Optimized class to reduce Describe limit in salesforce

/**
*The purpose of this class is to reduce the Describe limits and increasing performance of your app
*author:Sandeep
**/
public class SchemaCache {
    private static Map gdMap {get;set;}
    private static Map dsrMap = new Map();
    private static Map dfrMap = new Map();
    private static Map<String, Map> sObjFldMap = new Map<String, Map>();
    
    //Only retrive map of sobjects if not already retrieved
    public static Map getGlobalDescribeMap() {
        if(gdMap == null) {
            gdMap = Schema.getGlobalDescribe();
        }
        return gdMap;
    }
    
    //Describe an object only once otherwise returns already described
    public static DescribeSobjectResult getSobjectDescribe(String obj) {
        if(!dsrMap.containsKey(obj)) {
            dsrMap.put(obj, getGlobalDescribeMap().get(obj).getDescribe());
        }
        return dsrMap.get(obj);
    }
    
    //Return map of sobject obj's field using efficient approach
    public static Map getSobjectFieldsMap(String obj) {
        if(!sObjFldMap.containsKey(obj)) {
            sObjFldMap.put(obj, getSobjectDescribe(obj).fields.getMap());
        }
        return sObjFldMap.get(obj);
    }
    
    //Describe a field of an object only once otherwise returns field already described
    public static DescribeFieldResult getFieldDescribe(String obj, String fld) {
        if(!dfrMap.containsKey(fld)) {
            dfrMap.put(fld, getSobjectDescribe(obj).fields.getMap().get(fld).getDescribe());
        }
        return dfrMap.get(fld);
    }
}