Re: Size of Service Objects in Jini

Gregg Wonderly wrote:
> Stefan Hoferer wrote:
>> Hello everybody,
>>
>> I am currently writing my diploma thesis need to include a (very) 
>> short comparison between Jini, UPnP  and other service discovery 
>> mechanisms.
>>
>> Unfortunately I don't have the time to read the full Jini architecture.
>>
>> Main focus is on the amount of information that has to be exchanged 
>> between client and lookup service prior a service can be used by the 
>> client. For UPnP this mainly corresponds to the XML service 
>> description documents.
>> As far as I understand Jini exchanges  Service Objects. Is there any 
>> limitation of size? Or can someone provide me with some example values 
>> from his/her own services? Is there other information exchanged or is 
>> everything included in this service objects?
> 
> The service discovery mechanisms are based around what is defined in the 
> ServiceRegistrar interface.  The value registered with the 
> ServiceRegistrar implementation is simply a Java Serializable object.  
> It can be of any size and complexity needed.  It might be a simple 
> remote proxy stub that points at a remote service implementation.  It 
> might be a Serializable object that is the service in its entirety.  It 
> might also be a combination of these two where it is a Serializable 
> object that holds a reference to one or more proxy stubs with some 
> client side code execution that makes remote calls when appropriate.  
> This kind of proxy (a Serialized object that isn't a remote stub) is 
> often called a smart proxy because of the logic it uses locally, at the 
> client, to decide when to use the network.

These stubs and/or serializable objects will also include a URL to the 
java byte codes that define them (object == code + data), if the 
receiving  client has not already fetched this code that will also need 
to be downloaded.

-- 
John McClain					[email protected]
Sun Microsystems, Inc.
Burlington, MA

And it is that way today. We are tricked by hope into starting
companies, beginning books, immigrating to this country and investing
in telecom networks. The challenges turn out to be tougher than we
imagined. Our excessive optimism is exposed. New skills are demanded.
But nothing important was ever begun in a prudential frame of mind.

         - David Brooks

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