lock.lock() before try

[shenjianeng]

lock.lock() before try

[joeCarf]

在外面没什么问题。参考：https://juejin.cn/post/7269962653795270671

原写法是写到里面了，这个pr是改到外面的

[shenjianeng]

在外面没什么问题。参考：https://juejin.cn/post/7269962653795270671

这个回复好像容易误导人。

看下 jdk 的官方文档建议吧，应该来说是最“正宗的”，https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/ReentrantLock.html

It is recommended practice to always immediately follow a call to lock with a try block, most typically in a before/after construction such as:

 class X {
   private final ReentrantLock lock = new ReentrantLock();
   // ...

   public void m() {
     lock.lock();  // block until condition holds
     try {
       // ... method body
     } finally {
       lock.unlock()
     }
   }
 }

另外，上面掘金文章结尾有几句话：

1. 最好是把 lock.lock() 加锁方法写到 try 外面，是一种规范，而不是强制。

2. 如果你非要写到 try 里面，那么写到 try 语句块的第一行，或者 lock 加锁方法前面不会存在可能出现异常的代码。

3. 最后，如果你代码中加锁放到了 try 语句里，麻烦参考第 1 点

严格来讲这几个结论，可能在 ReentrantLock 这个实现下是没问题的，但 lock 是接口，会有任意实现多种实现。

在不同的实现下，lock.lock() 方法抛出异常是很有可能的，因此不能放在 try 当中。

[fuyou001]

更标准做法，是要放到try外面。

[shenjianeng]

resolved conflicts

[codecov-commenter]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (e104273) 43.25% compared to head (17259ae) 43.26%. Report is 2 commits behind head on develop.

Files	Patch %	Lines
...he/rocketmq/client/impl/consumer/ProcessQueue.java	61.11%	5 Missing and 2 partials :warning:
...tmq/namesrv/processor/DefaultRequestProcessor.java	77.77%	1 Missing and 1 partial :warning:
...a/org/apache/rocketmq/client/impl/MQAdminImpl.java	0.00%	1 Missing :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #7582      +/-   ##
=============================================
+ Coverage      43.25%   43.26%   +0.01%     
- Complexity      9880     9884       +4     
=============================================
  Files           1173     1173              
  Lines          85047    85049       +2     
  Branches       11014    11014              
=============================================
+ Hits           36788    36799      +11     
+ Misses         43692    43685       -7     
+ Partials        4567     4565       -2     

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