Re: Enterprise using WO

>
>
>> Change notification among instances is something you cannot escape  
>> from. As you say you can use EOF based ones (David Neumman's) or  
>> other non EOF.
>>
>
> I'm very skeptical of network based notifications.  I've just  
> always used the pattern that if I need fresh data from the  
> database, I should go back to the database (the original store) to  
> get fresh data anyway.  The database can scale and is built to do so.
>
> mark

Mark,

The problem is that in practice you always need fresh data, even for  
what we might call Reference Data (Customer, Country localisations,  
etc.) And depending on the domain you might need to get the data  
closer to the application, for performance reasons for example, or  
just to balance your investments (you can cut a couple of Oracle cpu  
licences by using a distributed cache also)
In those cases I prefer to believe in distributed cache solutions,  
and of course all of them use a network based notification of some sort.

So what I was trying to say, and believe me that this is not usually  
seen like this by developers, is that if you have a cache (in EOF  
this is the default) and you have multiple intances you are going to  
need a net based notification, either because you explicitly build it  
(David Neumann's ChangeNotification for EOF) or because the tool/ 
vendor you are using is going to do it for you (OSCache, Tangosol  
Coherence, Gigaspaces, etc.)

cheers,

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