//return engine activity
public static string GetEngineActivity(string engineName)
{
//try to open connexion to the engine
EngineClient client = EngineClientFromPool(engineName);
if (client == null)
{
return(null);
}
string activityXML = client.GetServerActivity();
//return client to pool
EngineClientToPool(client);
return(activityXML);
}