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Date: Thu, 19 May 2016 08:55:40 -0700 (PDT)
From: Remko Popma <remko.popma@gmail.com>
To: mechanical-sympathy <mechanical-sympathy@googlegroups.com>
Cc: log4j-dev@logging.apache.org
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Subject: Re: Garbage-free Log4j docs preview
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After looking more closely I found that the 
org.slf4j.spi.LocationAwareLogger::log 
<http://www.slf4j.org/api/org/slf4j/spi/LocationAwareLogger.html#log(org.slf4j.Marker, 
java.lang.String, int, java.lang.String, java.lang.Object[], 
java.lang.Throwable)> method is currently not implemented in a garbage-free 
manner in the log4j-slf4j-impl binding. It creates a new message object for 
each call. If there is interest we can address this in a future release. 
Other methods seem okay. 


On Thursday, May 19, 2016 at 4:57:10 PM UTC+9, Jerry Shea wrote:
>
> Ok thanks!
> On 19 May 2016 5:10 pm, "Remko Popma" <remko...@gmail.com <javascript:>> 
> wrote:
>
>> On Thursday, May 19, 2016 at 11:10:45 AM UTC+9, Jerry Shea wrote:
>> > This is fantastic, thanks for this Remko.
>> >
>> >
>> > Can I ask a couple of questions?
>> > 1. is log4j 2.6 designed to operate garbage-free when used as an SLF4J 
>> implementation too, or only with the native API?
>>
>> The log4j-slf4j-impl binding is trying to be garbage-free, but the SLF4J 
>> API only offers up to two parameters for a parameterized message. More than 
>> that uses varargs which creates a temporary object for the parameter array. 
>> The native Log4j 2.6 API has methods for up to ten unrolled parameters.
>>
>> Another consideration is that the native Log4j 2 API lets you log 
>> Objects, not just Strings. Any Object that implements CharSequence can be 
>> logged without creating garbage.
>>
>> You can also implement the log4j Message interface if you want to 
>> separate formatting from your business domain objects.
>>
>> Finally, the native Log4j 2 API has support for logging Java 8 lambdas 
>> (since 2.4).
>>
>> > 2. when do you expect log4j 2.6 to be released GA i.e. ready for 
>> production use?
>>
>> Barring any showstoppers, I expect it will be available in a week or so.
>>
>>
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<div dir=3D"ltr"><div>After looking more closely I found that the=C2=A0<fon=
t face=3D"courier new, monospace">org.slf4j.spi.LocationAwareLogger::<a hre=
f=3D"http://www.slf4j.org/api/org/slf4j/spi/LocationAwareLogger.html#log(or=
g.slf4j.Marker, java.lang.String, int, java.lang.String, java.lang.Object[]=
, java.lang.Throwable)">log</a></font>=C2=A0method is currently not impleme=
nted in a garbage-free manner in the=C2=A0log4j-slf4j-impl binding. It crea=
tes a new message object for each call. If there is interest we can address=
 this in a future release. Other methods seem okay.=C2=A0</div><div><br></d=
iv><div><br>On Thursday, May 19, 2016 at 4:57:10 PM UTC+9, Jerry Shea wrote=
:<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;bo=
rder-left: 1px #ccc solid;padding-left: 1ex;"><p dir=3D"ltr">Ok thanks!</p>
<div class=3D"gmail_quote">On 19 May 2016 5:10 pm, &quot;Remko Popma&quot; =
&lt;<a href=3D"javascript:" target=3D"_blank" gdf-obfuscated-mailto=3D"cvdj=
k6XJAAAJ" rel=3D"nofollow" onmousedown=3D"this.href=3D&#39;javascript:&#39;=
;return true;" onclick=3D"this.href=3D&#39;javascript:&#39;;return true;">r=
emko...@gmail.com</a>&gt; wrote:<br type=3D"attribution"><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">On Thursday, May 19, 2016 at 11:10:45 AM UTC+9, Jerry Shea wr=
ote:<br>
&gt; This is fantastic, thanks for this Remko.<br>
&gt;<br>
&gt;<br>
&gt; Can I ask a couple of questions?<br>
&gt; 1. is log4j 2.6 designed to operate garbage-free when used as an SLF4J=
 implementation too, or only with the native API?<br>
<br>
The log4j-slf4j-impl binding is trying to be garbage-free, but the SLF4J AP=
I only offers up to two parameters for a parameterized message. More than t=
hat uses varargs which creates a temporary object for the parameter array. =
The native Log4j 2.6 API has methods for up to ten unrolled parameters.<br>
<br>
Another consideration is that the native Log4j 2 API lets you log Objects, =
not just Strings. Any Object that implements CharSequence can be logged wit=
hout creating garbage.<br>
<br>
You can also implement the log4j Message interface if you want to separate =
formatting from your business domain objects.<br>
<br>
Finally, the native Log4j 2 API has support for logging Java 8 lambdas (sin=
ce 2.4).<br>
<br>
&gt; 2. when do you expect=C2=A0log4j 2.6=C2=A0to be released GA i.e. ready=
 for production use?<br>
<br>
Barring any showstoppers, I expect it will be available in a week or so.<br=
><br>
</blockquote></div>
</blockquote></div></div>
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