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using abstract DAO factory

Hanna Habashy
Ranch Hand

Joined: Aug 20, 2003
Posts: 532
hi all:
if abstract DAO factory frame work is used in a multi- threaded J2EE project, when is it appropriate to cach a single object and return it over and over again, vs. retruning a brand new object.
for example:
//cached object
abstract DAOFactory
{
privte EmployeeDAO MyEmployeeDAO = new EmplyeeDAO();
public EmplyeeDAO getEmplyeeDAO();
{ return MyEmployeeDAO;}
}
vs.
//new object
abstract DAOFactory
{
public EmplyeeDAO getEmpoyeeDAO()
{ return new EmplyeeDAO();}
}
I really appreciate it if someone can explain to me in what situation should I use which technique, and if there is any performance implication in using any of them.
thanks


SCJD 1.4<br />SCJP 1.4<br />-----------------------------------<br />"With regard to excellence, it is not enough to know, but we must try to have and use it.<br />" Aristotle
 
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