Hi Vikram,
First of all, what rmi module are you using: rmi or rmi2? rmi module does not support sun.* properties. Instead it supports a parallel structure of harmony.* ones.
About your question about DGC (i'll use rmi module as an example):
Remote object (on server side!) could be collected if all the conditions below are met:
1) (Of course) no hard references in local VM
2) no remote references from from other VMs
3) no in-progress remoted calls
Here is one of the simplest test scenarious showing how to check these conditions:
- run rmi-registry in separate VM
- export remote object, register it in the registry and remove hard references to this object
- kill rmi-registry VM
- wait for a period of time longer than the one specified by "java.rmi.dgc.leaseValue" property (the default is 10 min)
- if remote object implements Unreferenced then it's unreferenced() method should be called here
- run GC - the object should be collected and it's finalize() method should be called
I think your code is doing a lot of extra staff so i've modified it to implement this test scenarious (see attachment).
I did not use ProcessBuilder class as Harmony does not have it yet. The output of the test is also attached.
Hope this helps.
Regards, Mikhail
Intel MIddleware Products Division
> Been experimenting with the DGC interface of Java RMI and as far as I have understood there is no way to make a remote object be garbage collected other than invoke System.gc() and let it be collected over time.
>
> I however notice that the internal calls can be tracked by setting the following system properties,
>
> System.setProperty("java.rmi.server.logCalls", "true");
> System.setProperty ("sun.rmi.dgc.logLevel", "VERBOSE");
> System.setProperty("sun.rmi.dgc.logCalls", "true");
>
> What I was wondering is if you had any suggestions on how to actually ensure that the remote object has been collected. I tried placing System.out.println() statements in the finalize() and unreferenced() methods (the client also implements the Unreferenced interface) however it seems to generate no such output.
>
> Neither do the internal rmi logs that should be displayed in output in verbose mode show any indication of this happening.
>
> I have attached the code if you would be willing to examine it and let me know what I am not doing correctly. Ps. I have included them in zip format and as Java sources whichever is convinient for you.
>
> TestDistributedGarbageCollection.java is the RMI server and the EchoClient.java is the RMI client.
>
> Regards,
>
> - Vikram Mohan
Test: ready Test: VM2 destroyed EchoObject unreferenced Test: sleep finished EchoObject finalized
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