Issue #34 Implement Refined JUL Logging Strategy with ERROR/PERFORMAN… #36
Conversation
…CE Prefixes - Convert ALL logging to lambda expressions for zero runtime overhead - Add 'ERROR:' prefix to SEVERE level messages for cloud monitoring compatibility - Add 'PERFORMANCE WARNING:' prefix for performance threshold issues - Use consistent hierarchical logger naming (fully-qualified class names) - Follow Oracle's JUL level hierarchy with proper target-audience mapping Changes: - JsonSchema.java: Added performance monitoring for validation stack depth - ApiTracker.java: Updated all logging calls to use lambda expressions with ERROR prefixes - JsonTestSuiteSummary.java: Converted warning calls to lambda expressions - JsonTestSuiteTest.java: Updated logging to use lambda expressions - RobustCharDecoder.java: Converted all fine-level logging to lambda expressions All tests pass: ./mvnw test
There was a problem hiding this comment.
Pull Request Overview
This PR implements a refined JUL (Java Util Logging) strategy to improve logging consistency and performance monitoring across the JSON API codebase. The changes focus on converting all logging to lambda expressions for zero runtime overhead while adding standardized prefixes for better cloud monitoring compatibility.
Key changes include:
- Conversion of all logging statements to lambda expressions to avoid string concatenation overhead when logging is disabled
- Addition of "ERROR:" prefixes to SEVERE level messages and "PERFORMANCE WARNING:" prefixes for performance-related alerts
- Implementation of validation stack depth monitoring in JsonSchema with configurable thresholds
Reviewed Changes
Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.
Show a summary per file
| File | Description |
|---|---|
| JsonSchema.java | Added performance monitoring for validation stack depth with warning thresholds and converted logging to lambda expressions |
| ApiTracker.java | Updated all logging calls to use lambda expressions with ERROR prefixes for severe messages |
| JsonTestSuiteTest.java | Converted warning logging calls to lambda expressions |
| RobustCharDecoder.java | Converted all fine-level logging to lambda expressions |
| JsonTestSuiteSummary.java | Converted warning calls to lambda expressions |
Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.
| final int stackDepthWarningThreshold = 1000; | ||
| final java.util.concurrent.atomic.AtomicInteger maxStackDepth = new java.util.concurrent.atomic.AtomicInteger(0); |
There was a problem hiding this comment.
Using AtomicInteger for tracking stack depth introduces unnecessary atomic operations overhead in single-threaded validation. Consider using a simple int variable instead since validation is not performed concurrently.
| int currentStackSize = stack.size(); | ||
| maxStackDepth.updateAndGet(current -> Math.max(current, currentStackSize)); |
There was a problem hiding this comment.
The updateAndGet operation with lambda is called on every validation frame pop, creating performance overhead. Since this is single-threaded, use a simple Math.max assignment with a primitive int variable.
|
|
||
| while (!stack.isEmpty()) { | ||
| ValidationFrame frame = stack.pop(); | ||
| LOG.finest(() -> "POP " + frame.path() + | ||
| int currentStackSize = stack.size(); | ||
| maxStackDepth.updateAndGet(current -> Math.max(current, currentStackSize)); | ||
|
|
||
| if (currentStackSize > stackDepthWarningThreshold) { | ||
| LOGGER.fine(() -> "PERFORMANCE WARNING: Validation stack depth exceeds recommended threshold: " + currentStackSize); |
There was a problem hiding this comment.
This warning will be logged repeatedly for every frame when the stack exceeds the threshold, potentially creating log spam. Consider logging this warning only once per validation or implementing a throttling mechanism.
| final int finalMaxStackDepth = maxStackDepth.get(); | ||
| if (finalMaxStackDepth > 100) { | ||
| LOGGER.fine(() -> "PERFORMANCE WARNING: Maximum validation stack depth reached: " + finalMaxStackDepth); | ||
| } |
There was a problem hiding this comment.
The magic number 100 should be extracted as a named constant. Also, consider using the same threshold variable (stackDepthWarningThreshold = 1000) for consistency, or clearly document why different thresholds are needed.
…CE Prefixes
Changes:
closes #35