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Posted to commits@cloudstack.apache.org by GitBox <gi...@apache.org> on 2022/08/04 18:00:52 UTC

[GitHub] [cloudstack] GutoVeronezi commented on issue #5891: Quota: custom tariffs

GutoVeronezi commented on issue #5891:
URL: https://github.com/apache/cloudstack/issues/5891#issuecomment-1205593607

   As explained the issue description, we choose [J2V8] to be our JS engine based on its relevance, performance and implementation; However, we faced a dependency on a GCC version higher or equal to 4.9. CentOS7, by default, is shipped with GCC 4.8, therefore, to build the packages we would need to build a newer GCC version and install it. In order to avoid this barrier, we searched for another JS engine and found [Nashorn Engine] (standalone). 
   
   "The Nashorn JavaScript engine was first incorporated into JDK 8 via [JEP 174] as a replacement for the Rhino scripting engine" ([JEP 372]). Due to the rapid pace of development of ECMAScript, the community found Nashorn challenging to maintain. Then, in JDK 11, they started the engine deprecation ([JEP 335]). After that, the OpenJDK community created a standalone version of the [Nashorn Engine], which is available for JDK 11 and after.
   
   Currently, ACS is developed under JDK 11, which still has the engine as built-in; however, looking at future compatibility, we decided to use the standalone [Nashorn Engine] version.
   
   [Nashorn Engine] (standalone) will attend our necessities with JS processing inside Java, allowing users to write rules for Quota tariffs, equally as we achieved with [J2V8].
   
   
   [J2V8]: https://github.com/eclipsesource/J2V8
   [Nashorn Engine]: https://github.com/openjdk/nashorn
   [JEP 174]: https://openjdk.org/jeps/174
   [JEP 335]: https://openjdk.org/jeps/335
   [JEP 372]: https://openjdk.org/jeps/372
   


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