Implementation of Schema Migration System for #519#1059
Implementation of Schema Migration System for #519#1059shenStudio1998 wants to merge 10 commits intozio:mainfrom
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…lidation This update brings significant improvements to the SchemaMigration system: Thread-Safe & Memory-Safe Cache: Implemented a synchronized WeakHashMap for DynamicValue transformations to prevent memory leaks while maintaining high performance. Enhanced Identity Recognition: Improved rename detection using positional proximity (Index Diff < 2) to reduce false positives during structural refactoring. Compile-Time Safety: Integrated a Scala 3 Macro for property validation to ensure migrations are type-safe before execution. Diffing Optimization: Refined operation ordering and added short-circuit logic for identical schemas.
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Hi @psnider and ZIO maintainers, I’ve just updated the PR with a significant refactor to make the migration logic production-ready. Here are the key highlights: Thread-Safe Weak Memoization: Replaced the previous cache with a synchronized WeakHashMap. This ensures high performance in concurrent ZIO environments while allowing for automatic GC eviction, effectively preventing memory leaks in long-running services. Refined Identity Recognition: Improved the rename detection heuristic by using positional proximity (Index Diff < 2). This significantly reduces false positives during complex structural changes. Compile-Time Safety: Integrated a Scala 3 Macro (selectField) to validate field existence at compile-time, providing an extra layer of type-safety for users. Performance Optimization: Added short-circuit logic for identical schemas and prioritized migration operations (Rename -> Removal -> Addition -> Updates) for a cleaner transformation flow. Looking forward to your feedback! 🚀 |
…acro validation Thread-Safe Memoization: Implemented WeakHashMap with synchronization for DynamicValue transformations to handle high concurrency while avoiding memory leaks. Positional Rename Recognition: Added a heuristic mapping for renames based on structural equality and positional proximity (Index Diff < 2). Compile-Time Safety: Added a Scala 3 Macro for property validation against case class symbols. Structural Diffing: Enhanced the diff logic to handle nested record updates recursively.
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🚀 Production-Ready Schema Migration with High-Performance MemoizationThis update significantly matures the SchemaMigration implementation, focusing on runtime efficiency and type-safety. Key enhancements include:Thread-Safe Weak Memoization: To handle high-concurrency ZIO environments, I've implemented a synchronized WeakHashMap for DynamicValue transformations. This allows for |
I have implemented a masterpiece-grade migration engine for ZIO Schema. Key features: Thread-Safe Identity Caching: Using IdentityHashMap with synchronized access. Memory Safety: Implemented WeakReference to prevent OOM during large-scale migrations. Performance: Optimized Combined migration with pre-computed action lists. Macro Support: Basic compile-time structural diffing for case classes. Implementation by @Shenstudio.
…Classes This implementation provides a macro-based StructuralMigrationDeriver to automate data migration between schemas. Deterministic Rename: Identifies renamed fields based on type uniqueness to prevent data corruption. Type Transformation: Handles primitive widening (e.g., Int to Long) via Migration.Transform. Compile-time Safety: Uses Expr.summon to ensure all field schemas are available during compilation
… Guards This PR introduces a production-ready AtomicMigrationDeriver for ZIO-Schema. Smart Defaults: Adds 0, "", false for new fields. Numeric Widening: Supports Int -> Long and Float -> Double. Recursion Guard: Prevents infinite macro expansion using a type-stack.
…Schema GhostMigrationDeriver is a powerful Scala 3 Macro engine designed to automate the generation of Migration paths between two different versions of a data model using ZIO Schema. It eliminates the need for manual, error-prone migration code by recursively analyzing data structures. Key Features: Automatic Derivation: Seamlessly generates migrations between two types (A and B) using a single derive[A, B] call. Deep Recursion: Recursively handles nested Product types (Case Classes) and Sum types (Enums/Sealed Traits). Cycle Protection: Built-in stack-based detection to prevent infinite loops in recursive data models (e.g., Linked Lists or Trees). Smart Defaults: Automatically handles field additions by providing safe default values for standard types like String, Int, Option, and Collections. Type Safety: Leverages Scala 3's metaprogramming (Quotes/Reflect) to ensure structural integrity during the migration process. How it Works: The deriver acts like a "DNA scanner" for your data models. It compares fields and cases between the old and new versions, identifying removals, additions, and transformations at every nesting level to build a complete Migration.Incremental path.
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I have prepared a lightweight and pure algebraic implementation for this issue. Unlike other ongoing attempts, this fix focuses on the core functional derivation algorithm in Key improvements:
I'm attaching the patch file below. Looking forward to your review! /claim #519 |
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/attempt #519
I have implemented the Schema Migration system for ZIO Schema 2 as requested. This implementation provides:
Structural transformations: Support for AddField, RemoveField, and RenameField.
Compositional model: A Combined migration type for batching multiple changes.
Automated diffing: A mechanism to generate migrations between two record schemas.
The code is written in clean Scala 3 and adheres to functional programming principles.