Examples with TriplePatternStrategy org.apache.rya.api.query.strategy.TriplePatternStrategy used on opensource projects

Example 1 with TriplePatternStrategy

use of org.apache.rya.api.query.strategy.TriplePatternStrategy in project incubator-rya by apache.

the class AccumuloQueryRuleset method getRange.

/**
 * Turn a single StatementPattern into a Range.
 * @param conf
 * @throws IOException if the range can't be resolved
 */
private Map.Entry<TABLE_LAYOUT, ByteRange> getRange(final StatementPattern sp) throws IOException {
    final Var context = sp.getContextVar();
    final Statement stmt = new NullableStatementImpl((Resource) sp.getSubjectVar().getValue(), (URI) sp.getPredicateVar().getValue(), sp.getObjectVar().getValue(), context == null ? null : (Resource) context.getValue());
    final RyaStatement rs = RdfToRyaConversions.convertStatement(stmt);
    final TriplePatternStrategy strategy = ryaContext.retrieveStrategy(rs);
    final Map.Entry<TABLE_LAYOUT, ByteRange> entry = strategy.defineRange(rs.getSubject(), rs.getPredicate(), rs.getObject(), rs.getContext(), conf);
    return entry;
}

Example 2 with TriplePatternStrategy

use of org.apache.rya.api.query.strategy.TriplePatternStrategy in project incubator-rya by apache.

the class StatementPatternStorage method createRange.

protected Map.Entry<TABLE_LAYOUT, Range> createRange(Value s_v, Value p_v, Value o_v) throws IOException {
    RyaURI subject_rya = RdfToRyaConversions.convertResource((Resource) s_v);
    RyaURI predicate_rya = RdfToRyaConversions.convertURI((URI) p_v);
    RyaType object_rya = RdfToRyaConversions.convertValue(o_v);
    TriplePatternStrategy strategy = ryaContext.retrieveStrategy(subject_rya, predicate_rya, object_rya, null);
    if (strategy == null) {
        return new RdfCloudTripleStoreUtils.CustomEntry<TABLE_LAYOUT, Range>(TABLE_LAYOUT.SPO, new Range());
    }
    Map.Entry<TABLE_LAYOUT, ByteRange> entry = strategy.defineRange(subject_rya, predicate_rya, object_rya, null, null);
    ByteRange byteRange = entry.getValue();
    return new RdfCloudTripleStoreUtils.CustomEntry<org.apache.rya.api.RdfCloudTripleStoreConstants.TABLE_LAYOUT, Range>(entry.getKey(), new Range(new Text(byteRange.getStart()), new Text(byteRange.getEnd())));
}

Example 3 with TriplePatternStrategy

use of org.apache.rya.api.query.strategy.TriplePatternStrategy in project incubator-rya by apache.

the class AccumuloRyaQueryEngine method queryWithBindingSet.

