[infinispan-dev] Per-invocation flag wiki

Sanne Grinovero sanne.grinovero at gmail.com
Mon May 16 13:37:31 EDT 2011


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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>>
>> --
>> Galder Zamarreño
>> Sr. Software Engineer
>> Infinispan, JBoss Cache
>>
>>
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>> infinispan-dev at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/infinispan-dev
>
>
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