Pin connections during transactions

[abnegate]

Summary by CodeRabbit

• New Features
  • Improved transaction handling to ensure all operations within a transaction use the same database connection.
• Refactor
  • Enhanced internal logic for managing database connections during transactions for greater reliability.

[coderabbitai]

Walkthrough

A private $pinned property is added to the Pool class to manage a single adapter instance during transactions. The delegate method is refactored to pin adapters for the duration of a transaction, ensuring all transaction-related calls use the same adapter. The pin is cleared upon transaction completion.

Changes

File	Change Summary
src/Database/Adapter/Pool.php	Added $pinned property and refactored delegate to support adapter pinning during transactions

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant Pool
    participant Adapter

    Client->>Pool: startTransaction()
    Pool->>Adapter: acquire adapter from pool
    Pool->>Pool: pin adapter
    Adapter-->>Pool: transaction started

    Client->>Pool: query/operation()
    Pool->>Adapter: use pinned adapter for operation

    Client->>Pool: commitTransaction()/rollbackTransaction()
    Pool->>Adapter: use pinned adapter
    Adapter-->>Pool: transaction ended
    Pool->>Pool: unpin adapter

Loading

Poem

A clever new pin for adapters appears,
Ensuring transactions stay crystal clear.
One bunny, one burrow, for each little hop—
No switching mid-leap until the transaction stops.
With paws on the pool, and logic refined,
The code now keeps adapters aligned!
🐇✨

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📜 Recent review details

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Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between aa0116b and 8c764ed.

📒 Files selected for processing (1)

• src/Database/Adapter/Pool.php (3 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (2)

• GitHub Check: Setup & Build Docker Image
• GitHub Check: CodeQL

🔇 Additional comments (3)

src/Database/Adapter/Pool.php (3)

18-23: LGTM: Property declaration is well-documented and correctly typed.

The private $pinned property is properly typed as nullable Adapter with clear documentation explaining its purpose for transaction pinning.

---

70-90: Good refactoring: Configuration logic extracted into reusable closure.

Extracting the adapter configuration logic into a closure improves code maintainability by eliminating duplication between the pinned and pooled adapter code paths.

---

92-107: Verify exception handling to prevent adapter leak during transactions.

The transaction pinning logic correctly pins adapters on startTransaction and unpins on commitTransaction/rollbackTransaction. However, if an exception occurs during a transaction before commit/rollback, the adapter may remain permanently pinned.

Consider implementing exception handling or a cleanup mechanism to reset the pinned adapter in error scenarios.

Let me verify if there are any existing exception handling patterns in the codebase:

#!/bin/bash
# Description: Check for exception handling patterns around transactions
# Expected: Find how exceptions are handled in transaction-related code

# Search for transaction-related exception handling
rg -A 5 -B 5 "Transaction.*Exception|Exception.*Transaction" --type php

# Search for try-catch blocks around transaction methods
rg -A 10 -B 2 "try.*startTransaction|try.*commitTransaction|try.*rollbackTransaction" --type php

# Check if there are any cleanup or destructor patterns
rg -A 5 "__destruct|cleanup.*transaction" --type php

✨ Finishing Touches

• 📝 Generate Docstrings

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