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https://issues.apache.org/jira/browse/LOG4J2-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679342#comment-14679342
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Gary Gregory commented on LOG4J2-599:
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Then perhaps {{ObjectSupplier}} would be OK but not great since many logger
APIs take {{Object}}s, but we also have {{String}}s... debug(Object) and
debug(String).
I'm still not crazy about {{Java8Logger}} because (1) we might end up with
other APIs in there and (2) what if we want to add more Java 8 APIs later, what
will the subinterface be called then? I know... YAGNI.
An alternative is to require Java 8 and use Java 8's Supplier. But this is a
separate issue. When would we make Java 8 the min req?
> 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
> Assignee: Remko Popma
> Priority: Minor
> Labels: Java8
> Fix For: 2.4
>
>
> 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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