[infinispan-dev] Per-invocation flag wiki

[Galder Zamarreño]

On May 16, 2011, at 7:47 PM, Sanne Grinovero wrote:

> 2011/5/16 Emmanuel Bernard <emmanuel at hibernate.org>:
>> Couldn't you have a higher level flag that says Flag.IGNORE_RETURN_VALUE so that people wo a PhD can benefit form the feature?
> 
> when I discovered that, that was my exact thought as well.
> 
> then we started discussing about a proper interface to avoid return
> values.. should be typesafe (i.e. not have a return type at all), but
> then there are two main use cases: no return values, async return
> values. and the complexity of the API exploded, the thread was killed
> and we got a better idea. I hope we'll publish that soon.

Publish what?

> 
> Sanne
> 
>> 
>> On 16 mai 2011, at 19:37, Sanne Grinovero wrote:
>> 
>>> good place to remind that if you don't want the return value of a
>>> write operation then you need to specify both flags:
>>> cache.withFlags(Flag.SKIP_REMOTE_LOOKUP, Flag.SKIP_CACHE_LOAD).put( .. )
>>> 
>>> I guess that nobody knows that :)
>>> 
>>> Sanne
>>> 
>>> 2011/5/16 Emmanuel Bernard <emmanuel at hibernate.org>:
>>>> Yes I think something use case driven would make a nice portal.
>>>> 
>>>> On 16 mai 2011, at 17:22, Galder Zamarreño wrote:
>>>> 
>>>>> 
>>>>> On May 16, 2011, at 2:23 PM, Emmanuel Bernard wrote:
>>>>> 
>>>>>> Your description explains a use case / pattern but wo code showing how to implement it properly.
>>>>> 
>>>>> True and I think you have a point, though the use of putForExternalRead() itself is something that should be documented either its javadoc or a separate wiki.
>>>>> 
>>>>> This wiki should be limited to explaining the actual flags.
>>>>> 
>>>>>> In this case what's the best way for me to verify that the new data has indeed been pushed to the cache?
>>>>>> put and then immediate get
>>>>>> Put, wait, get
>>>>>> Put all entries, then get all entries, and loop till all entries supposedly put are indeed present.
>>>>>> Same as above but with some kind of batch size instead of all the data set?
>>>>>> Or is there some kind of queue/log I can look for to get the reliable list of failures?
>>>>> 
>>>>> If you need immediate verification I would not use putForExternalRead() but maybe a putAsync() with the flags you want which returns you a future and allows you to verify the result in a less wacky way.
>>>>> 
>>>>> The normal use case of PFER is:
>>>>> 1. Check the cache whether an k/v is present
>>>>> 2. If not present, go to db and call PFER with it.
>>>>> 3. Use whatever you retrieved from db to do your job.
>>>>> ...
>>>>> N. Check the cache whether k/v is present
>>>>> N+1. Oh, it's present, so just use it instead of going to DB.
>>>>> 
>>>>> This could be a good FAQ, wdyt?
>>>>> 
>>>>>> 
>>>>>> Emmanuel
>>>>>> 
>>>>>> 
>>>>>> On 16 mai 2011, at 10:20, Galder Zamarreño <galder at redhat.com> wrote:
>>>>>> 
>>>>>>> More wikis. I've just created http://community.jboss.org/docs/DOC-16803 which explains what Infinispan flags are, what they're used for...etc.
>>>>>>> 
>>>>>>> Feedback appreciated
>>>>>>> --
>>>>>>> Galder Zamarreño
>>>>>>> Sr. Software Engineer
>>>>>>> Infinispan, JBoss Cache
>>>>>>> 
>>>>>>> 
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>>>>>> 
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>>>>> 
>>>>> --
>>>>> Galder Zamarreño
>>>>> Sr. Software Engineer
>>>>> Infinispan, JBoss Cache
>>>>> 
>>>>> 
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--
Galder Zamarreño
Sr. Software Engineer
Infinispan, JBoss Cache