carterkozak commented on a change in pull request #284: LOG4J2-2639 - Allow 
logging calls to be constructed using a builder pattern
URL: https://github.com/apache/logging-log4j2/pull/284#discussion_r296490927
 
 

 ##########
 File path: 
log4j-api/src/main/java/org/apache/logging/log4j/spi/AbstractLogger.java
 ##########
 @@ -2734,4 +2748,108 @@ public void warn(final String message, final Object 
p0, final Object p1, final O
             final Object p7, final Object p8, final Object p9) {
         logIfEnabled(FQCN, Level.WARN, null, message, p0, p1, p2, p3, p4, p5, 
p6, p7, p8, p9);
     }
+
+    /**
+     * Constuct a trace log event.
+     * @return a LogBuilder.
+     * @since 3.0
+     */
+    @Override
+    public  LogBuilder atTrace() {
+        if (isTraceEnabled()) {
+            return logBuilder.get().setLevel(Level.TRACE);
 
 Review comment:
   I think we need something similar to `ReusableParameterizedMessage.reserved` 
for this to work, otherwise we will clobber threadlocal state with something 
like this:
   
   ```java
   private void func() {
     log.atInfo().withMessage("Value {}").withParameters(getValue()).log();
   }
   
   private Object getValue() {
       log.atInfo().withMessage("Getting Value").log();
       return value;
   }
   ```

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