feat : 모델 장바구니 조회 PR #9
Conversation
WalkthroughThe pull request introduces cart functionality to the Changes
Sequence DiagramsequenceDiagram
participant User
participant CartController
participant ModelRepository
User->>CartController: addToCart(userId, modelId)
CartController->>ModelRepository: getById(modelId)
alt Model exists
ModelRepository-->>CartController: Return DataModel
CartController->>CartController: Add model to user's cart
CartController-->>User: Return updated cart list
else Model does not exist
ModelRepository-->>CartController: Return empty
CartController-->>User: Return empty list
end
User->>CartController: getCart(userId)
CartController-->>User: Return user's cart items
Poem
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Actionable comments posted: 2
🧹 Nitpick comments (3)
src/main/java/com/example/redunm/modellist/DataModelCartController.java (3)
6-6: Consider avoiding wildcard imports.
Using wildcard imports can introduce potential namespace collisions and can make the code less readable because it’s unclear which classes are actually in use.If you only need a few classes from java.util, consider importing them explicitly.
53-55: Return a meaningful error or status for non-existent models.
Returning an empty list could mislead clients into thinking there are no items in the cart, rather than indicating that the requested model was unavailable. A more explicit approach is to return a 404 status code or throw an exception.
60-64: Check for duplicate additions.
Currently, the cart can contain multiple entries of the same model if the user calls this endpoint repeatedly with the same model ID. This behavior is valid in some cart scenarios, but consider whether you want to prevent duplicates.
| * - key: 사용자 ID (문자열) | ||
| * - value: 해당 사용자가 장바구니에 담은 DataModel 리스트 | ||
| */ | ||
| private Map<String, List<DataModel>> userCartMap = new HashMap<>(); |
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Review concurrency implications of shared map usage.
Because userCartMap is a simple HashMap that is being modified, consider using a concurrent data structure or synchronizing access if multiple threads can call these endpoints simultaneously (which is common in a Spring Boot application).
For instance, switching to a thread-safe structure like ConcurrentHashMap could prevent race conditions.
-private Map<String, List<DataModel>> userCartMap = new HashMap<>();
+private Map<String, List<DataModel>> userCartMap = new ConcurrentHashMap<>();📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| private Map<String, List<DataModel>> userCartMap = new HashMap<>(); | |
| private Map<String, List<DataModel>> userCartMap = new ConcurrentHashMap<>(); |
| //장바구니 목록 조회 | ||
| @GetMapping("/cart/{userId}") | ||
| public List<DataModel> getCart(@PathVariable String userId) { | ||
| return userCartMap.getOrDefault(userId, Collections.emptyList()); | ||
| } |
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💡 Codebase verification
The verification reveals that userCartMap is implemented using a standard HashMap without any thread-safety mechanisms:
private Map<String, List<DataModel>> userCartMap = new HashMap<>();This implementation is not thread-safe and could lead to data races when:
- Multiple threads access
getOrDefaultandputoperations concurrently - The underlying
ArrayListis modified during cart updates
Recommendations:
- Replace
HashMapwithConcurrentHashMap - Consider using
Collections.synchronizedList()for the cart list - Alternatively, implement method-level synchronization using the
synchronizedkeyword
🔗 Analysis chain
Verify cart retrieval in concurrent scenarios.
Using the getCart method in parallel with addToCart on the same user ID might lead to unexpected results if underlying modifications are not thread-safe. Consider a concurrency strategy or a lightweight read-write lock.
Below is a shell script you could use to check for concurrency references in your codebase for better insights:
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Searching for concurrency-related annotations or logic in the project.
rg -A 5 "synchronized|volatile|ConcurrentHashMap|Lock|ReadWriteLock|@Async|@Scheduled"
Length of output: 88
Script:
#!/bin/bash
# Let's check the implementation of userCartMap to understand its thread-safety
ast-grep --pattern 'userCartMap'
# Also check for any Map initialization or declaration
rg -l "Map[<].*[>].*=.*new"
Length of output: 840
Pull Request
Summary by CodeRabbit
New Features
Bug Fixes