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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (METRON-712) Separate evaluation from parsing in Stellar
Date Thu, 09 Mar 2017 18:47:38 GMT

    [ https://issues.apache.org/jira/browse/METRON-712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15903596#comment-15903596
] 

ASF GitHub Bot commented on METRON-712:
---------------------------------------

Github user asfgit closed the pull request at:

    https://github.com/apache/incubator-metron/pull/473


> Separate evaluation from parsing in Stellar
> -------------------------------------------
>
>                 Key: METRON-712
>                 URL: https://issues.apache.org/jira/browse/METRON-712
>             Project: Metron
>          Issue Type: Improvement
>            Reporter: Casey Stella
>
> With the current implementation of Stellar, we cannot cache the parse tree and then apply
it after the fact. It's just an artifact of how we do the parsing: we actually execute the
statement as we parse rather than constructing an AST that can then be evaluated later given
a message. Essentially what I'm proposing is that we build the equivalent of Pattern.compile()
in Java except for Stellar.
> We should for multiple reasons:
> * code clarity - decoupling the stellar language from the generated parser code
> * performance - saving lexing and parsing for every message



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