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Key: CAY-365
Summary: Use BitSet to touched attributes
Type: Improvement
Status: Assigned
Priority: Minor
Project: Cayenne
Components:
Cayenne Core Library
Versions:
1.2 [DEV]
Assignee: Andrus Adamchik
Reporter: Gili Tzabari
Created: Thu, 1 Sep 2005 11:25 PM
Updated: Thu, 1 Sep 2005 11:25 PM
Description:
We should consider using a BitSet to keep track of which attributes were "touched" by the user in order to know which attributes to check for modification and which ones to skip.
A attribute is said to be "touched" if Cayenne passes the user a mutable reference via a getter method or the user invokes a setter method.
Consider for example if an ObjEntity contains ten String attributes and the user only set one of them. Checking for modification via a BitSet is theoretically faster than invoking equals() on the underlying object (whether String or otherwise). In fact, for immutable objects it might be enough to use the == operator and simply compare memory addresses.
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