3/22/2023 0 Comments Perl json compareEvery release in MusicBrainz has a MusicBrainz identifier, and the CAA is a separate database associating images with these identifiers. The Cover Art Archive (CAA) stores artwork about music. If you’re not familiar with the Cover Art Archive, here’s a brief technical overview of how it works. The project I ported was the caa-indexer, a long running service that achieves consistency between data stored in the MusicBrainz database, and data stored by the Cover Art Archive itself. In this post I will discuss my experience, hopefully providing one more data point for people who are considering using Haskell for production work. The port was done for no real reason other than giving me something to do during my commute, but as work developed I became interested in how the two applications might compare. Yesterday I finished porting a MusicBrainz production service from Perl to Haskell. There is no reason for you to verify every single param to determine if you are working with the same object, pick something that should be unique for your object instead identical parameters.A Comparison Between Perl and Haskell A Comparison Between Perl and Haskell If there was a primary key, it would check the cache and return it if it was cached, otherwise I fetched it from the database. If there was no primary key, it was a new object. I wrote some caching code and what it checked for was the primary key of the object. On the other hand, maybe you should consider how you object is being constructed if you have multiple layers of parameters in your object. You could always write your own serializer for use with Memoize. To really experiment with your data structures, go with Data::Dump::Streamer. Look for the $json->canonical() method in the documentation. JSON::XS is one of the fastest, if not the fastest serializer in Perl. As for what is the fastest, I would only consider that if I was convinced the constructor was that much of a bottleneck that it would matter. I wouldn't go and compare every outstanding object to see whether it may match - if speed is important, I certainly don't want to do a linear search!īecause I know Data::Dumper and YAML, and I don't know Storable very well. Or at least, it would totally irrelevant if I were to make something similar that what you describe you are making. I'd think it's totally irrelevant in your case. There are instances when you want to grab a cache object for a particular namespace "from the ether", and have it automatically return the same object if it was already requested. If you were going to use Data::Dumper or YAML, why wouldn't you use Storable - isn't that generally the fastest serializer? Hard to say what the common case will be. "Fast solutions will terminate comparing as soon as a difference has been found." - good point. What kind of application are you making where the constructor is such a bottle neck you're are looking for the fastest way of serialization? Basically, you want to get a unique, reproducable, representation of your datastructure - after all, after you've found a hash that you've seen before, you want to return the same thing as before.īut I am curious. Fast solutions will terminate comparing as soon as a difference has been found.īut you want more than that. If it would just be the comparison between two hashes, then any serializing-based solution isn't going to be the fastest, unless almost all your comparisons will be between hashes that are the same. "Too many have been sedated by an oppressive environment of political correctness and risk aversion."
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