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From FaeLLe <mrbillcollec...@gmail.com>
Subject java.rmi package contribution test suites
Date Mon, 21 Aug 2006 22:34:50 GMT

I have pulled the java.rmi.* contribution code from the Harmony SVN and was
examining the test cases for the RMI DGC.Have a few questions about how the
test is performed if anyone can clarify them for me.

As far as I have understood the following is how the operation is,

   - TestDistributedGarbageCollector.java acts as the RMI server.
   - It creates a RMI registry on port 1099.
   - Sets the Garbage collection parameters.
   - Creates a new echoServer.
   - Binds echoServer as Echo2.
   - Uses ProcessBuilder to launch EchoClient2 process.
   - Unbind's Echo2 after Thread sleep.
   - The RMI client Echo2 looks for Echo2 in RMI Registry.
   - Enters EchoTest2 after echo(String) is called on stub.
   - Returns the display to be shown.
   - Invoke's System.gc().

When the client is Garbage collected it creates a new file name "done".

However some things confuse me and it would nice if you could clarify them
for me.

   - I notice the TestDistributedGarbageCollector class has two Threads
   that perform sleep, what is the second sleep Thread for ?
   - I notice it invokes runGc() method but what does it test ? I have
   seen WeakReference being created and a GC call being performed but what does
   it test ?
   - Why after the second sleep Thread is a file f created ?
   - How does the assertTrue function of JUnit work with file f ?
   - How does it determine if GC has taken place ? How will it use f to
   determine that
   - If it determines that garbage collection has failed if f still
   exists why is f created before the assert statement ?

Thanks for helping me out and I know it is quite a lot of questions but your
help will benifit me greatly.

Yours Sincierly,

- Vikram Mohan


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