[jbosscache-dev] JBCACHE-388 Provide modified data in callbacks

[Manik Surtani]

Well, nodeModified covers 3 scenarios:

1) Data added to map
2) Data removed from map
3) Existing map data changed

if we just passed in deltas, we'd also need to pass in keys to  
describe the operation.  I.e., a nodeVisited event could pass in a  
key-value pair, but we'd also need to pass in an identifier to  
describe the modification.  Which makes it pretty tedious.  This is  
why I opted for just passing a snapshot of the state of data before  
and after the mod.


--
Manik Surtani

Lead, JBoss Cache
JBoss, a division of Red Hat

Email: manik at jboss.org
Telephone: +44 7786 702 706
MSN: manik at surtani.org
Yahoo/AIM/Skype: maniksurtani


On 29 Oct 2006, at 16:20, Ben Wang wrote:

> Yes, are are right. Silly me, I was looking at the pre only.
>
> Still, my question is that will it make more sense during post- 
> nodeModified notification to deliver only the data modified (not  
> the new data map). If I am only interested what portion of my data  
> has been modified (and I belive this is a quite common use case),  
> then I would need to keep an old data map and diff it with the new  
> data map. Doable but it would be a performance killer for sure.
>
> Thanks,
>
> -Ben
>
> -----Original Message-----
> From: Manik Surtani [mailto:msurtani at redhat.com]
> Sent: Friday, October 27, 2006 11:14 PM
> To: Ben Wang
> Cc: jbosscache-dev at lists.jboss.org
> Subject: Re: [jbosscache-dev] JBCACHE-388 Provide modified data in  
> callbacks
>
> Is this when pre is true or false?
>
> If pre is true, the data will be the old data.  If pre is false, it  
> will be the new data.
> --
> Manik Surtani
>
> Lead, JBoss Cache
> JBoss, a division of Red Hat
>
> Email: msurtani at redhat.com
> Telephone: +44 7786 702 706
> MSN: manik at surtani.org
> Yahoo/AIM/Skype: maniksurtani
>
>
>
> On 27 Oct 2006, at 13:47, Ben Wang wrote:
>
>> Manik,
>>
>> Can you clarify the semantics for the modified callbacks?
>> Specifically, I am looking at the test case:
>> CacheListenerTest.testRemoveData()
>> calling
>>       cache.remove(fqn, "key2");
>> Still has the nodeModified() coming with the original data map. Is
>> this the expected behavior?
>>
>> I am hoping to see a semantics that bundles exactly the modified  
>> data.
>>
>> Thanks,
>>
>> -Ben
>>
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>
>