@Override
    public void toObject(String data) {
        String[] keyValues = data.split(Const.ARRAY_PARSER_SPLIT);
        for (String keyValue : keyValues) {
            int i = keyValue.lastIndexOf(Const.KEY_VALUE_SPLIT);
            if (i > 0) {
                String key = keyValue.substring(0, i);
                String value = keyValue.substring(i + 1);
                if (StringUtil.isNotEmpty(key) && StringUtil.isNotEmpty(value)) {
                    this.data.put(key, Long.parseLong(value));
                }
            }
        }
    }
@return the sum of all values.
oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/analysis/metrics/DataTable.java