public void doubleSlots()

in priam/src/main/java/com/netflix/priam/identity/DoubleRing.java [54:95]
36 lines of code
6 McCabe index (conditional complexity)

    public void doubleSlots() {
        Set<PriamInstance> local = getInstancesInSameRegion();

        // delete all
        for (PriamInstance data : local) factory.delete(data);

        int hash = tokenManager.regionOffset(instanceInfo.getRegion());
        // move existing slots.
        for (PriamInstance data : local) {
            int slot = (data.getId() - hash) * 2;
            factory.create(
                    data.getApp(),
                    hash + slot,
                    data.getInstanceId(),
                    data.getHostName(),
                    data.getHostIP(),
                    data.getRac(),
                    data.getVolumes(),
                    data.getToken());
        }

        int new_ring_size = local.size() * 2;
        for (PriamInstance data : getInstancesInSameRegion()) {
            // if max then rotate.
            int currentSlot = data.getId() - hash;
            int new_slot =
                    currentSlot + 3 > new_ring_size
                            ? (currentSlot + 3) - new_ring_size
                            : currentSlot + 3;
            String token =
                    tokenManager.createToken(new_slot, new_ring_size, instanceInfo.getRegion());
            factory.create(
                    data.getApp(),
                    new_slot + hash,
                    InstanceIdentity.DUMMY_INSTANCE_ID,
                    instanceInfo.getHostname(),
                    config.usePrivateIP() ? instanceInfo.getPrivateIP() : instanceInfo.getHostIP(),
                    data.getRac(),
                    null,
                    token);
        }
    }