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LexEVS provides classes to extend and interfaces to implement that help provide the framework for in-memory transformations of source files into the LexGrid model. If the target source is large, batch loading may well be a better solution, in which case the Loader Framework built on Spring Batch may be a better match for source loading. On the other hand, users may find the standard LexEVS loader interface a little easier to implement. 

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Pass Control Back to BaseLoader

So the The tasks are to read the file into some kind of logical model or bean class object, organize these objects or make them available to be mapped into LexEVS objects, tie all objects together as a coding scheme, and pass this potentially large coding scheme object to the LexEVS BaseLoader to be persisted to the database.  Back up the execution chain in MeDRALoaderImpl the doLoad method first calls the mapping method of the conversion class MedDRA2LGMain to get the reading and mapping done, then passes control of the resulting coding scheme to BaseLoader by calling this.persistCodingSchemeToDatabase method on the BaseLoader super class.  While it's not necessary that things are done this way, many loaders have been written in this fashion.