Feature/incoporate ring buffer and friends #96
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- RingBuffer: Lock-free circular buffer with atomic operations - RingBufferStatistics: Immutable statistics snapshot record - StripedRingBuffer: Multi-stripe buffer for reduced thread contention - Comprehensive test coverage for all implementations - Fixed TextSplitterTest compilation error (valueOf with boolean) These components were migrated from cui-jwt-validation project to consolidate concurrent utilities in cui-java-tools. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
- Reorder imports according to project conventions - No functional changes, only import organization - Automatically applied by OpenRewrite during pre-commit 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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Summary of Changes
Hello @cuioss, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces a suite of high-performance, lock-free concurrent data structures designed for efficient measurement recording and statistics aggregation. It provides a foundational RingBuffer for circular data storage, an immutable RingBufferStatistics record for data snapshots, and a StripedRingBuffer for highly concurrent, low-contention operations, all aimed at improving performance monitoring capabilities. Additionally, it includes minor code style cleanups across existing files.
Highlights
- New Concurrent Data Structures: Implemented
RingBuffer, a high-performance, lock-free circular buffer using atomic operations and power-of-2 sizing for optimal performance in high-frequency write scenarios, particularly for measurement recording. - Scalable Concurrency: Introduced
StripedRingBuffer, which leverages multiple independentRingBufferinstances to minimize contention in multi-threaded environments. It distributes measurements across stripes based on thread hash codes, enhancing scalability. - Immutable Statistics: Added
RingBufferStatistics, a Java record providing an immutable snapshot of aggregated measurements (total sum and sample count) from the ring buffers, designed for safe and consistent access in concurrent contexts. - Comprehensive Testing: Included dedicated unit tests for
RingBuffer,RingBufferStatistics, andStripedRingBufferto ensure correctness, robustness, and thread-safety, including scenarios involving concurrent writes and reads. - Code Style Improvements: Performed minor code style cleanups across various existing files, primarily consolidating static import statements (e.g.,
TimeUnitandAssertions) and simplifying boolean expressions in test classes for better readability.
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Code Review
This pull request introduces a high-performance, lock-free RingBuffer and a StripedRingBuffer for concurrent statistics collection. The implementation is well-documented and includes a comprehensive set of unit tests.
My review focuses on correctness and performance aspects of the new concurrent data structures. I've identified a critical thread-safety issue in RingBuffer due to non-atomic array access, and have suggested using AtomicLongArray to resolve it. I've also provided suggestions to improve the performance of StripedRingBuffer by using power-of-two sizing for stripes. Additionally, there's a minor correction for the README.adoc file.
src/main/java/de/cuioss/tools/concurrent/StripedRingBuffer.java
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src/main/java/de/cuioss/tools/concurrent/StripedRingBuffer.java
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- Fix typo in README.adoc header (ch= -> =) - Refactor RingBuffer to use AtomicLongArray for proper thread safety - Ensures atomic writes and reads without locks - Guarantees visibility across threads - Prevents torn writes on architectures where long isn't atomic - Maintains lock-free design with proper memory semantics - Clean up import statements in TextSplitterTest 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
- Make STRIPE_COUNT a power of 2 for efficient bitwise operations - Replace modulo operator with bitwise AND for stripe selection - Add nextPowerOfTwo() helper method - Improves performance in high-concurrency scenarios These optimizations address performance suggestions from code review. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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