??????metaData match only once

Thu, 14 Apr 2022 08:31:00 -0700 

Sorry, in fact, 
`org.apache.shenyu.common.concurrent.MemoryLimitCalculator` is used, not 
`MemoryLimiter`.





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??????:                                                                         
                                               "????(dragon-zhang)"             
                                                                       
<[email protected]&gt;;
????????:&nbsp;2022??4??14??(??????) ????11:05
??????:&nbsp;"dev"<[email protected]&gt;;

????:&nbsp;metaData match only once



Hello community:

According to ISSUE[1], the more metadata, the slower the matching speed. 



The solution of this PR[2] is to add a LRU cache to make the same URL match 
only once.


This LRU cache uses `MemoryLimiter` to solve the memory problem: when the 
available memory of the JVM is less than a certain value, the cleanup action 
will be triggered.



If you are free, please see the PR[2] and help this PR[2] to solve the problem 
better.

Looking forward to your reply.

[1] https://github.com/apache/incubator-shenyu/issues/3177
[2] https://github.com/apache/incubator-shenyu/pull/3245

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