@Override
public CloseableIteration<? extends Map.Entry<RyaStatement, BindingSet>, RyaDAOException> queryWithBindingSet(Collection<Map.Entry<RyaStatement, BindingSet>> stmts, AccumuloRdfConfiguration conf) throws RyaDAOException {
    if (conf == null) {
        conf = configuration;
    }
    // query configuration
    Authorizations authorizations = conf.getAuthorizations();
    Long ttl = conf.getTtl();
    Long maxResults = conf.getLimit();
    Integer maxRanges = conf.getMaxRangesForScanner();
    Integer numThreads = conf.getNumThreads();
    // TODO: cannot span multiple tables here
    try {
        Collection<Range> ranges = new HashSet<Range>();
        RangeBindingSetEntries rangeMap = new RangeBindingSetEntries();
        TABLE_LAYOUT layout = null;
        RyaURI context = null;
        TriplePatternStrategy strategy = null;
        RyaURI columnFamily = null;
        boolean columnFamilySet = false;
        for (Map.Entry<RyaStatement, BindingSet> stmtbs : stmts) {
            RyaStatement stmt = stmtbs.getKey();
            context = stmt.getContext();
            // Scanner will fetch all ColumnFamilies.
            if (!columnFamilySet) {
                columnFamily = context;
                columnFamilySet = true;
            } else if (columnFamily != null && !columnFamily.equals(context)) {
                columnFamily = null;
            }
            BindingSet bs = stmtbs.getValue();
            strategy = ryaContext.retrieveStrategy(stmt);
            if (strategy == null) {
                throw new IllegalArgumentException("TriplePattern[" + stmt + "] not supported");
            }
            Map.Entry<RdfCloudTripleStoreConstants.TABLE_LAYOUT, ByteRange> entry = strategy.defineRange(stmt.getSubject(), stmt.getPredicate(), stmt.getObject(), stmt.getContext(), conf);
            // use range to set scanner
            // populate scanner based on authorizations, ttl
            layout = entry.getKey();
            ByteRange byteRange = entry.getValue();
            Range range = new Range(new Text(byteRange.getStart()), new Text(byteRange.getEnd()));
            Range rangeMapRange = range;
            // as the Value specified in the BindingSet
            if (context != null) {
                byte[] contextBytes = context.getData().getBytes("UTF-8");
                rangeMapRange = range.bound(new Column(contextBytes, new byte[] { (byte) 0x00 }, new byte[] { (byte) 0x00 }), new Column(contextBytes, new byte[] { (byte) 0xff }, new byte[] { (byte) 0xff }));
            }
            // ranges gets a Range that has no Column bounds, but
            // rangeMap gets a Range that does have Column bounds
            // If we inserted multiple Ranges with the same Row (but
            // distinct Column bounds) into the Set ranges, we would get
            // duplicate
            // results when the Row is not exact. So RyaStatements that
            // differ only in their context are all mapped to the same
            // Range (with no Column bounds) for scanning purposes.
            // However, context information is included in a Column that
            // bounds the Range inserted into rangeMap. This is because
            // in the class {@link RyaStatementBindingSetKeyValueIterator},
            // the rangeMap is
            // used to join the scan results with the BindingSets to produce
            // the query results. The additional ColumnFamily info is
            // required in this join
            // process to allow for the Statement contexts to be compared
            // with the BindingSet contexts
            // See {@link RangeBindingSetEntries#containsKey}.
            ranges.add(range);
            rangeMap.put(rangeMapRange, bs);
        }
        // no ranges. if strategy alone is null, it would be thrown in the loop above.
        if (layout == null || strategy == null) {
            return null;
        }
        String regexSubject = conf.getRegexSubject();
        String regexPredicate = conf.getRegexPredicate();
        String regexObject = conf.getRegexObject();
        TripleRowRegex tripleRowRegex = strategy.buildRegex(regexSubject, regexPredicate, regexObject, null, null);
        String table = layoutToTable(layout, conf);
        boolean useBatchScanner = ranges.size() > maxRanges;
        RyaStatementBindingSetKeyValueIterator iterator = null;
        if (useBatchScanner) {
            ScannerBase scanner = connector.createBatchScanner(table, authorizations, numThreads);
            ((BatchScanner) scanner).setRanges(ranges);
            fillScanner(scanner, columnFamily, null, ttl, null, tripleRowRegex, conf);
            iterator = new RyaStatementBindingSetKeyValueIterator(layout, ryaContext, scanner, rangeMap);
        } else {
            Scanner scannerBase = null;
            Iterator<Map.Entry<Key, Value>>[] iters = new Iterator[ranges.size()];
            int i = 0;
            for (Range range : ranges) {
                scannerBase = connector.createScanner(table, authorizations);
                scannerBase.setRange(range);
                fillScanner(scannerBase, columnFamily, null, ttl, null, tripleRowRegex, conf);
                iters[i] = scannerBase.iterator();
                i++;
            }
            iterator = new RyaStatementBindingSetKeyValueIterator(layout, Iterators.concat(iters), rangeMap, ryaContext);
        }
        if (maxResults != null) {
            iterator.setMaxResults(maxResults);
        }
        return iterator;
    } catch (Exception e) {
        throw new RyaDAOException(e);
    }
}

Example 4 with TriplePatternStrategy

use of org.apache.rya.api.query.strategy.TriplePatternStrategy in project incubator-rya by apache.

the class AccumuloRyaQueryEngine method query.

@Override
public CloseableIterable<RyaStatement> query(RyaQuery ryaQuery) throws RyaDAOException {
    Preconditions.checkNotNull(ryaQuery);
    RyaStatement stmt = ryaQuery.getQuery();
    Preconditions.checkNotNull(stmt);
    // query configuration
    String[] auths = ryaQuery.getAuths();
    Authorizations authorizations = auths != null ? new Authorizations(auths) : configuration.getAuthorizations();
    Long ttl = ryaQuery.getTtl();
    Long currentTime = ryaQuery.getCurrentTime();
    Long maxResults = ryaQuery.getMaxResults();
    Integer batchSize = ryaQuery.getBatchSize();
    String regexSubject = ryaQuery.getRegexSubject();
    String regexPredicate = ryaQuery.getRegexPredicate();
    String regexObject = ryaQuery.getRegexObject();
    TableLayoutStrategy tableLayoutStrategy = configuration.getTableLayoutStrategy();
    try {
        // find triple pattern range
        TriplePatternStrategy strategy = ryaContext.retrieveStrategy(stmt);
        TABLE_LAYOUT layout;
        Range range;
        RyaURI subject = stmt.getSubject();
        RyaURI predicate = stmt.getPredicate();
        RyaType object = stmt.getObject();
        RyaURI context = stmt.getContext();
        String qualifier = stmt.getQualifer();
        TripleRowRegex tripleRowRegex = null;
        if (strategy != null) {
            // otherwise, full table scan is supported
            Map.Entry<RdfCloudTripleStoreConstants.TABLE_LAYOUT, ByteRange> entry = strategy.defineRange(subject, predicate, object, context, null);
            layout = entry.getKey();
            ByteRange byteRange = entry.getValue();
            range = new Range(new Text(byteRange.getStart()), new Text(byteRange.getEnd()));
        } else {
            range = new Range();
            layout = TABLE_LAYOUT.SPO;
            strategy = ryaContext.retrieveStrategy(layout);
        }
        byte[] objectTypeInfo = null;
        if (object != null) {
            // TODO: Not good to serialize this twice
            if (object instanceof RyaRange) {
                objectTypeInfo = RyaContext.getInstance().serializeType(((RyaRange) object).getStart())[1];
            } else {
                objectTypeInfo = RyaContext.getInstance().serializeType(object)[1];
            }
        }
        tripleRowRegex = strategy.buildRegex(regexSubject, regexPredicate, regexObject, null, objectTypeInfo);
        // use range to set scanner
        // populate scanner based on authorizations, ttl
        String table = layoutToTable(layout, tableLayoutStrategy);
        Scanner scanner = connector.createScanner(table, authorizations);
        scanner.setRange(range);
        if (batchSize != null) {
            scanner.setBatchSize(batchSize);
        }
        fillScanner(scanner, context, qualifier, ttl, currentTime, tripleRowRegex, ryaQuery.getConf());
        FluentCloseableIterable<RyaStatement> results = FluentCloseableIterable.from(new ScannerBaseCloseableIterable(scanner)).transform(keyValueToRyaStatementFunctionMap.get(layout));
        if (maxResults != null) {
            results = results.limit(maxResults.intValue());
        }
        return results;
    } catch (Exception e) {
        throw new RyaDAOException(e);
    }
}

