I am looking for a Tie module that will roughly do the following:

• Is readonly
• If a key is in keys(%dispatch_table), where %dispatch_table would be passed in as a parameter, it would execute the value for that key in the dispatch table and return the return vaue.
• Otherwise, woud get the value from another "fallback" hash which might be a Tie::DBI type structure. This "fallback" hash woud also be passed in.

Of course it would be nice if the dispatch subroutines could actually refer to the hash itself to get other values... but that may be more than I can hope for.

I've looked at Tie::ShadowHash and it looks promising, but I'd need building blocks in a module that ties to a dispatch table.

Are there any tricks to do this elegantly with existing modules rather than writing my own tie module. I'm looking for building bocks and combinator methods that combine two tied hashes to make a new tied hash.

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