Besides the example code Simon mentioned at https://github.com/apache/metron/tree/master/metron-stellar/stellar-3rd-party-example , there is some documentation at http://metron.apache.org/current-book/metron-stellar/stellar-common/3rdPartyStellar.html
From: Nick Allen <n...@nickallen.org> Reply-To: "user@metron.apache.org" <user@metron.apache.org> Date: Wednesday, January 17, 2018 at 4:46 AM To: "user@metron.apache.org" <user@metron.apache.org> Subject: Re: Define a function that can be used in Stellar If something we have already does not fit the bill, I would recommend creating that function in Java. Since you described it as "a bit complex" and "the logic would be complicated" I don't see any value in defining something like this in Stellar with named functions. Best On Wed, Jan 17, 2018 at 7:38 AM Simon Elliston Ball <si...@simonellistonball.com> wrote: 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
