[ISSUE #1056]Optimize CountDownLatch⚡️

[mxsm]

Which Issue(s) This PR Fixes(Closes)

Fixes #1056

Brief Description

How Did You Test This Change?

Summary by CodeRabbit

• New Features

  • Introduced a wait_timeout method to allow tasks to wait for a count to reach zero or for a specified timeout.

• Improvements

  • Enhanced concurrency model by enabling shared ownership of CountDownLatch instances.
  • Simplified instantiation process for CountDownLatch.

• Bug Fixes

  • Improved flexibility in using count_down and wait methods without ownership transfer.

• Tests

  • Expanded test suite to include scenarios for the new wait_timeout method.

[coderabbitai]

Walkthrough

The changes in the rocketmq/src/count_down_latch.rs file involve modifications to the CountDownLatch structure, enhancing its concurrency capabilities. The count and notify fields are now wrapped in Arc, allowing shared ownership. The new method returns a CountDownLatch instance directly, and methods count_down and wait have been updated to take a reference to self. A new wait_timeout method has been introduced to manage timeouts. Additionally, new tests have been added to validate the functionality of the wait_timeout method.

Changes

File	Change Summary
rocketmq/src/count_down_latch.rs	Updated CountDownLatch structure to use Arc<Mutex<u32>> for count and Arc<Notify> for notify. Modified method signatures for new, count_down, and wait. Added wait_timeout method and expanded test suite for it.

Assessment against linked issues

Objective	Addressed	Explanation
Optimize CountDownLatch (#1056)	✅

🐰 In the meadow where bunnies play,
A latch counts down, come what may.
With shared ownership, tasks align,
Waiting for zero, all in good time!
New tests hop in, ensuring it's right,
CountDownLatch shines, a marvelous sight! 🌟

---

Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media?

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

🪧 Tips

Chat

There are 3 ways to chat with CodeRabbit:

• Review comments: Directly reply to a review comment made by CodeRabbit. Example:
  • I pushed a fix in commit <commit_id>, please review it.
  • Generate unit testing code for this file.
  • Open a follow-up GitHub issue for this discussion.
• Files and specific lines of code (under the "Files changed" tab): Tag @coderabbitai in a new review comment at the desired location with your query. Examples:
  • @coderabbitai generate unit testing code for this file.
  • @coderabbitai modularize this function.
• PR comments: Tag @coderabbitai in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
  • @coderabbitai gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.
  • @coderabbitai read src/utils.ts and generate unit testing code.
  • @coderabbitai read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.
  • @coderabbitai help me debug CodeRabbit configuration file.

Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments.

CodeRabbit Commands (Invoked using PR comments)

• @coderabbitai pause to pause the reviews on a PR.
• @coderabbitai resume to resume the paused reviews.
• @coderabbitai review to trigger an incremental review. This is useful when automatic reviews are disabled for the repository.
• @coderabbitai full review to do a full review from scratch and review all the files again.
• @coderabbitai summary to regenerate the summary of the PR.
• @coderabbitai resolve resolve all the CodeRabbit review comments.
• @coderabbitai configuration to show the current CodeRabbit configuration for the repository.
• @coderabbitai help to get help.

Other keywords and placeholders

• Add @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.
• Add @coderabbitai summary to generate the high-level summary at a specific location in the PR description.
• Add @coderabbitai anywhere in the PR title to generate the title automatically.

Documentation and Community

• Visit our Documentation for detailed information on how to use CodeRabbit.
• Join our Discord Community to get help, request features, and share feedback.
• Follow us on X/Twitter for updates and announcements.

[mxsm]

🚀Thanks for your contribution🎉. CodeRabbit(AI) will review your code first🔥

[coderabbitai]

Actionable comments posted: 0

🧹 Outside diff range and nitpick comments (1)

rocketmq/src/count_down_latch.rs (1)

Line range hint 54-60: Prevent count from becoming negative in count_down

In the count_down method, decrementing count without checking if it's already zero may cause it to become negative if count_down is called more times than the initial count. This could lead to unexpected behavior.

Consider adding a check to ensure that count does not go below zero.

Apply this diff to prevent count from becoming negative:

 pub async fn count_down(&self) {
     let mut count = self.count.lock().await;
+    if *count == 0 {
+        // Optionally, log a warning or handle the extra call appropriately
+        return;
+    }
     *count -= 1;
     if *count == 0 {
         self.notify.notify_waiters();
     }
 }

📜 Review details

Configuration used: .coderabbit.yaml
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between fd2f251 and 45d22e0.

📒 Files selected for processing (1)

• rocketmq/src/count_down_latch.rs (4 hunks)

🧰 Additional context used

🔇 Additional comments (2)

rocketmq/src/count_down_latch.rs (2)

85-87: wait_timeout method correctly handles timeout scenarios

The wait_timeout method correctly uses tokio::time::timeout to wait for the latch to reach zero or for the timeout to elapse. Returning a boolean to indicate the outcome is clear and effective.

---

101-114: Comprehensive tests for wait_timeout functionality

The added tests for wait_timeout effectively cover scenarios where the count reaches zero before the timeout and where the timeout occurs first. This improves confidence in the correctness of the new method.

[codecov]

Codecov Report

Attention: Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.

Project coverage is 19.91%. Comparing base (fd2f251) to head (45d22e0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
rocketmq/src/count_down_latch.rs	96.15%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1057      +/-   ##
==========================================
+ Coverage   19.86%   19.91%   +0.05%     
==========================================
  Files         425      425              
  Lines       35354    35374      +20     
==========================================
+ Hits         7022     7044      +22     
+ Misses      28332    28330       -2     

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