perf(DispatchService): improve performance

[ArgoZhang]

Link issues

fixes #5763

Summary By Copilot

This pull request includes changes to the DefaultDispatchService class in the src/BootstrapBlazor/Services/DefaultDispatchService.cs file. The main goal of these changes is to improve thread safety and compatibility with different .NET versions by modifying the locking mechanism.

Thread safety and compatibility improvements:

• Updated the locking mechanism to use _locker instead of locker for consistency. [1] [2]
• Introduced conditional compilation to use Lock for .NET 9.0 or greater and object for earlier versions, ensuring compatibility across different .NET versions.

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Improve thread safety and cross-version compatibility in the DefaultDispatchService by updating the locking mechanism

Bug Fixes:

• Standardize locking variable naming from 'locker' to '_locker' for consistency

Enhancements:

• Implement conditional compilation to support different .NET versions' locking mechanisms

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request enhances the DefaultDispatchService by improving thread safety through a consistent locking mechanism and ensuring compatibility across different .NET versions using conditional compilation. The locking mechanism was updated to use _locker instead of locker for consistency. Conditional compilation was introduced to use Lock for .NET 9.0 or greater and object for earlier versions.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Standardized the locking mechanism by consistently using _locker instead of locker.	Replaced locker with _locker in the Dispatch method. Replaced locker with _locker in the Subscribe method. Replaced locker with _locker in the UnSubscribe method.	src/BootstrapBlazor/Services/DefaultDispatchService.cs
Implemented conditional compilation to utilize Lock for .NET 9.0 and later versions, while maintaining compatibility with earlier versions by using object.	Added a preprocessor directive to define _locker as Lock when targeting .NET 9.0 or greater. Added a preprocessor directive to define _locker as object when targeting versions earlier than .NET 9.0.	src/BootstrapBlazor/Services/DefaultDispatchService.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5763	Improve the performance of the DispatchService.	✅
#5763	Improve thread safety of the DispatchService.	✅
#5763	Improve compatibility with different .NET versions.	✅

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it. You can also reply to a
  review comment with @sourcery-ai issue to create an issue from it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time. You can also comment
  @sourcery-ai title on the pull request to (re-)generate the title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time exactly where you
  want it. You can also comment @sourcery-ai summary on the pull request to
  (re-)generate the summary at any time.
• Generate reviewer's guide: Comment @sourcery-ai guide on the pull
  request to (re-)generate the reviewer's guide at any time.
• Resolve all Sourcery comments: Comment @sourcery-ai resolve on the
  pull request to resolve all Sourcery comments. Useful if you've already
  addressed all the comments and don't want to see them anymore.
• Dismiss all Sourcery reviews: Comment @sourcery-ai dismiss on the pull
  request to dismiss all existing Sourcery reviews. Especially useful if you
  want to start fresh with a new review - don't forget to comment
  @sourcery-ai review to trigger a new review!
• Generate a plan of action for an issue: Comment @sourcery-ai plan on
  an issue to generate a plan of action for it.

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider using AsyncLock instead of lock and object to avoid potential deadlocks.
• It might be clearer to use a preprocessor directive like #if NET9_0_OR_GREATER to conditionally define the locking mechanism.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}