[ISSUE #1293]🔥Rocketmq-client supports the AllocateMessageQueueStrategy algorithm-AllocateMessageQueueAveragelyByCircle🚀 #1312
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…gy algorithm-AllocateMessageQueueAveragelyByCircle🚀
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (7)
rocketmq-client/src/consumer/allocate_message_queue_strategy.rs (3)
22-24: LGTM! Consider enhancing documentation with examples.The trait design with
Send + Syncbounds is appropriate for concurrent usage in a message queue system. The naming follows Rust conventions.Consider adding a usage example in the trait documentation to help implementers understand the expected behavior:
/// Trait for allocating message queues to consumers in a consumer group. /// This trait is implemented by different strategies for message queue allocation. +/// +/// # Example +/// +/// ``` +/// use rocketmq_client::consumer::AllocateMessageQueueStrategy; +/// +/// struct RoundRobinStrategy; +/// +/// impl AllocateMessageQueueStrategy for RoundRobinStrategy { +/// // Implementation details... +/// } +/// ```
Line range hint
25-44: Document possible error cases in the allocate method.The method signature and parameter documentation are well-defined. However, users would benefit from knowing what errors they might encounter.
Consider adding error documentation:
/// # Returns /// -/// A `Result` containing a vector of allocated message queues or an error. +/// Returns `Ok(Vec<MessageQueue>)` with the allocated queues on success. +/// +/// # Errors +/// +/// Returns an error if: +/// - The consumer ID is not found in the consumer group +/// - The message queue list is empty +/// - The consumer group is empty
45-51: Document naming conventions for strategy names.The method signature using
'staticlifetime is appropriate. Consider documenting any naming conventions or constraints for strategy names.Consider enhancing the documentation:
/// Returns the name of the allocation strategy. /// +/// The name should be: +/// - Unique across all strategy implementations +/// - Lowercase with words separated by underscores +/// - Descriptive of the allocation algorithm +/// /// # Returns /// /// A static string slice representing the name of the strategy. +/// +/// # Example +/// +/// ``` +/// "average_by_circle" +/// ```rocketmq-client/src/consumer/rebalance_strategy/allocate_message_queue_averagely_by_circle.rs (4)
23-23: Add documentation for the allocation strategy.Please add documentation comments explaining the purpose and behavior of this allocation strategy. This helps users understand when to use this strategy over others.
+/// Implements a round-robin (circle) strategy for allocating message queues to consumers. +/// Each consumer is assigned message queues in a circular manner, starting from their position +/// in the consumer list. pub struct AllocateMessageQueueAveragelyByCircle;
25-47: Consider adding validation for empty message queue list.While the code handles various edge cases, it might be worth explicitly validating that
mq_allis not empty to prevent unnecessary processing.) -> crate::Result<Vec<MessageQueue>> { let mut result = Vec::new(); if !check(consumer_group, current_cid, mq_all, cid_all)? { return Ok(result); } + if mq_all.is_empty() { + return Ok(result); + }
55-169: Add missing test cases for edge scenarios.Consider adding tests for:
- Empty message queue list
- Consumer not found in consumer list (after implementing the error handling)
#[test] fn allocate_returns_empty_for_empty_message_queue_list() { let strategy = AllocateMessageQueueAveragelyByCircle; let consumer_group = CheetahString::from("test_group"); let current_cid = CheetahString::from("consumer1"); let mq_all = vec![]; let cid_all = vec![CheetahString::from("consumer1")]; let result = strategy .allocate(&consumer_group, ¤t_cid, &mq_all, &cid_all) .unwrap(); assert!(result.is_empty()); } #[test] fn allocate_returns_error_when_consumer_not_in_list() { let strategy = AllocateMessageQueueAveragelyByCircle; let consumer_group = CheetahString::from("test_group"); let current_cid = CheetahString::from("consumer_unknown"); let mq_all = vec![MessageQueue::from_parts("topic", "broker", 0)]; let cid_all = vec![CheetahString::from("consumer1")]; let result = strategy.allocate(&consumer_group, ¤t_cid, &mq_all, &cid_all); assert!(result.is_err()); }
1-169: Consider documenting the allocation strategy's characteristics.To help users choose the appropriate strategy, consider adding module-level documentation that explains:
- The algorithm's distribution characteristics
- Best-case and worst-case scenarios
- When to use this strategy over others
- Performance characteristics with different numbers of consumers and queues
This will help users make informed decisions when selecting a queue allocation strategy.
