by the number
                        of conditions that each sort-keys satisfy. Equality conditions score higher than interval conditions
                        since they are more restrictive. We assign additional points if the sort key satisfies the order
                        of this query.
                        */
                    InternalRelationType bestCandidate = null;
                    double bestScore = Double.NEGATIVE_INFINITY;
                    boolean bestCandidateSupportsOrder = false;
                    for (InternalRelationType candidate : type.getRelationIndexes()) {
                        //Filter out those that don't apply
                        if (!candidate.isUnidirected(Direction.BOTH) && !candidate.isUnidirected(direction))
                            continue;
                        if (!candidate.equals(type) && candidate.getStatus() != SchemaStatus.ENABLED)
                            continue;
                        boolean supportsOrder = orders.isEmpty() ? true : orders.getCommonOrder() == candidate.getSortOrder();
                        int currentOrder = 0;
                        double score = 0.0;
                        PropertyKey[] extendedSortKey = getExtendedSortKey(candidate, direction, tx);
                        for (int i = 0; i < extendedSortKey.length; i++) {
                            PropertyKey keyType = extendedSortKey[i];
                            if (currentOrder < orders.size() && orders.getKey(currentOrder).equals(keyType))
                                currentOrder++;
                            Interval interval = intervalConstraints.get(keyType);
                            if (interval == null || !interval.isPoints()) {
                                if (interval != null)
                                    score += 1;
                                break;
                            } else {
                                assert interval.isPoints();
                                score += 5.0 / interval.getPoints().size();
                            }
                        }
                        if (supportsOrder && currentOrder == orders.size())
                            score += 3;
                        if (score > bestScore) {
                            bestScore = score;
                            bestCandidate = candidate;
                            bestCandidateSupportsOrder = supportsOrder && currentOrder == orders.size();
                        }
                    }
                    Preconditions.checkArgument(bestCandidate != null, "Current graph schema does not support the specified query constraints for type: %s", type.name());
                    //Construct sort key constraints for the best candidate and then serialize into a SliceQuery
                    //that is wrapped into a BackendQueryHolder
                    PropertyKey[] extendedSortKey = getExtendedSortKey(bestCandidate, direction, tx);
                    EdgeSerializer.TypedInterval[] sortKeyConstraints = new EdgeSerializer.TypedInterval[extendedSortKey.length];
                    constructSliceQueries(extendedSortKey, sortKeyConstraints, 0, bestCandidate, direction, intervalConstraints, sliceLimit, isIntervalFittedConditions, bestCandidateSupportsOrder, queries);
                }
            }
        }
        if (queries.isEmpty())
            return BaseVertexCentricQuery.emptyQuery();
        conditions.add(getTypeCondition(ts));
    }
    return new BaseVertexCentricQuery(QueryUtil.simplifyQNF(conditions), dir, queries, orders, limit);
}

Example 4 with Interval

use of com.thinkaurelius.titan.util.datastructures.Interval in project titan by thinkaurelius.

the class BasicVertexCentricQueryBuilder method constructSliceQueries.

private void constructSliceQueries(PropertyKey[] extendedSortKey, EdgeSerializer.TypedInterval[] sortKeyConstraints, int position, InternalRelationType bestCandidate, Direction direction, Map<RelationType, Interval> intervalConstraints, int sliceLimit, boolean isIntervalFittedConditions, boolean bestCandidateSupportsOrder, List<BackendQueryHolder<SliceQuery>> queries) {
    if (position < extendedSortKey.length) {
        PropertyKey keyType = extendedSortKey[position];
        Interval interval = intervalConstraints.get(keyType);
        if (interval != null) {
            sortKeyConstraints[position] = new EdgeSerializer.TypedInterval(keyType, interval);
            position++;
        }
        if (interval != null && interval.isPoints()) {
            //Keep invoking recursively to see if we can satisfy more constraints...
            for (Object point : interval.getPoints()) {
                EdgeSerializer.TypedInterval[] clonedSKC = Arrays.copyOf(sortKeyConstraints, sortKeyConstraints.length);
                clonedSKC[position - 1] = new EdgeSerializer.TypedInterval(keyType, new PointInterval(point));
                constructSliceQueries(extendedSortKey, clonedSKC, position, bestCandidate, direction, intervalConstraints, sliceLimit, isIntervalFittedConditions, bestCandidateSupportsOrder, queries);
            }
            return;
        }
    }
    //...otherwise this is it and we can construct the slicequery
    boolean isFitted = isIntervalFittedConditions && position == intervalConstraints.size();
    if (isFitted && position > 0) {
        //If the last interval is open ended toward the larger values, then its not fitted because we need to
        //filter out NULL values which are serialized with -1 (largest value) byte up front.
        EdgeSerializer.TypedInterval lastInterval = sortKeyConstraints[position - 1];
        if (!lastInterval.interval.isPoints() && lastInterval.interval.getEnd() == null)
            isFitted = false;
    }
    EdgeSerializer serializer = tx.getEdgeSerializer();
    SliceQuery q = serializer.getQuery(bestCandidate, direction, sortKeyConstraints);
    q.setLimit(computeLimit(intervalConstraints.size() - position, sliceLimit));
    queries.add(new BackendQueryHolder<SliceQuery>(q, isFitted, bestCandidateSupportsOrder));
}