Examples of org.apache.cassandra.dht.Range

org.apache.cassandra.dht.Range
A representation of the range that a node is responsible for on the DHT ring. Author : Avinash Lakshman ( alakshman@facebook.com) & Prashant Malik ( pmalik@facebook.com )

        predicate.setSlice_range(sliceRange);


        // From keys "" to ""...
        IPartitioner partitioner = StorageService.getPartitioner();
        ByteBuffer empty = ByteBufferUtil.EMPTY_BYTE_BUFFER;
        Range range = new Range(partitioner.getToken(empty), partitioner.getToken(empty));


        // Get a bunch of rows!
        List<Row> rows;
        try
        {

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        // verify we get it back w/ index query too
        IndexExpression expr = new IndexExpression(COLUMN, IndexOperator.EQ, VALUE);
        IndexClause clause = new IndexClause(Arrays.asList(expr), ByteBufferUtil.EMPTY_BYTE_BUFFER, Integer.MAX_VALUE);
        IFilter filter = new IdentityQueryFilter();
        IPartitioner p = StorageService.getPartitioner();
        Range range = new Range(p.getMinimumToken(), p.getMinimumToken());
        rows = table.getColumnFamilyStore(CF1).scan(clause, range, filter);
        assertEquals(LOOPS, rows.size());


        // we don't allow cleanup when the local host has no range to avoid wipping up all data when a node has not join the ring.
        // So to make sure cleanup erase everything here, we give the localhost the tiniest possible range.

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        // basic single-expression query
        IndexExpression expr = new IndexExpression(ByteBufferUtil.bytes("birthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(1L));
        IndexClause clause = new IndexClause(Arrays.asList(expr), ByteBufferUtil.EMPTY_BYTE_BUFFER, 100);
        IFilter filter = new IdentityQueryFilter();
        IPartitioner p = StorageService.getPartitioner();
        Range range = new Range(p.getMinimumToken(), p.getMinimumToken());
        List<Row> rows = Table.open("Keyspace1").getColumnFamilyStore("Indexed1").scan(clause, range, filter);


        assert rows != null;
        assert rows.size() == 2 : StringUtils.join(rows, ",");

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        IndexExpression expr = new IndexExpression(ByteBufferUtil.bytes("birthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(34L));
        IndexExpression expr2 = new IndexExpression(ByteBufferUtil.bytes("notbirthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(1L));
        IndexClause clause = new IndexClause(Arrays.asList(expr, expr2), ByteBufferUtil.EMPTY_BYTE_BUFFER, 100);
        IFilter filter = new IdentityQueryFilter();
        IPartitioner p = StorageService.getPartitioner();
        Range range = new Range(p.getMinimumToken(), p.getMinimumToken());
        List<Row> rows = Table.open("Keyspace1").getColumnFamilyStore("Indexed1").scan(clause, range, filter);


        assert rows != null;
        assert rows.size() == 50 : rows.size();
        Set<DecoratedKey> keys = new HashSet<DecoratedKey>();

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        IndexExpression expr = new IndexExpression(ByteBufferUtil.bytes("birthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(1L));
        IndexClause clause = new IndexClause(Arrays.asList(expr), ByteBufferUtil.EMPTY_BYTE_BUFFER, 100);
        IFilter filter = new IdentityQueryFilter();
        IPartitioner p = StorageService.getPartitioner();
        Range range = new Range(p.getMinimumToken(), p.getMinimumToken());
        List<Row> rows = cfs.scan(clause, range, filter);
        assert rows.size() == 1 : StringUtils.join(rows, ",");
        String key = new String(rows.get(0).key.key.array(),rows.get(0).key.key.position(),rows.get(0).key.key.remaining()); 
        assert "k1".equals( key );

