[ISSUE #1676] Optimize MessageListenerConcurrentlyFn signature

[yuz10]

Which Issue(s) This PR Fixes(Closes)

Fixes #1676

Brief Description

How Did You Test This Change?

Summary by CodeRabbit

• Refactor
  • Updated message listener function type signatures to use references to message extensions instead of owned values
  • Modified MessageListenerConcurrentlyFn and MessageListenerOrderlyFn to improve memory efficiency and reduce ownership complexity

[coderabbitai]

Walkthrough

The pull request modifies the type signatures of two function types in the RocketMQ Rust client: MessageListenerConcurrentlyFn and MessageListenerOrderlyFn. The changes involve altering the parameter types from owned or direct references to slices of references to MessageExt instances. This adjustment affects how messages are passed to message listener functions in both concurrent and orderly consumption modes, potentially improving memory efficiency and reducing unnecessary cloning.

Changes

File	Change Summary
rocketmq-client/src/consumer/listener/message_listener_concurrently.rs	Updated MessageListenerConcurrentlyFn type signature from Arc<dyn Fn(Vec<MessageExt>, ConsumeConcurrentlyContext)> to Arc<dyn Fn(&[&MessageExt], &ConsumeConcurrentlyContext)>
rocketmq-client/src/consumer/listener/message_listener_orderly.rs	Updated MessageListenerOrderlyFn type signature from Arc<dyn Fn(&[MessageExt], &ConsumeOrderlyContext)> to Arc<dyn Fn(&[&MessageExt], &ConsumeOrderlyContext)>

Assessment against linked issues

Objective	Addressed	Explanation
Optimize MessageListenerConcurrentlyFn signature [#1676]	✅

Possibly related issues

• [Enhancement⚡️] Optimize MessageListenerOrderlyFn signature #1677: Enhancement to optimize MessageListenerOrderlyFn signature, which seems closely related to the current changes

Possibly related PRs

• refactor: reference parameters for MessageListenerOrderlyFn #2417: Modification of MessageListenerOrderlyFn type signature similar to this PR

Suggested labels

enhancement⚡️, approved, auto merge, AI review first

Suggested reviewers

• TeslaRustor
• SpaceXCN
• rocketmq-rust-bot

Poem

🚀 Listeners dancing light and free,
References slice through memory's sea
Concurrent, orderly, messages flow
With CodeRabbit's optimizing glow! 🐰✨

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📜 Recent review details

Configuration used: .coderabbit.yaml
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 840d3a6 and e7961ff.

📒 Files selected for processing (2)

• rocketmq-client/src/consumer/listener/message_listener_concurrently.rs (1 hunks)
• rocketmq-client/src/consumer/listener/message_listener_orderly.rs (1 hunks)

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🔇 Additional comments (2)

rocketmq-client/src/consumer/listener/message_listener_orderly.rs (1)

36-36: Approve signature optimization with verification needed.

The change from &[MessageExt] to &[&MessageExt] is a good optimization that:

• Reduces potential memory overhead by avoiding message cloning
• Maintains thread safety with Send + Sync bounds
• Aligns with the trait definition

Let's verify the impact on existing implementations:

✅ Verification successful

Signature change verified - no breaking impact

The change from &[MessageExt] to &[&MessageExt] is safe as:

• No external implementations of MessageListenerOrderlyFn found in the codebase
• Internal usage in the consumer module is properly aligned with the new signature

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Search for existing MessageListenerOrderlyFn implementations that need updating
rg -l "MessageListenerOrderlyFn" | while read -r file; do
  echo "=== $file ==="
  rg -A 5 "MessageListenerOrderlyFn" "$file"
done

Length of output: 1259

rocketmq-client/src/consumer/listener/message_listener_concurrently.rs (1)

36-38: Approve significant optimization with migration guidance needed.

The change from Vec<MessageExt> to &[&MessageExt] is a substantial improvement that:

• Eliminates unnecessary vector allocations and ownership transfers
• Provides a more idiomatic Rust API using slices
• Maintains consistency with the orderly listener implementation

However, this is a breaking change that requires careful migration.

Consider adding migration documentation that:

1. Explains the performance benefits
2. Provides examples of updating existing implementations
3. Details any changes needed in message ownership handling

Let's verify the impact on existing implementations:

✅ Verification successful

Breaking change is well-contained and manageable

The signature change from Vec<MessageExt> to &[&MessageExt] is isolated to the listener interface. Internal processing continues to use Vec<MessageExt>, with conversion happening only at the consumer boundary. This design:

• Maintains performance benefits at the API level
• Keeps internal implementation details unchanged
• Requires minimal adaptation in consumer code

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Search for existing MessageListenerConcurrentlyFn implementations that need updating
rg -l "MessageListenerConcurrentlyFn" | while read -r file; do
  echo "=== $file ==="
  rg -A 5 "MessageListenerConcurrentlyFn" "$file"
done

# Look for potential Vec<MessageExt> to &[&MessageExt] conversion points
rg "Vec<MessageExt>" 

Length of output: 4410

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[rocketmq-rust-bot]

🔊@yuz10 🚀Thanks for your contribution🎉！

💡CodeRabbit(AI) will review your code first🔥！

Note

🚨The code review suggestions from CodeRabbit are to be used as a reference only, and the PR submitter can decide whether to make changes based on their own judgment. Ultimately, the project management personnel will conduct the final code review💥.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.65%. Comparing base (840d3a6) to head (e7961ff).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2423   +/-   ##
=======================================
  Coverage   28.65%   28.65%           
=======================================
  Files         510      510           
  Lines       73505    73505           
=======================================
  Hits        21060    21060           
  Misses      52445    52445           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[rocketmq-rust-bot]

LGTM

[mxsm]

LGTM