if you want to use ejbs, have bean A publish a JMS message whenever it is changed,
bean B is then a MDB that receives those
notifications, and does whatever it needs to then. that way you have no polling.
hth
dim
----- Original Message -----
From: "Fabian Crabus" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, January 25, 2002 3:04 AM
Subject: AW: Re: Implementing wait in EJBs
ok, don't use an ejb for this...
how about simple external java class (implemented as a startup class or whatever)
which is
allowed to handle threads...
-----Urspr�ngliche Nachricht-----
Von: Sriphani Singaraju [mailto:[EMAIL PROTECTED]]
Gesendet: Do 24.01.2002 16:11
An: [EMAIL PROTECTED]
Cc:
Betreff: Re: Implementing wait in EJBs
Actually, I should have been more specific. In my case, Bean A is a legacy
component(Neither any assumptions nor any
tampering Bean A). So, I feel that the resources pointed to, may not be applicable for
this. As Bean B, do I have any other options
than busy-waiting ??
-----Original Message-----
From: Fabian Crabus [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 24, 2002 7:25 PM
To: Sriphani Singaraju; [EMAIL PROTECTED]
Subject: AW: Re: Implementing wait in EJBs
You could try this:
http://www.theserverside.com/patterns/ObserverPattern.jsp
or you could use JMS:
let Bean A notify Bean B of any state changes
so indirectly Bean A activates Bean B
How about this?
-----Urspr�ngliche Nachricht-----
Von: Sriphani Singaraju [mailto:[EMAIL PROTECTED]]
Gesendet: Do 24.01.2002 14:23
An: Fabian Crabus; [EMAIL PROTECTED]
Cc:
Betreff: RE: Re: Implementing wait in EJBs
Hi Fabian,
The scenario goes like this:
Bean B invokes a method on Bean A (B is ignorant of the state of A)
Bean B should try this repeatedly until the state of A is changed (to
a state favourable for servicing Bean B's
request).
I know it is a performance overhead, but, thatz how the business logic
goes. For this case, I'm worried more abt
achieving this rather than the amount of time Bean B is blocked.
Hope this makes my point clear!
Regards,
Sriphani.
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