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📒 Files selected for processing (4)
rocketmq-client/src/consumer/allocate_message_queue_strategy.rs(2 hunks)rocketmq-client/src/consumer/rebalance_strategy.rs(3 hunks)rocketmq-client/src/consumer/rebalance_strategy/allocate_message_queue_averagely_by_circle.rs(1 hunks)rocketmq-common/src/common/message/message_queue.rs(3 hunks)
✅ Files skipped from review due to trivial changes (1)
- rocketmq-common/src/common/message/message_queue.rs
🔇 Additional comments (5)
rocketmq-client/src/consumer/rebalance_strategy.rs (3)
48-50: LGTM! Improved efficiency with direct CheetahString comparison
The optimization eliminates unnecessary string conversion while maintaining the same functionality. The added spacing also improves readability.
18-18: Verify the circle-based allocation implementation
The new module's visibility is private, which seems intentional for internal use. However, since this implements a core allocation strategy, consider if it should be public like its sibling module.
✅ Verification successful
Keep the module private as it follows the existing pattern
The implementation of AllocateMessageQueueAveragelyByCircle is properly implemented with the AllocateMessageQueueStrategy trait, following the same pattern as its sibling AllocateMessageQueueAveragely. The module's private visibility is consistent with the codebase's design, as both allocation strategies are meant to be accessed through the parent module's public interface.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify the implementation of the circle-based allocation strategy
# Check if the implementation file exists and contains the expected trait implementation
# Check for the implementation file
fd "allocate_message_queue_averagely_by_circle.rs" --type f
# Check for the trait implementation
ast-grep --pattern 'impl AllocateMessageQueueStrategy for $_ {
$$$
}'
Length of output: 9680
30-31: Verify API consistency and update documentation
The parameter type change from &str to &CheetahString might affect API consumers. Ensure this change is consistently applied across the codebase and documented in the API documentation.
rocketmq-client/src/consumer/allocate_message_queue_strategy.rs (1)
Line range hint 22-51: Verify trait implementation patterns across the codebase.
Let's ensure consistent implementation patterns across different allocation strategies.
✅ Verification successful
Let me analyze the implementation patterns more deeply by checking the actual implementations.
Trait implementation patterns are consistent and well-tested
The verification reveals a well-structured implementation of the AllocateMessageQueueStrategy trait:
- Two concrete implementations exist with different allocation strategies:
AllocateMessageQueueAveragely: Implements average distribution with remainder handlingAllocateMessageQueueAveragelyByCircle: Implements circular distribution of queues
- Both implementations properly handle edge cases and include necessary validation
- The trait is correctly used in the consumer infrastructure with proper type bounds
- Comprehensive test coverage exists for the circle implementation, validating various scenarios
- The trait is properly integrated into the consumer builder and rebalance implementation
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check for implementations and usage patterns of AllocateMessageQueueStrategy
# Find all implementations of the trait
echo "=== Trait Implementations ==="
ast-grep --pattern 'impl AllocateMessageQueueStrategy for $type {
$$$
}'
# Find where the trait is used as a type bound
echo "=== Usage as Type Bound ==="
rg "AllocateMessageQueueStrategy" -A 3
Length of output: 8940
Script:
#!/bin/bash
# Check implementation details of the two concrete implementations found
echo "=== AllocateMessageQueueAveragely Implementation ==="
cat rocketmq-client/src/consumer/rebalance_strategy/allocate_message_queue_averagely.rs
echo -e "\n=== AllocateMessageQueueAveragelyByCircle Implementation ==="
cat rocketmq-client/src/consumer/rebalance_strategy/allocate_message_queue_averagely_by_circle.rs
# Check if there are any tests for these implementations
echo -e "\n=== Tests ==="
rg "mod test" -A 10 rocketmq-client/src/consumer/rebalance_strategy/
Length of output: 10962
rocketmq-client/src/consumer/rebalance_strategy/allocate_message_queue_averagely_by_circle.rs (1)
1-22: LGTM! License and imports are properly structured.
The license header is correctly included, and imports are minimal and specific to the requirements.
| let index = cid_all | ||
| .iter() | ||
| .position(|cid| cid == current_cid) | ||
| .unwrap_or(0); |
There was a problem hiding this comment.
