Hi,
I have face a problem :
I have severals EJB and I need to have an historic for severals attributes.
I m searching for a solution that should be performant and generic.
I have think to the following solution, maybe you have others ones.
1. The basic solution
----------------------
Each attribute is modelised like a collection of attribute, each attribute
has an associated date.
I need to create methods like :
getSalary(Date ...)
setSalary(Date ...)
2. What are the problems
-------------------------
It sounds that each attribute is a collection of EJB, I want if possible
minimize the number of EJB. But if I use serializable class the change on
the attributes are not reflected to the remote Bean.
Does I need to load all the collection to get the value of the attribute at
a specific date.
Yes, if I have an attribute at 10/10/2000 and the second at 20/10/2000, I
need to scan the collection and :
1. I get at least the 2 values and by example I apply a average
2. I get the older one ( 20/10/2000 )
So I need to put some management rules, maybe different for each kind of
attribute.
What I need
------------
I m searching for THE optimal solution ( If exists ).
My priorities :
- Performance in term of access and memory
- Flexibility in the design to add constraits and new features
- Easy to use
I hope that someone can help me
Thanks a lot for your help.
If you have faced the same problem and/or you have simple
idea, feel free to propose it !!
Christophe Demez
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