If you have multiple users sharing the same bean, then that's what's going to
happen. By synchronizing the get and set method, all you're doing is saying
"Make sure the user finishes this whole get or set method before any other
user can start it." However, that won't prevent another user from calling the
set method right after the first user does and before the first user has a
chance to call the get method. Are you sure you want multiple users sharing
the same bean here? Or do you want multiple users using multiple instances of
the bean (what it sounds like to me)??
"Chenming
Zhao" To: "Tomcat Users List"
<[EMAIL PROTECTED]>
<[EMAIL PROTECTED] cc:
u> Subject: Re: Multiple users share java
bean?
03/25/02
12:52 PM
Please
respond to
"Tomcat Users
List"
Dniel,
There is still one problem: the value set by the second user2 updated the
value of the first user1 before finishing user1's work. I paste the code.
Please take a look.
public class test
{
int numEvents= 5;
public synchronized int test()
{
int real=0;
int eventCounter=0;
while(eventCounter<=numEvents)
{
real=eventCounter;
// wait for 0.01 second
try{wait(10);}
catch(InterruptedException e){};
eventCounter++;
}
return real;
}
public synchronized int setNumEvents(int sec)
{
numEvents= sec;
}
}
For example, I input 200 as the value of numEvents for user1. Before
finishing user1's task, user2 input 100 as numEvents and begin his work. I
hope I can get results 200 and 100 respectively. But I got 100 both.
----- Original Message -----
From: "Daniel Hinojosa" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <[EMAIL PROTECTED]>
Sent: Monday, March 25, 2002 11:35 AM
Subject: Re: Multiple users share java bean?
> If it's a shared bean, sycnchronize it. Make sure that
> all mutators(Setters) are synchronized, and it would be a bad idea to do
> that to the
> accessors (mututors) are synchronized too. If you have more open than
> private member variables in this bean, make sure they are private.
> e.g.
>
> public void synchronized setName(String name) {
> .....
> }
>
> --
> Daniel Hinojosa
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