Logging Sensor

Logging Frameworks to be addressed

Log4J
java.util.logging
Apache Commons Logging
Logback (basically always used through SLF4J)

Facades

Mostly logging is not used directly but often used through a facade like SLF4J. In fact most tutorials on logback state that it has be used with SLF4J

Instrumentation

We need a method/methods that provide the following:

read the log level
read the log message
operate on as little methods as possible

Framework	Instrumentation point
log4J	log4j offers a nice central point where loggings of all levels are handled. This method is *org.apache.log4j.Category.forcedLog*
java.util.logging
Apache Commons Logging
Logback	Actuall instrumenting logback classic directly is not too nice. The class handling the logging is https://github.com/qos-ch/logback/blob/master/logback-classic/src/main/java/ch/qos/logback/classic/Logger.java which provides different internal logging methods for each level. There is no central place where the logging is handled independently of the loglevel. We would have to instrument a bunch of methods.
SLF4J	http://grepcode.com/file/repo1.maven.org/maven2/org.slf4j/slf4j-api/1.7.12/org/slf4j/Logger.java#Logger is an interface uses the http://grepcode.com/file/repo1.maven.org/maven2/org.slf4j/slf4j-api/1.7.12/org/slf4j/LoggerFactory.java#LoggerFactory.getILoggerFactory%28%29 to find a LoggingFactory to create a Logger. So in fact we just need to have a look at the concrete adaptors for the technologies: http://grepcode.com/file/repo1.maven.org/maven2/org.slf4j/slf4j-log4j12/1.7.12/org/slf4j/impl/Log4jLoggerAdapter.java?av=f for Log4J

Develop

Logging Sensor

Analytics

Logging Frameworks to be addressed

Facades

Instrumentation

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