>>> Robert Pimentel <[EMAIL PROTECTED]> 9/10/99 2:57:59 PM >>>
>Would someone be able to provide a URL that might explain how
servlets
>maintain state?
Check the Sun archive of this list:
http://archives.java.sun.com/archives/servlet-interest.html
>Please correct me if I'm wrong..
> 1. A servlet is run in a single process..regardless
>of the # of requests made
No, not really. A servlet engine runs in a single process but handles
http connections with multiple threads.
Each thread calls the servlet corresponding to the path in the http
request.
> 2.Those requests are handled concurrently
by the threads yes.
> 3. Servlet stays in memory between requests
right again.
>Is all the state information automatically stored on the server
side?
Not quite, there is a session identifier (or session-id) which must
be passed back to the client.
>Are Session Id's/Cookies only used to associate a particular session
with a
>particular user?
No, session-id's are used to identify a session.
>When we use the word 'Session Object', what exactly does that mean?
The session object is the object which represents the session.
Think of the session manager as a hashtable.
Each object in the hashtable is a session.
A session-id is the string-key for the hashtable.
When a request is made the servlet can see if the request is
associated with a session and look up the session object based on the
key.
The session object is also basically a hashtable, but this servlet
can put anything it wants in it, keyed by whatever it wants.
The servlet engine handles the business of making sure an http
response from a servlet includes the session identifier in some way
(most usually as a cookie) so that the client will return the session
identifier with the next call and allow the servlet to pick up the
session again.
This is a very cursory explanation. Hope it helps.
Nic
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