carterkozak commented on a change in pull request #289: LOG4J2-2644 - Improve 
performance of getting location info
URL: https://github.com/apache/logging-log4j2/pull/289#discussion_r299084747
 
 

 ##########
 File path: 
log4j-api-java9/src/main/java/org/apache/logging/log4j/util/StackLocator.java
 ##########
 @@ -72,15 +75,38 @@ private StackLocator() {
     }
 
     public StackTraceElement calcLocation(final String fqcnOfLogger) {
-        return stackWalker.walk(
-                s -> s.dropWhile(f -> !f.getClassName().equals(fqcnOfLogger)) 
// drop the top frames until we reach the logger
-                        .dropWhile(f -> f.getClassName().equals(fqcnOfLogger)) 
// drop the logger frames
-                        .findFirst())
-                .get()
-                .toStackTraceElement();
+        return 
walker.walk(LOCATOR.get().setFqcn(fqcnOfLogger)).toStackTraceElement();
     }
 
     public StackTraceElement getStackTraceElement(final int depth) {
         return stackWalker.walk(s -> 
s.skip(depth).findFirst()).get().toStackTraceElement();
     }
+
+    static final class FqcnCallerLocator implements 
Function<Stream<StackWalker.StackFrame>, StackWalker.StackFrame> {
+
+        private String fqcn;
+
+        public FqcnCallerLocator setFqcn(String fqcn) {
+            this.fqcn = fqcn;
+            return this;
+        }
+
+        @Override
+        public StackWalker.StackFrame apply(Stream<StackWalker.StackFrame> 
stackFrameStream) {
+            boolean foundFqcn = false;
+            Object[] frames = stackFrameStream.toArray();
 
 Review comment:
   I see, I didn't realize it was chunked internally, that's great! It's 
unfortunate that streams don't JIT very well compared to standard 
loops/iterators, the array sounds like the way to go if it performs better than 
the fluent stream approach.

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