Re: Cancellation forwarding protocol (was Re: Reliability of RPC services)

[Bas Wijnen]

On Thu, Apr 27, 2006 at 04:06:35PM -0400, Jonathan S. Shapiro wrote:
> Because of this, the operation that you want here is Discrim.
> 
> HOWEVER!!!
> 
> This case is so universal that there will be a safeGetType() method on
> the discrim interface. Discrim.safeGetType() will perform:
> 
>    {
>       if (discrim.classify(theCap) == ctInvalid
>            return ctInvalid;
>         else
>            return theCap.getType();
>    }
> 
> This is actually implemented at the library level, and I had forgotten
> about it.

So if the capability is invalid, it isn't invoked, but ctInvalid is returned
instead.  However, if it is valid, the capability is invoked in order to get
the type, and a reply capability is thereby invalidated.

How does this differ from simply calling theCap.getType()?

Thanks,
Bas

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