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Re: Best way to do AOP-like stunts?

by Robert Fischer :: Rate this Message:

Spoke too soon -- you end up hitting the same catch I was hitting before, just in a different way
than I was.

Here's the catch: your code has lots of explicit definitions.

Your code:

def oldPlus = Integer.metaClass.getMetaMethod("plus", [Integer] as Class[])

Integer.metaClass.plus = { Integer n ->
return oldPlus.invoke( Math.abs(delegate), Math.abs(n) )
}

My code:

def oldMethods = Foo.metaClass.methods.find { ... }

oldMethods.each { MetaMethod oldMeth ->
Foo.metaClass.???? = { ?????

That's where it falls down -- how do I specify the new method declaration?

~~ Robert.

Robert Fischer wrote:

> Perfection itself.
>
> ~~ Robert.
>
> Ted Naleid wrote:
>> It's hard to know without more details, but this approach might work for
>> you:
>>
>> http://naleid.com/blog/2009/06/01/groovy-metaclass-overriding-a-method-whilst-using-the-old-implementation/
>>
>> It doesn't whack invokeMethod and simply uses the reference to the old
>> method (whatever that may be).
>>
>> -Ted
>>
>> On Mon, Jun 22, 2009 at 12:15 PM, Robert Fischer
>> <robert.fischer@...
>> <mailto:robert.fischer@...>> wrote:
>>
>> I'd like to wrap all calls into a particular library that contain a
>> particular type of argument, and
>> then do some adjustment to that argument before it continues
>> processing. I specifically do *not*
>> want to override/define invokeMethod, because I suspect someone else
>> might be hijacking that for
>> their own nefarious purposes, and I'm concerned I'll trounce their
>> work (or vice versa). What's the
>> best way to go about this? If I iterate over the MetaMethods, I'm
>> not entirely sure how to redefine
>> the calls so that my new implementation can call the old
>> implementation with the appropriately
>> mangled argument. Is there an idiom I should be using for this kind
>> of behavior?
>>
>> What I really want is something like Java 7's method handles...
>>
>> ~~ Robert Fischer, Smokejumper IT Consulting.
>> Enfranchised Mind Blog http://EnfranchisedMind.com/blog
>>
>> Check out my book, "Grails Persistence with GORM and GSQL"!
>> http://www.smokejumperit.com/redirect.html
>>
>>
>

--
~~ Robert Fischer, Smokejumper IT Consulting.
Enfranchised Mind Blog http://EnfranchisedMind.com/blog

Check out my book, "Grails Persistence with GORM and GSQL"!
http://www.smokejumperit.com/redirect.html

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