public final boolean isTraceEnabled() {

        return isLevelEnabled(SimpleLog.LOG_LEVEL_TRACE);
    }
<p>
Are trace messages currently enabled?


<p>
This allows expensive operations such as <code>String</code> concatenation
to be avoided when the message will be ignored by the logger.
jcl-over-slf4j/src/main/java/org/apache/commons/logging/impl/SimpleLog.java