Matt Sicker created LOG4J2-599:
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Summary: 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
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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