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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 Mon, 10 Aug 2015 08:39:46 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14679797#comment-14679797
] 

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

If arrays are the main concern I would suggest we improve the AbstractLogger for entry(Object...):
The code is already checking if the TRACE level is enabled, but in the message construction
logic we can check if any of the params is an array and do something more useful than the
default toString.

If there is a need for an {{entry(Supplier<?>...)}} method we can add it later.

> 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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