Hi,
I still have a question about Servlet+SingleTon :-)
0
If in the "Initialization" of myServlet class, I make a
instance of mySingleTon class, for example:
public class myServlet extends HttpServlet
{
...
//static mySingleTon st=mySingleTon.getInstance();
//or :-)
//mySingleTon st=mySingleTon.getInstance();
...
}
1 -- then when the first time I acess myServlet:
a myServlet will be loaded by one
ClassLoader -- ClassLoaderX :-)
b and I suppose I already find a way to let this Servlet engine
will Always_Only use one special ClassLoader -- for example,
ExtClassLoader -- to load the class mySingleTon :-) so now,
mySingleTon also has been loaded by ExtClassLoader
2 now my questions are :-)
a how long mySingleTon will be "active" before
it is "removed" by ExtClassLoader? for example,
after the first time I acess myServlet with a Browser,
then the second time will be after one day -- the "business"
of my WEB site is very_not_Great, so I have to visit it
BY MYSELF:-) :-) , now I guess
ExtClassLoader will "remove" mySingleTon during this one
day :-)
b With what codition ExtClassLoader will decide to remove
mySingleTon? by time or other ? :-) What is the relation
of ClassLoaderX and ExtClassLoader? does ClassLoaderX
send some infomation to ExtClassLoader about mySingleTon?
c I suppose someone put a "static counter" in mySingleTon,
now I guess after every time that mySingleTon is loaded_
and_remove, this "static counter" will be reset :-) or if
someone put a "DB connection pool" in mySingleTon,
then such connection will be opened again.
d so I want to know how to control the "active interval"
of mySingleTon even if there is not new "client accessing"
to myServlet.
Please correct me if I am wrong :-) Thanks in advance!
Bo
Oct.24, 2000
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