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[tamas]

Hi all,

I need to obtain the 'Client UUID' on the node side.

Client UUID is defined in constructor of the client JPPFClient(String uuid).

I will use this info to create a unique directory for each client on the node side.

I am sure that is possible to get this info but I cannot see it in the documentation.

JPPF task is defined as
public class JPPF_FTPDownloadTask extends AbstractTask<String> {
}

Thanks,
Tomas

[lolo]

Hi Tomas,

To get the UUID from a task on the node side, you need to add it as (part of) a custom task attribute, or (recommended) put it in the job's data provider:

client side:

Code: [Select]

JPPFClient client = ...;
DataProvider dataProvider = new MemoryMapDataProvider();
job.setDataProvider(dataProvider);
dataProvider.setParameter("client.uuid", client.getUuid());
node side:

Code: [Select]

public class MyTask extends AbstractTask<String> {
  @Override
  public void run() {
    String clientUuid = getDataProvider().getParameter("client.uuid");
    ...
  }
}
Sincerely,
-Laurent

[tamas]

Hello Laurent,

I know that it could be done as you wrote through the DataProvider.

The problem is that we need to know the client id everywhere inside the code without pass this info through all the program.

We know the client id from the DataProvider in "MyTask extends AbstractTask<String>" but I do not have this info in my instance which is called by other 20 instancies.

We use our own ClassLoader which reads class files from directory identified by client_id = each client has own classes which are loaded dynamically.

I know that is possible to get the client class loader by
ClassLoader loader = Thread.currentThread().getContextClassLoader();

So you allways know which client's code is processed.
As I know from doc each client has own ClassLoader
http://www.jppf.org/doc/v3/index.php?title=Class_loading_in_JPPF

From this I think that should be possible to get the client_id from any part of code. What do you think about it?

Thanks,
Tomas

[lolo]

Hi Tomas,

I don't know what you mean by "I do not have this info in my instance which is called by other 20 instances", so I do not understand what you're trying to achieve. In particular, what do you mean exactly by "instance" ?

Anyway, if you manage to get a hold of the JPPF class loader that loaded the tasks, you can use AbstractJPPFClassLoaderLifeCycle.getClientUuid() to get the client uuid. Just make sure the class loader is really an instance of AbstractJPPFClassLoaderLifeCycle before using it:

Code: [Select]

String clientUuid = null;
ClassLoader loader = Thread.currentThread().getContextClassLoader();
if (loader instanceof AbstractJPPFClassLoaderLifeCycle) {
  clientUuid = ((AbstractJPPFClassLoaderLifeCycle) loader).getClientUuid();
}
Sincerely,
-Laurent

[tamas]

Thanks Laurent,

it is exactly what I need.

By 'instance' I meant object = instance of object.

Thanks for your help.
It is a good way how to know the client id in any part of the code.

Best regards,
Tomas