Added new Map trait that replaces LockMap #60
Conversation
WalkthroughThe changes involve updates to the project's Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Mutex
participant MapTrait
participant TryMapTrait
participant LockError
User->>Mutex: Request lock
Mutex->>User: Return MutexGuard
User->>MapTrait: Call map with closure
MapTrait->>User: Return mapped value
User->>TryMapTrait: Call try_map with closure
TryMapTrait->>Mutex: Attempt to lock
Mutex-->>TryMapTrait: Lock success
TryMapTrait->>User: Return Ok(mapped value)
Mutex-->>TryMapTrait: Lock failure
TryMapTrait->>LockError: Create LockError
TryMapTrait->>User: Return Err(LockError)
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Actionable comments posted: 3
🧹 Outside diff range and nitpick comments (4)
src/traits/map/mutex.rs (1)
13-16: Consider implementing more standard traits forLockError.The
LockErrorstruct currently derivesDebugand implements theErrortrait viathiserror. For better usability, especially when handling errors, consider deriving or implementing additional standard traits such asClone,Copy,PartialEq, andEqif appropriate.src/traits/mod.rs (1)
9-9: Missing documentation for the newmapmodule.The newly added
mapmodule lacks module-level documentation. Adding a brief description will help users understand its purpose and how it fits into the crate's overall functionality.Apply this change to add documentation:
pub mod truncate; +/// Provides generalized mapping traits for various types. +/// Mainly used for mapping operations on Mutex types. pub mod map;src/traits/lock.rs (1)
1-4: Deprecated traitLockMapshould guide users to transition smoothly.The
LockMaptrait is deprecated with a note to usemap::Mapinstead. To aid users in transitioning, consider providing examples or documentation on how to migrate existing code fromLockMaptomap::Map.src/traits/map.rs (1)
30-41: Remove commented-out code or provide justification.There is a block of commented-out code that attempts to implement
TryMapusingMap. If this code is not intended for use soon, consider removing it to keep the codebase clean. If it is meant for future use, provide a comment explaining its purpose.
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (5)
Cargo.toml(1 hunks)src/traits/lock.rs(1 hunks)src/traits/map.rs(1 hunks)src/traits/map/mutex.rs(1 hunks)src/traits/mod.rs(2 hunks)
🔇 Additional comments (3)
src/traits/map/mutex.rs (1)
22-32:
Potential deadlock in try_map method for parking_lot::Mutex.
The try_map method uses self.try_lock(), which may return None if the mutex is already locked by the current thread, leading to a potential deadlock scenario if not properly handled. Ensure that the implementation accounts for recursive locking if parking_lot::Mutex is not configured for recursion.
Run the following script to check if parking_lot::Mutex is configured for recursive locking:
src/traits/mod.rs (1)
24-24: Ensure consistent re-exporting in the prelude.
While the map module is publicly re-exported in the prelude, verify that all necessary items within the map module are appropriately exposed. This ensures that users importing the prelude have access to the new Map and TryMap traits.
Run the following script to list all public items in the map module:
✅ Verification successful
Re-exports in prelude are correctly configured
The verification confirms that both Map and TryMap traits are public items in the map module, and they are being correctly re-exported via pub use super::map::*; in the prelude. This ensures that users importing the prelude will have access to both traits.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: List all public items in the `map` module to ensure they are re-exported.
# Expected result: Map and TryMap traits should be listed.
rg '^pub (trait|struct|enum|fn)' src/traits/map.rs
Length of output: 146
Cargo.toml (1)
23-23: Verify the necessity of optional dependency parking_lot.
Ensure that adding parking_lot as an optional dependency aligns with the project's goals and that the benefits outweigh the added complexity. Verify that the crate is used effectively in the codebase.
Run the following script to find all uses of parking_lot:
✅ Verification successful
Let me gather more context about how this optional dependency is configured and used.
The use of parking_lot as an optional dependency is justified and well-implemented
The codebase demonstrates proper usage of parking_lot as an optional dependency:
- It's used to implement mutex-related traits (
Map,TryMap,FlipImmut) behind feature flags - The implementation is properly isolated using
#[cfg(feature = "parking_lot")]attributes - It's part of the traits functionality but not required for core features
- There are tests specifically for the parking_lot mutex implementation
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Find all occurrences of `parking_lot` in the codebase.
# Expected result: Usages should be found in mutex implementations.
rg 'parking_lot' src/
Length of output: 1459
Script:
#!/bin/bash
# Check the feature configuration in Cargo.toml
cat Cargo.toml
# Check if there are any conditional compilation blocks for parking_lot
rg '#\[cfg\(.*parking_lot.*\)\]' -A 5
Length of output: 3700
| fn try_map<F, U>(&'a self, f: F) -> Result<U, LockError> | ||
| where | ||
| F: FnOnce(parking_lot::MutexGuard<'g, T>) -> U, | ||
| 'a: 'g, | ||
| { | ||
| match self.try_lock() { | ||
| Some(guard) => Ok(f(guard)), | ||
| None => Err(LockError), | ||
| } | ||
| } | ||
| } |
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🛠️ Refactor suggestion
Inconsistent error handling between parking_lot::Mutex and std::sync::Mutex.
The try_map method for parking_lot::Mutex returns a custom LockError, whereas the try_map method for std::sync::Mutex returns std::sync::TryLockError. This inconsistency can lead to confusion and complicate error handling for users working with both mutex types. Consider standardizing the error types by either:
- Returning
std::sync::TryLockErrorin both implementations, or - Defining a common error trait or enum to encapsulate different locking errors.
| pub trait TryMap<'a, 'g, T: ?Sized, G: 'g, E = G> { | ||
| /// Maps a value of T to a value of U | ||
| /// | ||
| /// # Errors | ||
| /// - Locking the mutex failed | ||
| fn try_map<F, U>(&'a self, f: F) -> Result<U, E> | ||
| where | ||
| F: FnOnce(G) -> U + 'g, | ||
| 'a: 'g; | ||
| } |
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🛠️ Refactor suggestion
Clarify the default error type E in TryMap trait.
The TryMap trait defines a default type parameter E = G, which may not be immediately clear to users. Since G represents a guard type, using it as an error type could be confusing. Consider defining a more explicit error type or providing additional documentation on the intended usage.
Apply this change to clarify the error type:
- pub trait TryMap<'a, 'g, T: ?Sized, G: 'g, E = G> {
+ pub trait TryMap<'a, 'g, T: ?Sized, G: 'g, E> {And update implementations accordingly.
Committable suggestion skipped: line range outside the PR's diff.
| @@ -20,6 +20,7 @@ members = ["quork-proc"] | |||
| [dependencies] | |||
| cfg-if = "1.0" | |||
| lock_api = { version = "0.4", optional = true } | |||
| parking_lot = { version = "0.12", optional = true } | |||
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🛠️ Refactor suggestion
Add feature flag for parking_lot dependency.
The parking_lot crate is added as an optional dependency but does not have an associated feature flag. To allow users to enable or disable this dependency, consider adding a feature flag.
Apply this change to define a feature for parking_lot:
[features]
parking_lot = ["parking_lot"]And update conditional compilation in the codebase accordingly.
Summary by CodeRabbit
New Features
parking_lot, enhancing concurrency control.MapandTryMaptraits for improved mapping functionality with Mutex types.mapandtry_mapmethods forparking_lot::Mutexandstd::sync::Mutex.Deprecation
LockMaptrait as deprecated, advising users to transition to themap::Maptrait.Documentation