ClientPool holds the client instances in an ArrayList. The main purpose of
this is to make it easier to clean up all the instances at the end of a test.
If we didn't do this, threads might become zombie.
N.B. This class needs to be fully synchronized as it is called from sample threads
and the thread that runs testEnded() methods.
Add a ReceiveClient to the ClientPool. This is so that we can make sure
to close all clients and make sure all threads are destroyed.
client - the ReceiveClient to add
public static void clearClient()
Clear all the clients created by either Publish or Subscribe sampler. We
need to do this to make sure all the threads creatd during the test are
destroyed and cleaned up. In some cases, the client provided by the
manufacturer of the JMS server may have bugs and some threads may become
zombie. In those cases, it is not the responsibility of JMeter for those