Laird Nelson wrote:
>
> Assaf Arkin wrote:
>
> [lots of good stuff]
>
> Could you additionally address dan's point from a later message that is
> related to this, viz:
>
> > It is hard for me to believe that synchronize is not allowed (even as wrappers
>around
> > code within method calls). For example suppose that I have created a multi-safe
>data
> > structure using synchronize. Are you saying that I cant use that data structure
> > within the bean? Surely some of the jdk datastructures have synchronized methods.
>
> Does this mean, for example, that I cannot use Hashtable or Vector in my
> bean classes?
Yes you can, as long as they are not shared between two threads.
If you use a Vector or Hashtable from one thread and something happens
to your thread inside the synchronized stuff, your Hashtable/Vector
might be corrupted. But you shouldn't care. IF something happens to your
thread, the EJB server will discard that bean (always).
If you are using two threads and something happens to thread A that
leaves the Vector in an indeterminate state, then thread B might break
and you have no control over that.
I've just implemented some piece of the CMP engine that manages locks
using synchronized. I expect that something might happen to the thread
since the EJB server controls it, and have extra (even redundant) code
just to make sure that never happens.
In the Java 1.2 collections Sun addressed that by writing the collectors
so they do not rely on synchronized.
arkin
>
> Cheers,
> Laird
>
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--
----------------------------------------------------------------------
Assaf Arkin www.exoffice.com
CTO, Exoffice Technologies, Inc. www.exolab.org
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