Load - caches and so forth?

[Dave Cragg]

On 28 Apr 2006, at 16:04, David Bovill wrote:

> Got a couple of questions about caching with the "load" command...
>
>    1) Is the stack / file cahed in memory or on disk -- looks like  
> it is in a local array in the libURL stack right?

In a libUrl array as you suspect.

>
>    2) If so the cache is lost when Rev quits - ie libURL closes?

That's right.

>
>    3) Does "load" work for all http related data access? "put" /  
> "get" but also "go" in the case of stack?

All of those, but it doesn't work for movie references. I'd guess it  
also doesn't work for image references either.


>
> Finally if I want a semi-permanent disk based "cache" - I guess I  
> should trap something using a front script? What would be the best  
> way to do this? Trap "getUrl"?, passing it if the url is not in the  
> disk based cache?

I'd be wary of trapping geturl. This is a handler inside libUrl that  
gets called directly by the engine, and it contains some irregular  
syntax.

Why not just have your own set of handlers for getting urls. Crude  
example:

function myGetUrl pUrl
   if isInCache(pUrl) then
    return getfromCache(pUrl)
else
   get url pUrl
   if the result is empty then
     putInCache pUrl, it
   else
     ## error message, etc.
  end if
end myGetUrl

Sorry, no space for the isInCache, getFromCache, putInCache  
handlers. :-)

Cheers
Dave