Thread IDs are reused often, so there could be a case where a thread died without releasing the slot, and comes up and allocates a new slot before garbage collector could free it.
通常线程ID会得到重用，因此可能会出现这样的情况，即一个线程已经死亡，却没有释放相应的槽位，并在垃圾收集器释放该槽位之前，再次使用了这个线程ID并为其分配一个新的槽位。
If the server receives more than the maximum number, it simply queues the additional RPCs until a free call executor thread is available to execute the RPC.
如果服务器收到的RPC超过这个最大数量，它会把多余的RPC排队，直到有空闲的调用执行者线程可以执行rpc。
If the pool maintenance thread decides that a connection in the free pool needs to be discarded, it physically closes the connection to the JMS provider.
如果池维护线程确定需要丢弃空闲池中的连接，则它物理关闭到JMS提供程序的连接。
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