Improve error handling for consumer position.
The unwrap_or(0) could lead to unexpected behavior if the current consumer is not found in the list. Consider returning an error in this case as it indicates an invalid state.
- let index = cid_all
- .iter()
- .position(|cid| cid == current_cid)
- .unwrap_or(0);
+ let index = cid_all
+ .iter()
+ .position(|cid| cid == current_cid)
+ .ok_or_else(|| crate::Error::InvalidArgument(
+ format!("Current consumer {} not found in consumer list", current_cid)
+ ))?;📝 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.
| let index = cid_all | |
| .iter() | |
| .position(|cid| cid == current_cid) | |
| .unwrap_or(0); | |
| let index = cid_all | |
| .iter() | |
| .position(|cid| cid == current_cid) | |
| .ok_or_else(|| crate::Error::InvalidArgument( | |
| format!("Current consumer {} not found in consumer list", current_cid) | |
| ))?; |
| #[test] | ||
| fn allocate_returns_empty_when_check_fails() { | ||
| let strategy = AllocateMessageQueueAveragelyByCircle; | ||
| let consumer_group = CheetahString::from("test_group"); | ||
| let current_cid = CheetahString::from("consumer1"); | ||
| let mq_all = vec![MessageQueue::from_parts("topic", "broker", 0)]; | ||
| let cid_all = vec![CheetahString::from("consumer1")]; | ||
|
|
||
| let result = strategy | ||
| .allocate(&consumer_group, ¤t_cid, &mq_all, &cid_all) | ||
| .unwrap(); | ||
| assert!(!result.is_empty()); | ||
| } |
There was a problem hiding this comment.
Fix incorrect test name and assertion.
The test name suggests it checks for empty results when check fails, but the assertion verifies non-empty results. Either rename the test or fix the assertion to match the intended behavior.
- fn allocate_returns_empty_when_check_fails() {
+ fn allocate_returns_result_when_check_succeeds() {
let strategy = AllocateMessageQueueAveragelyByCircle;
let consumer_group = CheetahString::from("test_group");
let current_cid = CheetahString::from("consumer1");
let mq_all = vec![MessageQueue::from_parts("topic", "broker", 0)];
let cid_all = vec![CheetahString::from("consumer1")];
let result = strategy
.allocate(&consumer_group, ¤t_cid, &mq_all, &cid_all)
.unwrap();
assert!(!result.is_empty());
}📝 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.
| #[test] | |
| fn allocate_returns_empty_when_check_fails() { | |
| let strategy = AllocateMessageQueueAveragelyByCircle; | |
| let consumer_group = CheetahString::from("test_group"); | |
| let current_cid = CheetahString::from("consumer1"); | |
| let mq_all = vec![MessageQueue::from_parts("topic", "broker", 0)]; | |
| let cid_all = vec![CheetahString::from("consumer1")]; | |
| let result = strategy | |
| .allocate(&consumer_group, ¤t_cid, &mq_all, &cid_all) | |
| .unwrap(); | |
| assert!(!result.is_empty()); | |
| } | |
| #[test] | |
| fn allocate_returns_result_when_check_succeeds() { | |
| let strategy = AllocateMessageQueueAveragelyByCircle; | |
| let consumer_group = CheetahString::from("test_group"); | |
| let current_cid = CheetahString::from("consumer1"); | |
| let mq_all = vec![MessageQueue::from_parts("topic", "broker", 0)]; | |
| let cid_all = vec![CheetahString::from("consumer1")]; | |
| let result = strategy | |
| .allocate(&consumer_group, ¤t_cid, &mq_all, &cid_all) | |
| .unwrap(); | |
| assert!(!result.is_empty()); | |
| } |
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #1312 +/- ##
==========================================
+ Coverage 19.28% 19.50% +0.21%
==========================================
Files 433 434 +1
Lines 54114 54232 +118
==========================================
+ Hits 10438 10577 +139
+ Misses 43676 43655 -21 ☔ View full report in Codecov by Sentry. 🚨 Try these New Features:
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Which Issue(s) This PR Fixes(Closes)
Fixes #1293
Brief Description
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Summary by CodeRabbit
New Features
Bug Fixes
Performance Improvements
Tests