garydgregory commented on a change in pull request #698:
URL: https://github.com/apache/logging-log4j2/pull/698#discussion_r785020969



##########
File path: 
log4j-to-jul/src/main/java/org/apache/logging/log4j/tojul/LazyLog4jLogRecord.java
##########
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache license, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the license for the specific language governing permissions and
+ * limitations under the license.
+ */
+package org.apache.logging.log4j.tojul;
+
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
+import org.apache.logging.log4j.util.StackLocatorUtil;
+
+/**
+ * Extension of {@link java.util.logging.LogRecord} with lazy get source 
related methods based on Log4j's {@link StackLocatorUtil#calcLocation(String)}.
+ *
+ * @author <a href="http://www.vorburger.ch";>Michael Vorburger.ch</a> for 
Google
+ */
+/* package-local */ final class LazyLog4jLogRecord extends LogRecord {
+
+    private static final long serialVersionUID = 6798134264543826471L;
+
+    // parent class LogRecord already has a needToInferCaller but it's private
+    private transient boolean stillNeedToInferCaller = true;
+
+    private final String fqcn;
+
+    LazyLog4jLogRecord(String fqcn, Level level, String msg) {
+        super(level, msg);
+        this.fqcn = fqcn;
+    }
+
+    @Override
+    public String getSourceClassName() {
+        if (stillNeedToInferCaller) {
+            inferCaller();
+        }
+        return super.getSourceClassName();
+    }
+
+    @Override
+    public String getSourceMethodName() {
+        if (stillNeedToInferCaller) {
+            inferCaller();
+        }
+        return super.getSourceMethodName();
+    }
+
+    private void inferCaller() {

Review comment:
       Should this be synchronized to avoid extra work?




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