Retrieve logical object from within a physical object stored by Aerospike

getDeviceMetaDataUsingBlocking.java

    public static final int BIT_MASK_SIZE = 25;
    public static final BigInteger BIT_MASK = (new BigInteger("2")).pow(BIT_MASK_SIZE).subtract(new BigInteger("1"));
    public static final String METADATA_BIN_NAME = "deviceMetaData";
    public static final AerospikeClient aeroClient = new AerospikeClient(hostName,aerospikeServicePort);

    /**
     * Get device meta data from Aerospike having employed 'blocking' technique
     * @param deviceIDasUUID - device id
     * @return device meta data
     */
    public Map<String,Object> getDeviceMetaData(UUID deviceIDasUUID){
        // Turn UUID into a BigInteger to help with bit masking
        BigInteger deviceID = new BigInteger(deviceIDasUUID.toString().replace("-",""),32);
        // Do bit masking
        BigInteger physicalKey = deviceID.and(BIT_MASK);
        // Construct Aerospike key using key built using bit masking
        Key aerospikeKey= new Key(deviceDataNamespace,deviceDataSetName,physicalKey.toString());

        // Retrieve record from map. We use the 'physical' aerospikeKey to identify the object
        // and the device id to retrieve the metadata from the map
        Record r = aeroClient.operate(null,aerospikeKey,
                MapOperation.getByKey(METADATA_BIN_NAME,Value.get(deviceIDasUUID.toString()), MapReturnType.VALUE));

        return (Map<String, Object>) r.getMap(METADATA_BIN_NAME);
    }