When using DataView/IDataProvider size() is called before iterator(int first, int count) causing calls to DAOs to be duplicated. Our current framework that is internally using Hibernate allows one call to be made to a DAO that returns both the total result size and the actual records (based off first/count). The problem is that the first and count are unknown until the iterator method is called- forcing multiple calls to the DAO to retrieve the data (also forcing multiple transactions). What are the reasons behind calling size before iterator?
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