[ISSUE #1430] Add TopicMessageQueueChangeListener trait for client #1431
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WalkthroughThe changes in this pull request introduce a new public module, Changes
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🧹 Outside diff range and nitpick comments (1)
rocketmq-client/src/consumer/topic_message_queue_change_listener.rs (1)
23-30: Consider enhancing the documentation with additional details.While the current documentation is good, it could be more comprehensive. Consider adding:
- Thread safety guarantees and expectations
- Whether the callback is expected to be synchronous or asynchronous
- Whether implementations should be idempotent
- Potential scenarios when this callback might be invoked
Here's a suggested documentation enhancement:
/// A trait for listening to changes in the message queues of a specific topic. +/// +/// This trait is thread-safe (`Send + Sync`) and implementations should be prepared +/// to handle concurrent invocations. The callback is expected to be non-blocking +/// and should handle message queue changes idempotently. +/// +/// # Thread Safety +/// +/// The trait requires `Send + Sync` bounds to ensure thread-safe usage across +/// multiple consumer threads. Implementations should be careful about shared state +/// access and potential deadlocks. +/// +/// # Callback Behavior +/// +/// The `on_changed` method may be called in the following scenarios: +/// - Initial topic subscription +/// - Broker cluster topology changes +/// - Topic queue scaling operations /// /// # Arguments /// /// * `topic` - The name of the topic whose message queues have changed. /// * `message_queues` - A set of `MessageQueue` instances representing the new state of the -/// message queues. +/// message queues. This set represents the complete state, not just the changes.
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📒 Files selected for processing (2)
rocketmq-client/src/consumer.rs(1 hunks)rocketmq-client/src/consumer/topic_message_queue_change_listener.rs(1 hunks)
🔇 Additional comments (4)
rocketmq-client/src/consumer.rs (1)
33-33: LGTM! Module declaration follows established patterns.
The new public module declaration follows the existing pattern and naming conventions, appropriately grouped with other listener-related modules.
Let's verify how this new listener integrates with existing listener modules:
✅ Verification successful
LGTM! The new listener trait follows established patterns and integrates well with existing listener architecture.
The verification shows that:
- The new
TopicMessageQueueChangeListenertrait follows the same thread-safety bounds (Send + Sync) as other listeners - It has a similar method signature pattern to the existing
MessageQueueListenertrait - The implementation is properly placed alongside other message queue related listeners in the consumer module
- The trait's API is well-documented with clear purpose and parameters
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check for potential integration points and similar listener patterns
# Check for other listener implementations and patterns
echo "Checking for other listener implementations:"
rg -A 5 "trait.*Listener"
# Check for usage patterns of existing listeners
echo "Checking for listener usage patterns:"
ast-grep --pattern 'impl $_ for $_ {
$$$
}'
Length of output: 102801
Script:
#!/bin/bash
# Let's check for the new listener trait and its integration points
# Check the implementation of the new listener trait
echo "Checking the TopicMessageQueueChangeListener trait implementation:"
rg -A 10 "TopicMessageQueueChangeListener" rocketmq-client/src/consumer/topic_message_queue_change_listener.rs
# Check for potential usage/integration points
echo "Checking for usage of the new listener:"
rg -A 5 "TopicMessageQueueChangeListener" --type rust
# Check for similar message queue related listener patterns
echo "Checking for similar message queue listener patterns:"
rg -A 5 "MessageQueue.*Listener" --type rust
Length of output: 7229
rocketmq-client/src/consumer/topic_message_queue_change_listener.rs (3)
17-19: LGTM! Clean and minimal imports.
The imports are appropriate and well-organized, using only what's necessary for the implementation.
21-22: LGTM! Well-designed trait with appropriate thread safety bounds.
The trait is properly designed with Send + Sync bounds, making it safe to use in a concurrent context, which is crucial for a message queue system.
30-30: Verify consistency with RocketMQ Java client implementation.
The method signature takes ownership of the HashSet<MessageQueue>. Let's verify if this matches the behavior in the Java client and if it's the most efficient approach.
✅ Verification successful
Let me gather more information about the implementation details.
Based on the comprehensive code analysis, I can now provide the final response:
The current implementation using owned HashSet<MessageQueue> is correct and consistent with the codebase design
The implementation is well-aligned with the codebase patterns for several reasons:
- The
MessageQueueListenertrait uses borrowed&HashSet<MessageQueue>for its callback, whileTopicMessageQueueChangeListenertakes ownership, showing an intentional design difference - The owned
HashSet<MessageQueue>pattern is consistently used throughout the codebase when representing a new state or result set (e.g., inLockBatchResponseBody,get_working_message_queue) - Taking ownership is appropriate here as this represents a new state of message queues that the listener might need to store or process further
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check how the Java client implements this listener to ensure consistency
# Search for the Java implementation of TopicMessageQueueChangeListener
rg -t java "TopicMessageQueueChangeListener|onChanged.*MessageQueue"
# Search for similar patterns in other Rust message queue clients for best practices
rg -t rust "MessageQueue.*Listener|queue.*change.*callback"
Length of output: 1468
Script:
#!/bin/bash
# Check the implementation of both listener traits and their usage
ast-grep --pattern 'trait MessageQueueListener {
$$$
}'
ast-grep --pattern 'trait TopicMessageQueueChangeListener {
$$$
}'
# Check how these listeners are used in the codebase
rg -A 5 "impl.*MessageQueueListener"
rg -A 5 "impl.*TopicMessageQueueChangeListener"
Length of output: 219
Script:
#!/bin/bash
# Let's check the actual content of these files
cat rocketmq-client/src/consumer/topic_message_queue_change_listener.rs
cat rocketmq-client/src/consumer/message_queue_listener.rs
# Also check where HashSet<MessageQueue> is used in similar contexts
rg -B 2 -A 2 "HashSet<MessageQueue>"
Length of output: 20488
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Which Issue(s) This PR Fixes(Closes)
Fixes #1430
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New Features
Documentation