tnt4j-logback

Logback Appender for TNT4J.

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NOTE: tnt4j-logback version 0.5.0 migrated to Java 11.

Latest Java 8 compliant tnt4j-logback version is 0.3.x.

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Logback Appender

All Logback messages can be routed to TNT4J event sinks via com.jkoolcloud.tnt4j.logger.logback.TNT4JAppender, which allows developers to send event messages to TNT4J.

Developers may also enrich event messages and pass context to TNT4J using hashtag enrichment scheme. Hashtags are used to decorate event messages with important metadata about each log message. This metadata is used to generate TNT4J tracking events:

logger.info("Starting a TNT4J activity #beg=Test");
logger.warn("First log message #app=" + LogbackTest.class.getName() + " #msg='1 Test warning message'");
logger.error("Second log message #app=" + LogbackTest.class.getName() + " #msg='2 Test error message'", new Exception("test exception"));
logger.info("Ending a TNT4J activity #end= #app=" + LogbackTest.class.getName());

Above example groups messages between first and last into a related logical collection called Activity. Activity is a collection of logically related events/messages. Hashtags #beg, #end are used to demarcate activity boundaries. This method also supports nested activities.

User defined fields can be reported using #[data-type][:value-type]/your-metric-name=your-value convention (e.g. #%i/order-no=62627 or #%d:currency/amount=50.45). TNT4JAppender supports the following optional data-type qualifiers:

	%i/ -- integer
	%l/ -- long
	%d/ -- double
	%f/ -- float
	%b/ -- boolean
	%n/ -- number
	%s/ -- string

All value-type qualifiers are defined in com.jkoolcloud.tnt4j.core.ValueTypes. Examples:

	currency 	-- generic currency
	flag 		-- boolean flag
	age 		-- age in time units
	guid 		-- globally unique identifier
	guage		-- numeric gauge
	counter		-- numeric counter
	percent		-- percent
	timestamp	-- timestamp
	addr 		-- generic address

Not specifying a qualifier defaults to auto-detection of type by TNT4JAppender. First number qualifier is tested and defaults to string if the test fails (e.g. #order-no=62627). User defined fields are reported as a TNT4J snapshot with Logback category and snapshot name set to activity name set by #beg, #end, #opn tags.

Below are Logback appender configuration attributes with defaults:

appender.class=com.jkoolcloud.tnt4j.logger.logback.TNT4JAppender
SourceName=com.logback
SourceType=APPL
MetricsOnException=true
MetricsFrequency=60

TNT4J Command line options

Command line arguments:

• -Dtnt4j.config=config/tnt4j.properties -- TNT4J configuration used by Logback appender
• -Dtnt4j.dump.on.vm.shutdown=true java property allows application state dumps generated automatically upon VM shutdown.
• -Dtnt4j.dump.provider.default=true java property registers all default dump providers (memory, stack, logging stats).
• -Dtnt4j.formatter.json.newline=true java property directs JSONFormatter to append new line when formatting log entries.

See <timestamp>.log and <vmid>.dump file for output produced by running your applications with this appender.

See config/tnt4j.properties for TNT4J configuration: factories, formatters, listeners, etc.

How to Build tnt4j-logback

Requirements

• JDK 11+

tnt4j-logback depends on the following external packages:

• TNT4J-API
• Logback Project

Please use JCenter or Maven and these dependencies will be downloaded automatically.

tnt4j-logback requires TNT4J. You will therefore need to point TNT4J to it's property file via the -Dtnt4j.config argument. This property file is located here in GitHub under the /config directory. If using JCenter or Maven, it can be found in the zip assembly along with the source code and javadoc.