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        IndexExpression expr = new IndexExpression(ByteBufferUtil.bytes("birthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(1L));
        IndexClause clause = new IndexClause(Arrays.asList(expr), ByteBufferUtil.EMPTY_BYTE_BUFFER, 100);
        IFilter filter = new IdentityQueryFilter();
        IPartitioner p = StorageService.getPartitioner();
        Range range = new Range(p.getMinimumToken(), p.getMinimumToken());
        List<Row> rows = table.getColumnFamilyStore("Indexed1").scan(clause, range, filter);
        assert rows.size() == 0;


        expr = new IndexExpression(ByteBufferUtil.bytes("birthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(2L));
        clause = new IndexClause(Arrays.asList(expr), ByteBufferUtil.EMPTY_BYTE_BUFFER, 100);

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        IndexExpression expr1 = new IndexExpression(ByteBufferUtil.bytes("birthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(1L));
        IndexExpression expr2 = new IndexExpression(ByteBufferUtil.bytes("notbirthdate"), IndexOperator.GT, ByteBufferUtil.bytes(1L));
        IndexClause clause = new IndexClause(Arrays.asList(new IndexExpression[]{ expr1, expr2 }), ByteBufferUtil.EMPTY_BYTE_BUFFER, 1);
        IFilter filter = new IdentityQueryFilter();
        IPartitioner p = StorageService.getPartitioner();
        Range range = new Range(p.getMinimumToken(), p.getMinimumToken());
        List<Row> rows = Table.open("Keyspace1").getColumnFamilyStore("Indexed1").scan(clause, range, filter);


        assert rows != null;
        assert rows.size() == 1 : StringUtils.join(rows, ",");
    }

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    {
        IndexExpression expr = new IndexExpression(ByteBufferUtil.bytes("birthdate"), IndexOperator.EQ, ByteBufferUtil.bytes(1L));
        IndexClause clause = new IndexClause(Arrays.asList(expr), ByteBufferUtil.EMPTY_BYTE_BUFFER, 100);
        IFilter filter = new IdentityQueryFilter();
        IPartitioner p = StorageService.getPartitioner();
        Range range = new Range(p.getMinimumToken(), p.getMinimumToken());
        List<Row> rows = table.getColumnFamilyStore("Indexed2").scan(clause, range, filter);
        assert rows.size() == 1 : StringUtils.join(rows, ",");
        assertEquals("k1", ByteBufferUtil.string(rows.get(0).key.key));
    }

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        SlicePredicate emptyRangePred = new SlicePredicate();
        emptyRangePred.slice_range = emptySliceRange;
        SlicePredicate nonEmptyRangePred = new SlicePredicate();
        nonEmptyRangePred.slice_range = nonEmptySliceRange;
        IPartitioner part = StorageService.getPartitioner();
        AbstractBounds bounds = new Range(part.getRandomToken(), part.getRandomToken());
        
        Message namesCmd = new RangeSliceCommand(Statics.KS, "Standard1", null, namesPred, bounds, 100).getMessage();
        Message emptyRangeCmd = new RangeSliceCommand(Statics.KS, "Standard1", null, emptyRangePred, bounds, 100).getMessage();
        Message regRangeCmd = new RangeSliceCommand(Statics.KS, "Standard1", null,  nonEmptyRangePred, bounds, 100).getMessage();
        Message namesCmdSup = new RangeSliceCommand(Statics.KS, "Super1", Statics.SC, namesPred, bounds, 100).getMessage();

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        mt.split(tok(4));
        mt.split(tok(6));
        mt.split(tok(7));


        assertEquals(4, mt.size());
        assertEquals(new Range(tok(7), tok(-1)), mt.get(tok(-1)));
        assertEquals(new Range(tok(-1), tok(4)), mt.get(tok(3)));
        assertEquals(new Range(tok(-1), tok(4)), mt.get(tok(4)));
        assertEquals(new Range(tok(4), tok(6)), mt.get(tok(6)));
        assertEquals(new Range(tok(6), tok(7)), mt.get(tok(7)));


        // check depths
        assertEquals((byte)1, mt.get(tok(4)).depth);
        assertEquals((byte)2, mt.get(tok(6)).depth);
        assertEquals((byte)3, mt.get(tok(7)).depth);

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