Add 'domain' parameter to the Log4j 2.x agent
authorMichael Jeanson <mjeanson@efficios.com>
Thu, 10 Feb 2022 15:25:02 +0000 (15:25 +0000)
committerMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Mon, 21 Feb 2022 15:18:21 +0000 (10:18 -0500)
commit037040cb622ad9aabb2fdeb719b3cc167559bf2e
tree4d349c174e8dd0da2c7c23aed8cf9ee2d44381b3
parent784d97f6b03268cc2144106ebcd8239b3676a28c
Add 'domain' parameter to the Log4j 2.x agent

The initial Log4j 2.x agent commit only implemented a compatibility mode
to be used with the existing LOG4J domain in lttng-tools.

In this mode the agent converts the new Log4j 2.x loglevel values to
their corresponding Log4j 1.x values in the same way the upstream
compatibility bridge does.

This is great when doing in-place migration using the upstream
compatibility bridge but doesn't cover the usecase of an application
that natively uses Log4j 2.x.

This commit adds a new mandatory 'domain' parameter to the Log4j2 agent
which currently only implements the 'LOG4J' compatibility domain in
preparation to adding a 'LOG4J2' domain.

The configuration for a single appender in Log4j 1.x compat mode will
now look like this:

    <?xml version="1.0" encoding="UTF-8"?>
    <Configuration status="WARN">
      <Appenders>
        <Lttng name="LTTNG" domain="LOG4J"/>
      </Appenders>
      <Loggers>
        <Root level="all">
          <AppenderRef ref="LTTNG"/>
        </Root>
      </Loggers>
    </Configuration>

Change-Id: I7fd5f79ad58c77175714bd4198d8ff5db2e6b846
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
doc/examples/java-log4j2-basic/log4j2.xml
doc/examples/java-log4j2-ctx/log4j2.ctx1.xml
doc/examples/java-log4j2-ctx/log4j2.ctx2.xml
doc/examples/java-log4j2-prog/HelloLog4j2Prog.java
src/lib/lttng-ust-java-agent/java/lttng-ust-agent-log4j2/org/lttng/ust/agent/log4j2/LttngLogAppender.java
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