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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-599) Support lambda functions (or similar) for log message parameters
Date Sat, 08 Aug 2015 06:20:46 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662829#comment-14662829
] 

Remko Popma commented on LOG4J2-599:
------------------------------------

Gary, I created a benchmark but it looks like creating a vararg array is pretty much free
(single-digit nanoseconds on my laptop). Given this, do we still want to extra methods for
this in the API?
{noformat}
Benchmark                                          Mode  Samples   Score   Error  Units
o.a.l.l.p.j.VarargsBenchmark.baseline            sample   104426  23.136 ± 1.239  ns/op
o.a.l.l.p.j.VarargsBenchmark.individualParams    sample   152946  10.910 ± 0.771  ns/op
o.a.l.l.p.j.VarargsBenchmark.varargParams        sample   151369  12.535 ± 0.934  ns/op
{noformat}


> Support lambda functions (or similar) for log message parameters
> ----------------------------------------------------------------
>
>                 Key: LOG4J2-599
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-599
>             Project: Log4j 2
>          Issue Type: Brainstorming
>          Components: Core
>            Reporter: Matt Sicker
>            Priority: Minor
>              Labels: Java8
>
> It would be nice if we could support 0-param lambda functions (or the equivalent: interfaces
with a single empty-parameter message call), or more simply, allow Runnables (or something
similar) to be passed which will be dynamically executed if the log message is enabled.
> The use case here is that although string construction of the log message is a performance
issue that is already solved quite well, the problem of adding in information to the log message
that makes other calculations still needs to be wrapped in an if check.
> I'm not sure if it'd be best to just use Runnable, or create a new interface, or try
to emulate how Java 1.8 lambdas work via an interface with a single method defined. The details
here would still need to be fleshed out, but I think this sort of feature could be rather
handy (especially in a Java 1.8+ environment, or in Groovy/Scala/etc.).



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