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 )


        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").search(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").search(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").search(clause, range, filter);
        assert rows.size() == 1 : StringUtils.join(rows, ",");
        assertEquals("k1", ByteBufferUtil.string(rows.get(0).key.key));
    }

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        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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    /** @return the number of nodes bootstrapping into source's primary range */
    public int pendingRangeChanges(InetAddress source)
    {
        int n = 0;
        Range sourceRange = getPrimaryRangeFor(getToken(source));
        for (Token token : bootstrapTokens.keySet())
            if (sourceRange.contains(token))
                n++;
        return n;
    }

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        }
    }


    public Range getPrimaryRangeFor(Token right)
    {
        return new Range(getPredecessor(right), right);
    }

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        validator.prepare();
        validator.complete();


        // confirm that the tree was validated
        Token min = validator.tree.partitioner().getMinimumToken();
        assert null != validator.tree.hash(new Range(min, min));


        // wait for queued operations to be flushed
        flushAES().get(5000, TimeUnit.MILLISECONDS);
    }

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        validator.add(new CompactedRow(new DecoratedKey(mid, "inconceivable!"),
                                       new DataOutputBuffer()));
        validator.complete();


        // confirm that the tree was validated
        assert null != validator.tree.hash(new Range(min, min));
    }

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        MerkleTree rtree = validator.tree;


        // change a range in one of the trees
        Token min = StorageService.instance().getPartitioner().getMinimumToken();
        ltree.invalidate(min);
        MerkleTree.TreeRange changed = ltree.invalids(new Range(min, min)).next();
        changed.hash("non-empty hash!".getBytes());


        // difference the trees
        Differencer diff = new Differencer(new CFPair(tablename, cfname),
                                           LOCAL, LOCAL, ltree, rtree);

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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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