Apex Singleton design pattern for Schema object to get recordtype Id by name.

You must have read many articles about using the schema object to get record type id for a given object and record type name instead of using good old SOQL hence reducing number of querys.

But…

That creates a new problem…

Every you need a record id a new Schema object gets initialized in the transaction.

This looks like a perfect place to implement singleton design pattern

Public class utility {
    private static Map<String,Schema.SObjectType> schemaInst = null;
    public static Map<String, Schema.SObjectType> getSchemaInst() {
        if (schemaInst == null) 
            schemaInst = Schema.getGlobalDescribe();
        return schemaInst;
    }

}

So whenever you want to get recordTypeId by name of a given object…

All you need to do is …

Map<String, Id> recordTypeInfos = new Map<String, Id>();
for(Schema.RecordTypeInfo recType: Utility.getSchemaInstance().get(sObjectAPIName).getDescribe().getRecordTypeInfos()){
   if(recType.isActive()){
     recordTypeInfos.put(recType.getDeveloperName(), recType.getRecordTypeId());
   }     
  }