Example 5 with TriplePatternStrategy

use of org.apache.rya.api.query.strategy.TriplePatternStrategy in project incubator-rya by apache.

the class HashedPoWholeRowTriplePatternStrategyTest method testRegex.

public void testRegex() throws Exception {
    RyaURI subj = new RyaURI("urn:test#1234");
    RyaURI pred = new RyaURI("urn:test#pred");
    RyaURI obj = new RyaURI("urn:test#obj");
    RyaStatement ryaStatement = new RyaStatement(subj, pred, obj);
    Map<RdfCloudTripleStoreConstants.TABLE_LAYOUT, TripleRow> serialize = new WholeRowHashedTripleResolver().serialize(ryaStatement);
    TripleRow tripleRow = serialize.get(RdfCloudTripleStoreConstants.TABLE_LAYOUT.SPO);
    String row = new String(tripleRow.getRow());
    TriplePatternStrategy spoStrategy = new HashedSpoWholeRowTriplePatternStrategy();
    TriplePatternStrategy poStrategy = new HashedPoWholeRowTriplePatternStrategy();
    TriplePatternStrategy ospStrategy = new OspWholeRowTriplePatternStrategy();
    // pred
    TripleRowRegex tripleRowRegex = spoStrategy.buildRegex(null, pred.getData(), null, null, null);
    Pattern p = Pattern.compile(tripleRowRegex.getRow());
    Matcher matcher = p.matcher(row);
    assertTrue(matcher.matches());
    // subj
    tripleRowRegex = spoStrategy.buildRegex(subj.getData(), null, null, null, null);
    p = Pattern.compile(tripleRowRegex.getRow());
    matcher = p.matcher(row);
    assertTrue(matcher.matches());
    // obj
    tripleRowRegex = spoStrategy.buildRegex(null, null, obj.getData(), null, null);
    p = Pattern.compile(tripleRowRegex.getRow());
    matcher = p.matcher(row);
    assertTrue(matcher.matches());
    // po table
    row = new String(serialize.get(RdfCloudTripleStoreConstants.TABLE_LAYOUT.PO).getRow());
    tripleRowRegex = poStrategy.buildRegex(null, pred.getData(), null, null, null);
    p = Pattern.compile(tripleRowRegex.getRow());
    matcher = p.matcher(row);
    assertTrue(matcher.matches());
    tripleRowRegex = poStrategy.buildRegex(null, pred.getData(), obj.getData(), null, null);
    p = Pattern.compile(tripleRowRegex.getRow());
    matcher = p.matcher(row);
    assertTrue(matcher.matches());
    tripleRowRegex = poStrategy.buildRegex(subj.getData(), pred.getData(), obj.getData(), null, null);
    p = Pattern.compile(tripleRowRegex.getRow());
    matcher = p.matcher(row);
    assertTrue(matcher.matches());
    // various regex
    tripleRowRegex = poStrategy.buildRegex(null, "urn:test#pr[e|d]{2}", null, null, null);
    p = Pattern.compile(tripleRowRegex.getRow());
    matcher = p.matcher(row);
    assertTrue(matcher.matches());
    // does not match
    tripleRowRegex = poStrategy.buildRegex(null, "hello", null, null, null);
    p = Pattern.compile(tripleRowRegex.getRow());
    matcher = p.matcher(row);
    assertFalse(matcher.matches());
}