Optimization code

[hdyztmdqd]

What is the purpose of the change

Optimization code

1.Use StringBuilder#append(Char) to improve performance
2.Replace runnable with lambda
3.The original implementation calls the get method twice.Replace it with computeIfAbsent.

Brief changelog

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.40351% with 22 lines in your changes missing coverage. Please review.

Project coverage is 65.64%. Comparing base (89863e0) to head (c7ae4e5).
Report is 133 commits behind head on 3.0.

Files with missing lines	Patch %	Lines
...va/org/apache/dubbo/common/utils/ExecutorUtil.java	44.44%	4 Missing and 1 partial ⚠️
...etadata/report/support/AbstractMetadataReport.java	55.55%	3 Missing and 1 partial ⚠️
...he/dubbo/qos/server/handler/QosProcessHandler.java	0.00%	4 Missing ⚠️
...he/dubbo/registry/multicast/MulticastRegistry.java	25.00%	3 Missing ⚠️
...apache/dubbo/common/extension/ExtensionLoader.java	85.71%	2 Missing ⚠️
.../rpc/cluster/router/state/RouterGroupingState.java	0.00%	1 Missing ⚠️
...ache/dubbo/qos/command/impl/GetRouterSnapshot.java	0.00%	1 Missing ⚠️
.../dubbo/remoting/http/jetty/JettyLoggerAdapter.java	0.00%	1 Missing ⚠️
.../org/apache/dubbo/test/check/DubboTestChecker.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.0   #10158      +/-   ##
============================================
- Coverage     65.68%   65.64%   -0.04%     
+ Complexity      320      319       -1     
============================================
  Files          1224     1224              
  Lines         53413    53415       +2     
  Branches       8077     8074       -3     
============================================
- Hits          35086    35066      -20     
- Misses        14508    14532      +24     
+ Partials       3819     3817       -2     

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