private void setRacks()

in src/main/java/org/apache/cassandra/distributed/shared/AbstractBuilder.java [454:499]
41 lines of code
16 McCabe index (conditional complexity)

    private void setRacks()
    {
        if (nodeIdTopology == null)
            nodeIdTopology = new HashMap<>();

        boolean shouldCalculatePerRackCount = false;
        boolean hasExplicitPerRackCount = false;
        for (Rack rack : racks)
        {
            if (rack.rackNodeCount == -1)
                shouldCalculatePerRackCount = true;
            else
                hasExplicitPerRackCount = true;
        }

        if (shouldCalculatePerRackCount && hasExplicitPerRackCount)
            throw new IllegalStateException("Can't mix explicit and implicit per rack counts");

        int nodeId = nodeIdTopology.isEmpty() ? 1 : Collections.max(nodeIdTopology.keySet()) + 1;
        if (shouldCalculatePerRackCount)
        {
            if (nodeCount == 0)
                throw new IllegalStateException("Node count must be set when not setting per rack counts");
            int totalRacks = racks.size();
            int nodesPerRack = (nodeCount + totalRacks - 1) / totalRacks;

            for (Rack rack : racks)
                for (int i = 1; i <= nodesPerRack; i++)
                    nodeIdTopology.put(nodeId++, NetworkTopology.dcAndRack(rack.dcName, rack.rackName));
        }
        else
        {
            for (Rack rack : racks)
                for (int i = 1; i <= rack.rackNodeCount; i++)
                    nodeIdTopology.put(nodeId++, NetworkTopology.dcAndRack(rack.dcName, rack.rackName));
        }

        if (nodeCount != nodeIdTopology.size())
        {
            assert nodeIdTopology.size() > nodeCount : "withRacks should only ever increase the node count";
            if (nodeCount == 0)
                nodeCount =  nodeIdTopology.size();
            else if (logTopology())
                System.out.printf("Network topology of %s requires more nodes, only starting %s out of %s configured nodes%n", nodeIdTopology, nodeCount, nodeIdTopology.size());
        }
    }