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https://issues.apache.org/jira/browse/LOG4J2-242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13670082#comment-13670082
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Ralph Goers commented on LOG4J2-242:
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I do not like having
log.message("abc").with(exception).info();
as it implies that the current log event will be created and then either stored
in the Logger or in a ThreadLocal. Since loggers are thread safe the event
really can't be stored there, leaving a ThreadLocal as the only way to
accomplish this. It also would have side effects such as partially built log
events that aren't delivered due to an intervening exception. These partially
built events would then bleed into the next log event.
An EventBuilder has some merit. However, it isn't clear to me how this is any
better than using the logging methods and specifying them as parameters.
As for varargs, StringFormatMessage and MessageFormatMessage should also detect
the Throwable and return it. They, along with ParameterizedMessage are really
the only Messages that accept varargs from the Log4j API - which is the reason
this behavior is required. Other Messages, such as SimpleMessage and
ObjectMessage, can never be passed a Throwable in that way.
> Make Messages more fluent
> -------------------------
>
> Key: LOG4J2-242
> URL: https://issues.apache.org/jira/browse/LOG4J2-242
> Project: Log4j 2
> Issue Type: Improvement
> Components: API
> Affects Versions: 2.0-beta5
> Reporter: Bruce Brouwer
>
> I really like the feature were we can pass in a Message object into the
> logger methods. However, it bugs me that some of the implementations of
> Message provide vararg constructors, and others only provide an Object[]
> parameter. I really would like to write this code:
> log.info(new ParameterizedMessage("abc: {} xyz: {}", abc, xyz),
> throwable);
> I realize that this particular example would work with this code by default:
> log.info("abc: {} xyz: {}", abc, xyz, throwable);
> But the other Message implementations don't provide a vararg constructor, nor
> do they try to detect the last parameter as a Throwable.
> [LOG4J2-48] addresses some of the complexity of having varargs with the last
> vararg being an implicit final parameter, but again, this only works with
> ParameterizedMessage. But I would like this to be more consistent across the
> board. One idea that I had was this:
> log.info(new ParameterizedMessage("abc: {} xyz: {}", abc,
> xyz).throwing(throwable));
> Now all of the message constructors (not just ParameterizedMessage) could
> have varargs with none of them providing a Throwable parameter in the
> constructor, but provided through a more fluent API. I don't know that it
> would warrant adding it to the Message interface, but we could go further
> with it by adding these methods:
> Message withParameters(Object... parameters);
> Message throwing(Throwable throwable);
> It wouldn't be absolutely necessary as the concrete implementations could
> define that and work in my case.
> Another idea that I had was maybe a bit more impactful to the Logger API.
> What if I wrote my code like this:
> log.with(exception).info("abc: {} xyz: {}", abc, xyz);
> // or maybe this
> log.message("abc: {} xyz: {}", abc, xyz).with(exception).info();
> That would necessitate something like a LogBuilder interface, maybe tie it
> into the MessageFactory classes. This LogBuilder interface could have these
> methods:
> LogBuilder message(String pattern, Object... params);
> LogBuilder with(Throwable t);
> LogBuilder marker(Marker marker);
> LogBuilder level(Level level);
> void info(); // and others like it
> void info(String pattern, Object... params); // and others like it
> I'm not exactly sure what the best way would be to go and implement this as
> I'm sure you don't want to have objects created all over the place.
> Is this an idea worth pursuing a bit further?
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