Have you looked at the recent TLSH functions in Stellar? We already have that for similarity preserving hashes.
Simon > On 17 Jan 2018, at 12:35, Ali Nazemian <alinazem...@gmail.com> wrote: > > It is a bit complex. We want to create a function that accepts a list of > arguments for an asset and generate an asset identifier that can be used as a > row_key for the enrichment store. The logic would be complicated, though. We > may need to include some sort of similarity aware hash function as a part of > this custom function. > >> On Wed, Jan 17, 2018 at 10:32 PM, Nick Allen <n...@nickallen.org> wrote: >> Ali - Can you describe the logic that you are trying to perform? That would >> be useful as a use case to help drive a discussion around creating named >> functions in Stellar. >> >> >> >> >>> On Wed, Jan 17, 2018 at 6:29 AM Ali Nazemian <alinazem...@gmail.com> wrote: >>> Thanks, Simon. We have already got a script to deal with classpath >>> management for the parsers. We should be able to use it for this extension >>> as well. >>> >>> Yeah, I agree. It will be much easier to define functions on the fly and >>> use them afterwards. It could be defined as Lambda or custom function. >>> >>> Regards, >>> Ali >>> >>> >>> >>>> On Wed, Jan 17, 2018 at 9:42 PM, Simon Elliston Ball >>>> <si...@simonellistonball.com> wrote: >>>> https://github.com/apache/metron/tree/master/metron-stellar/stellar-3rd-party-example >>>> gives good details on how to add a stellar function. >>>> >>>> Stellar will pick up an annotated function on its class path, so to add >>>> function there is no need to rebuild metron module, but you do need your >>>> modules on the classpath, and, pending 777, to deal with things like class >>>> path clash in your dependencies. >>>> >>>> Another idea worth discussion on the dev list is probably the notion of >>>> defining stellar functions in stellar, which would be a much simpler >>>> solution than custom java functions if you can already express you logic >>>> in stellar. >>>> >>>> Simon >>>> >>>> >>>>> On 17 Jan 2018, at 10:37, Ali Nazemian <alinazem...@gmail.com> wrote: >>>>> >>>>> Hi Simon, >>>>> >>>>> Yes, that is exactly what we are looking for. Is there any example >>>>> regarding adding a Stellar function in Java? Hopefully, we don't need to >>>>> rebuild the corresponding modules for this? >>>>> >>>>> Cheers, >>>>> Ali >>>>> >>>>>> On Wed, Jan 17, 2018 at 8:40 PM, Simon Elliston Ball >>>>>> <si...@simonellistonball.com> wrote: >>>>>> At present you can certainly create custom stellar functions in Java. >>>>>> I’m guessing however that what you’re looking to do is create a kind of >>>>>> function that combines a number of stellar functions to avoid >>>>>> repetition, or to ensure consistency of certain parameters for example. >>>>>> Is that what you’re looking for? Maybe some sort of syntax to create a >>>>>> named stellar function similar to the way we create lambdas? >>>>>> >>>>>> Simon >>>>>> >>>>>> > On 17 Jan 2018, at 07:25, Ali Nazemian <alinazem...@gmail.com> wrote: >>>>>> > >>>>>> > Hi all, >>>>>> > >>>>>> > Is there any way that we can define a function that can be used rather >>>>>> > than duplicating a logic multiple times? >>>>>> > >>>>>> > Cheers, >>>>>> > Ali >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> A.Nazemian >>>> >>> >>> >>> >>> -- >>> A.Nazemian > > > > -- > A.Nazemian
