[slf4j-dev] [GIT] SLF4J: Simple Logging Facade for Java branch, master, updated. v_1.6.1-11-gd5118ad
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- Log -----------------------------------------------------------------
http://git.qos.ch/gitweb/?p=slf4j.git;a=commit;h=d5118ad23879d7ac029a93e5aeac8f674c693005
http://github.com/ceki/slf4j/commit/d5118ad23879d7ac029a93e5aeac8f674c693005
commit d5118ad23879d7ac029a93e5aeac8f674c693005
Merge: b2ade38 db5d1d0
Author: Ceki Gulcu <ceki at qos.ch>
Date: Wed Oct 13 20:50:29 2010 +0200
Merge branch 'master' of git.qos.ch:slf4j
http://git.qos.ch/gitweb/?p=slf4j.git;a=commit;h=b2ade3805516d849ed30d048e0657910ea1a3239
http://github.com/ceki/slf4j/commit/b2ade3805516d849ed30d048e0657910ea1a3239
commit b2ade3805516d849ed30d048e0657910ea1a3239
Author: Ceki Gulcu <ceki at qos.ch>
Date: Wed Oct 13 20:50:14 2010 +0200
minor editing
diff --git a/slf4j-site/src/site/pages/legacy.html b/slf4j-site/src/site/pages/legacy.html
index 7623b9d..0608366 100644
--- a/slf4j-site/src/site/pages/legacy.html
+++ b/slf4j-site/src/site/pages/legacy.html
@@ -28,7 +28,13 @@
to behave as if they were made to the SLF4J API instead. The
figure below illustrates the idea.
</p>
-
+
+ <p>Please note that for source code under your control, you really
+ should use the <a href="migrator.html">slf4j-migrator</a>. The
+ binary-based solutions described in this page are appropriate for
+ software beyond your control.
+ </p>
+
<p></p>
<p></p>
@@ -112,8 +118,7 @@
</p>
- <h3><a name="log4j-over-slf4j" href="#log4j-over-slf4j">Log4j over
- SLF4J</a></h3>
+ <h3><a name="log4j-over-slf4j" href="#log4j-over-slf4j">log4j-over-slf4j</a></h3>
<p>SLF4J ship with a module called <em>log4j-over-slf4j</em>. It
allows log4j users to migrate existing applications to SLF4J without
@@ -143,7 +148,7 @@
<p>In most situations, replacing a jar file is all it takes in
order to migrate from log4j to SLF4J.
</p>
-
+
<p>Note that as a result of this migration, log4j configuration
files will no longer be picked up. If you need to migrate your
log4j.properties file to logback, the <a
@@ -156,15 +161,15 @@
<p>The <em>log4j-over-slf4j</em> module will not work when the
application calls log4j components that are not present in the
- bridge. For example, direct references to log4j appenders,
- filters or PropertyConfigurator are not supported by
- log4j-over-slf4j. While the number of cases where
- log4j-over-slf4j is insufficient is not completely negligible, in
- the vast majority of cases where log4j is configured through a
- configuration file, be it <em>log4j.properties</em> or
- <em>log4j.xml</em>, log4j-over-slf4j is enough in order to migrate
- your application to SLF4J.
+ bridge. For example, when application code directly references
+ log4j appenders, filters or the PropertyConfigurator, then
+ log4j-over-slf4j would be an insufficient replacement for
+ log4j. However, when log4j is configured through a configuration
+ file, be it <em>log4j.properties</em> or <em>log4j.xml</em>, the
+ log4j-over-slf4j module should just work fine.
</p>
+
+
<h4>What about the overhead?</h4>
@@ -193,35 +198,46 @@
log4j, and log4j calls redirected to SLF4j, resulting in an <a
href="codes.html#log4jDelegationLoop">endless loop</a>.
