fix: Double-checked locking for logConstructor

[qingbozhang]

When the tryImplementation method is called concurrently, the value of logConstructor may be overwritten. So I'm going to use DCL to solve this problem.

[harawata]

Thank you for the PR, @qingbozhang .

We have just eliminated synchronized blocks ( #3017 ).
Besides, enclosing Runnable#run() in synchronized may not achieve anything.

Are you actually experiencing some problem?
If so, please provide information for how to reproduce the problem.

[qingbozhang]

Not yet. It just happen in theory.
I see ( #3017 ).
I can use lock field replace synchronized if necessary, and I can close this PR if not