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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-599) Support lambda functions (or similar) for log message parameters
Date Sat, 08 Aug 2015 05:10:46 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662811#comment-14662811
] 

Ralph Goers commented on LOG4J2-599:
------------------------------------

I just looked at the branch and am struggling a little bit with what I see - it doesn't strike
me as really supporting Java 8 or Java Lambdas, but instead allows the lambda syntax to be
used . I would think to be complete we would need methods that accept at least Supplier, Function,
Predicate, although java.util.logging.Logger only supports Supplier.

On another note, how will the log4j-jul Logger deal with the Supplier? Will it resolve the
result there or pass the Supplier along (which it can't do if we use a Callable). To support
the new methods we will either have to create a new log4j-jul8 module or use reflection tricks
to support them.

> 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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