Examples with TableContext herddb.model.TableContext used on opensource projects

Example 1 with TableContext

use of herddb.model.TableContext in project herddb by diennea.

the class TableManager method streamTableData.

private Stream<Record> streamTableData(ScanStatement statement, StatementEvaluationContext context, Transaction transaction, boolean lockRequired, boolean forWrite) throws StatementExecutionException {
    statement.validateContext(context);
    Predicate predicate = statement.getPredicate();
    boolean acquireLock = transaction != null || forWrite || lockRequired;
    LocalScanPageCache lastPageRead = acquireLock ? null : new LocalScanPageCache();
    IndexOperation indexOperation = predicate != null ? predicate.getIndexOperation() : null;
    boolean primaryIndexSeek = indexOperation instanceof PrimaryIndexSeek;
    AbstractIndexManager useIndex = getIndexForTbleAccess(indexOperation);
    Stream<Map.Entry<Bytes, Long>> scanner = keyToPage.scanner(indexOperation, context, tableContext, useIndex);
    Stream<Record> resultFromTable = scanner.map(entry -> {
        return accessRecord(entry, predicate, context, transaction, lastPageRead, primaryIndexSeek, forWrite, acquireLock);
    }).filter(r -> r != null);
    return resultFromTable;
}

Example 2 with TableContext

use of herddb.model.TableContext in project herddb by diennea.

the class MemoryHashIndexManager method scanner.

@Override
public Stream<Bytes> scanner(IndexOperation operation, StatementEvaluationContext context, TableContext tableContext) throws StatementExecutionException {
    if (operation instanceof SecondaryIndexSeek) {
        SecondaryIndexSeek sis = (SecondaryIndexSeek) operation;
        SQLRecordKeyFunction value = sis.value;
        byte[] refvalue = value.computeNewValue(null, context, tableContext);
        List<Bytes> result = data.get(Bytes.from_array(refvalue));
        if (result != null) {
            return result.stream();
        } else {
            return Stream.empty();
        }
    } else if (operation instanceof SecondaryIndexPrefixScan) {
        SecondaryIndexPrefixScan sis = (SecondaryIndexPrefixScan) operation;
        SQLRecordKeyFunction value = sis.value;
        byte[] refvalue = value.computeNewValue(null, context, tableContext);
        Predicate<Map.Entry<Bytes, List<Bytes>>> predicate = (Map.Entry<Bytes, List<Bytes>> entry) -> {
            byte[] recordValue = entry.getKey().data;
            return Bytes.startsWith(recordValue, refvalue.length, refvalue);
        };
        return data.entrySet().stream().filter(predicate).map(entry -> entry.getValue()).flatMap(l -> l.stream());
    } else if (operation instanceof SecondaryIndexRangeScan) {
        byte[] refminvalue;
        SecondaryIndexRangeScan sis = (SecondaryIndexRangeScan) operation;
        SQLRecordKeyFunction minKey = sis.minValue;
        if (minKey != null) {
            refminvalue = minKey.computeNewValue(null, context, tableContext);
        } else {
            refminvalue = null;
        }
        byte[] refmaxvalue;
        SQLRecordKeyFunction maxKey = sis.maxValue;
        if (maxKey != null) {
            refmaxvalue = maxKey.computeNewValue(null, context, tableContext);
        } else {
            refmaxvalue = null;
        }
        Predicate<Map.Entry<Bytes, List<Bytes>>> predicate;
        if (refminvalue != null && refmaxvalue == null) {
            predicate = (Map.Entry<Bytes, List<Bytes>> entry) -> {
                byte[] datum = entry.getKey().data;
                return Bytes.compare(datum, refminvalue) >= 0;
            };
        } else if (refminvalue == null && refmaxvalue != null) {
            predicate = (Map.Entry<Bytes, List<Bytes>> entry) -> {
                byte[] datum = entry.getKey().data;
                return Bytes.compare(datum, refmaxvalue) <= 0;
            };
        } else if (refminvalue != null && refmaxvalue != null) {
            predicate = (Map.Entry<Bytes, List<Bytes>> entry) -> {
                byte[] datum = entry.getKey().data;
                return Bytes.compare(datum, refmaxvalue) <= 0 && Bytes.compare(datum, refminvalue) >= 0;
            };
        } else {
            predicate = (Map.Entry<Bytes, List<Bytes>> entry) -> {
                return true;
            };
        }
        return data.entrySet().stream().filter(predicate).map(entry -> entry.getValue()).flatMap(l -> l.stream());
    } else {
        throw new UnsupportedOperationException("unsuppported index access type " + operation);
    }
}