Re: RMI callback on exist socket connection.

Thanks , That's really a charming idea.

Lamb


Eamonn McManus wrote:

> Lamb,
>
> One possibility is for the client to repeatedly call a remote method
> on the server.  This method blocks until the server has something it
> wants the client to do.  Then it returns to the client an indication
> of what that is, the client does it, and then calls the method again.
> Depending on what you want to do this could suffice.
>
> We use this technique in the JMX Remote API to deliver asynchronous
> notifications from server to client.  The client calls a remote method
> fetchNotifications in the server.  That method blocks until
> notifications arrive, whereupon it returns them to the client.  The
> client dispatches them, then calls fetchNotifications again.
>
> If you use this technique, it is probably a good idea to have the
> blocking method return occasionally even if there is nothing for the
> client to do.  Otherwise, if the client dies, the server won't notice
> until the method does need to return.  In the meantime, the ongoing
> method call will prevent the remote object from being garbage-collected.
>
> Regards,
> Éamonn McManus   JMX Spec Lead   http://weblogs.java.net/blog/emcmanus/
>
>
> lamb liu wrote:
>
>> Generally, if I want to initiate callback from RMI server to a
>> client(for notification, etc...)
>> I need to export the client object ,
>> Thus JDK will try to setup another socket on the server to connect back.
>> This method will incur many problem especially when client is behind
>> a proxy.
>>
>> I wonder if it is another method to implement callback on established
>> connection.
>> In theory, it is possible, since this connection is full duplex
>> connection, thus server
>> can send data back.
>> But I never found clear implementation on this issue.
>> Sun's RMI faq points out: it is not normally possible. So how can I
>> do it abnormally?
>> Does a solution exist?Or I must do it by myself?
>>
>> Lamb.
>>
>>

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