synchronized local variables or parameters should be set to final

[slievrly]

Signed-off-by: slievrly slievrly@163.com

What is the purpose of the change

synchronized local variables or parameters should be set to final

Brief changelog

optimize synchronized obj

Verifying this change

ci

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[codecov-io]

Codecov Report

Merging #4325 into master will decrease coverage by 0.06%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #4325      +/-   ##
============================================
- Coverage     62.93%   62.86%   -0.07%     
+ Complexity      506      504       -2     
============================================
  Files           769      769              
  Lines         32995    32995              
  Branches       5215     5215              
============================================
- Hits          20765    20742      -23     
- Misses         9831     9848      +17     
- Partials       2399     2405       +6

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/dubbo/common/bytecode/Proxy.java	72.22% <ø> (ø)	0 <0> (ø)	⬇️
...he/dubbo/registry/multicast/MulticastRegistry.java	67.87% <100%> (ø)	0 <0> (ø)	⬇️
...org/apache/dubbo/rpc/filter/ActiveLimitFilter.java	95.45% <100%> (ø)	0 <0> (ø)	⬇️
...apache/dubbo/common/extension/ExtensionLoader.java	79.11% <100%> (ø)	0 <0> (ø)	⬇️
...ache/dubbo/remoting/p2p/support/AbstractGroup.java	45.45% <0%> (-11.37%)	0% <0%> (ø)
.../remoting/transport/netty4/NettyServerHandler.java	61.9% <0%> (-9.53%)	0% <0%> (ø)
...ng/transport/dispatcher/all/AllChannelHandler.java	51.42% <0%> (-5.72%)	0% <0%> (ø)
.../org/apache/dubbo/remoting/ExecutionException.java	15.78% <0%> (-5.27%)	0% <0%> (ø)
...onfig/spring/extension/SpringExtensionFactory.java	80.48% <0%> (-4.88%)	0% <0%> (ø)
.../dubbo/remoting/transport/netty4/NettyChannel.java	61.17% <0%> (-4.71%)	0% <0%> (ø)
... and 7 more

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[ralf0131]

LGTM.