java / expert
Snippet
Efficient Stack Walking with StackWalker API
The StackWalker API is a performance-oriented way to inspect the call stack. Unlike Throwable.getStackTrace(), it provides a stream-based approach that lazily fetches only the required frames, making it ideal for high-performance logging or security checks.
snippet.java
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StackWalker walker = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);Optional<String> caller = walker.walk(frames ->frames.skip(1).findFirst().map(StackWalker.StackFrame::getClassName));
Breakdown
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StackWalker walker = StackWalker.getInstance(...);
Creates a walker instance with specific options like retaining class references.
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frames -> frames.skip(1).findFirst()
Uses the Stream API to efficiently locate the direct caller of the current method.