</p>
+
+
- <h3><a name="jul-to-slf4j" href="jul-to-slf4j">JUL to SLF4J</a></h3>
+ <h3><a name="jul-to-slf4j" href="#jul-to-slf4j">jul-to-slf4j bridge</a></h3>
- <p>The jul-to-slf4j module includes a jul handler, namely
- SLF4JBridgeHandler, that routes all incoming jul records to the
- SLF4j API. Please see <a
+ <p>The jul-to-slf4j module includes a java.util.logging (jul)
+ handler, namely <code>SLF4JBridgeHandler</code>, which routes all
+ incoming jul records to the SLF4j API. Please see <a
href="api/org/slf4j/bridge/SLF4JBridgeHandler.html">SLF4JBridgeHandler
- javadocs</a> for usage instructions.
+ javadocs</a> for usage instructions.
</p>
- <p>Contrary to other bridging modules such as jcl-over-slf4j and
- log4j-over-slf4j, which re-implement JCL and respectively log4j,
- the jul-to-slf4j modules does not re-implement the
- java.util.logging package because packages under the java.*
- namespace cannot be replaced. Instead, translates <a
+ <p>Contrary to other bridging modules, namely jcl-over-slf4j and
+ log4j-over-slf4j, which reimplement JCL and respectively log4j,
+ the jul-to-slf4j module does not reimplement the java.util.logging
+ because packages under the java.* namespace cannot be
+ replaced. Instead, jul-to-slf4j translates <a
href="http://java.sun.com/j2se/1.5.0/docs/api/java/util/logging/LogRecord.html?is-external=true">LogRecord</a>
- object into its SLF4J equivalent on each logging event. Please
- note this traslation process incurs the cost of constructing a
- <code>LogRecord</code> instance regardless of whether the SLF4J
- logger is disabled for the given level or nor. <b>Consequently,
- j.u.l. to SLF4J translation can seriously impact on the cost of
- disabled logging statements (60 fold increase) and a measurable
- impact on enabled log statements (20% overall increase).</b>
+ objects into their SLF4J equivalent. Please note this traslation
+ process incurs the cost of constructing a <code>LogRecord</code>
+ instance regardless of whether the SLF4J logger is disabled for
+ the given level or nor. <b>Consequently, j.u.l. to SLF4J
+ translation can seriously impact on the cost of disabled logging
+ statements (60 fold increase) and a measurable impact on enabled
+ log statements (20% overall increase).</b> Please note that as of
+ logback-version 0.9.25, it is possible to completely eliminate the
+ 60 fold translation overhead for disabled log statements with the
+ help of <a
+ href="http://logback.qos.ch/manual/configuration.html#LevelChangePropagator">LevelChangePropagator</a>.
</p>
- <p>If application performance is a concern, then use of
- SLF4JBridgeHandler is appropriate only if few j.u.l. logging
- statements are in play. </p>
-
+ <p>If you are concerned about application performance, then use of
+ <code>SLF4JBridgeHandler</code> is appropriate only if one the
+ following two conditions is true:
+ </p>
+ <ol>
+ <li>few j.u.l. logging statements are in play </li>
+ <li><code>LevelChangePropagator</code> has been installed</li>
+ </ol>
+
<h4>jul-to-slf4j.jar and slf4j-jdk14.jar cannot be present
simultaneously
diff --git a/slf4j-site/src/site/pages/templates/left.js b/slf4j-site/src/site/pages/templates/left.js
index 7411c29..6df2bdf 100644
--- a/slf4j-site/src/site/pages/templates/left.js
+++ b/slf4j-site/src/site/pages/templates/left.js
@@ -33,8 +33,6 @@ document.write(' </p>');
document.write('</div>');
-//document.write('<p> </p>');
-//document.write('<p class="survey">Take our <a href="http://ceki.questionform.com/public/slf4j">two question survey</a>.</p>');
document.write('<p> </p>');
document.write('<p class="pub">');
document.write(' <a href="https://www.qos.ch/shop/products/log4jManual">');
-----------------------------------------------------------------------
Summary of changes:
slf4j-site/src/site/pages/legacy.html | 82 ++++++++++++++++-----------
slf4j-site/src/site/pages/templates/left.js | 2 -
2 files changed, 49 insertions(+), 35 deletions(-)
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