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<iAmDecim>
does anyone use Woo webserver? I see it's still BETA but for moderate traffic??
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<no-defun-allowed>
For some function call that has a compiler macro, will that compiler macro ever be invoked more than once?
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<no-defun-allowed>
Maybe an example would help: I have a protocol for a database, and say it has two methods MAP-FOO-NAMES and GET-FOO. Each place (map-foo-names function database) is called, I want to rewrite it to (map-foo-names/named function database '#:symbol-that-designates-this-place); and I have a simple compiler macro that facilitates that rewrite.
<no-defun-allowed>
Will MAP-FOO-NAMES/NAMED be called with the same symbol each time it is called from that invocation?
<Bike>
there's no guarantee that a compiler macro is called at most once.
<no-defun-allowed>
Bummer.
<Bike>
there's also no guarantee that they'll be called at all, so i'm not sure it's good for what you're doing anyway.
<no-defun-allowed>
True.
<Bike>
you could write it as a macro instead, and then it'll be called at least once but maybe more than once.
<no-defun-allowed>
Say I had a silly query like (map-foo-names (lambda (name) (print (get-foo name database))) database); an SQL database probably would not appreciate being asked to retrieve foo #1, foo #2, etc.
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<no-defun-allowed>
I could add another operator to map foos instead of foo-names, but this is a pretty small protocol compared to the one I am working with; so it might not be a good idea to give each query a generic function. Another legitimate query might not get any foos either.
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<no-defun-allowed>
It also would be unfortunate to make non-SQL databases implement half of SQL. My compromise is to tag each invocation of MAP-FOO-NAMES and count how many foos are retrieved and how many names were provided, allowing the database to decide if it should prefetch the foos or not.
<pjb>
or at least once.
<Bike>
i don't know the second thing about sql, sorry.
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<no-defun-allowed>
My understanding is they like big "batch" queries like SELECT NAME, FOO IN FOOS instead of SELECT NAME IN FOOS then repeatedly SELECT FOO IN FOOS WHERE NAME = 'a name'
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<White_Flame>
no-defun-allowed: look up "query planners"
<White_Flame>
that's the name for the sql search optimization stuff
<White_Flame>
which the DB does internally
<no-defun-allowed>
Are you suggesting the database can guess what it has to prefetch?
<White_Flame>
it looks at the whole query and tries to map out what the fastest way to traverse it will be
<White_Flame>
with like many decades of research into the field
<no-defun-allowed>
Right, but if my protocol generates multiple queries, will it still be of any use?
<White_Flame>
if you talk to a database, you want to put as much into a single query as possible, so it can cross-link and filter and make use of internal indexes in the DB
<White_Flame>
at least, if you want better performance
<no-defun-allowed>
That's what I hope to do with gathering statistics on what is retrieved per map-foo-names use.
<White_Flame>
I don't quite have the context of what you're doing; if you want that sort of smarts in your own data traversall, then looking at what query planners do is what you want
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<ebrasca>
Good morning!
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<beach>
Hello ebrasca.
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<splittist>
Good morning
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<beach>
Hello splittist.
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<elderK>
Hey all! Happy Saturday!
<elderK>
I am here, once again, to consult you for advice.
<elderK>
Particularly, naming of generic functions, the convention.
<elderK>
I've been using what I call the "Scheme" convention for accessors and the like.
<elderK>
type-thing. Say, activation-frame-size or location-offset
<elderK>
But for some types, this becomes unwieldy fast.
<elderK>
So, I was wondering how you guys get around this.
<elderK>
Do you use generics and just say the thing? Like, instead of location-offset, you just have a generic called index, and specialize it for a location?
<elderK>
Do you change convention depending on context? If so, when, and what questions do you ask, what constraints, help you decide when to apply which?
<beach>
elderK: I skip the type thing. Not only because it becomes unwieldy, but also because it becomes really weird with subclassing. Take CLIM, for instance. It looks very strange to say (SHEET-PARENT PANE).
<beach>
elderK: So I just skip the type prefix and use more packages instead.
<elderK>
beach: Thanks :)
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<elderK>
The next question comes to do with overloading, or the situation where say, you have a generic with a name that applies to many types, but in different ways.
<elderK>
I have seen the 'allow-other-keys' thing. I was wondering if and how that could be used to do this.
<elderK>
Say, one method expects two parameters, another expects one. But they are all the same generic.
<beach>
Such a situation is not recommended.
<beach>
If you have a name that appears to apply to different, unrelated, types, then those types should probably go in different packages.
<elderK>
So you'd disambiguate that case by using qualified names?
<beach>
Yes.
<elderK>
Which brings me to the next thing: Can each package define a generic with the same name?
<beach>
The correct term would be that I use "explicit package prefixes".
<beach>
Sure, the name of a generic function is either a symbol or (SETF symbol).
<no-defun-allowed>
I use your "Scheme convention" for classes that have subclasses that introduce few concepts that the superclasses don't.
<beach>
And symbols are specific to packages.
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<elderK>
Thank you :)
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<phoe>
minion: memo for elderK: there also exist package-local nicknames that aid one with defining functionalities in multiple packages. You can use names like A:OFFSET, F:OFFSET, S:OFFSET, even if the packages are named e.g. FROB.ACCESSIBILITY, FROB.FUNCTIONALITY, FROB.SECURITY - PLNs do the translation.
<minion>
Remembered. I'll tell elderK when he/she/it next speaks.
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<sgithens>
Hi all. I'm wondering if there is a way (or preferably nice way) to get a :predicate option for defclass similar to defstruct? I'm somewhat new, so I'm not sure if this would be lurking in an existing option, or needs to be a superclass, or metaclass that must be brought in.
<beach>
I think you either have to define it "manually", or you need some MOP manipulation to define a new metaclass, etc. It is probably not worth it.
<beach>
Just do (defgeneric stuff-p (x) (:method (x) nil) (:method ((x stuff)) t))
<beach>
... or you can use TYPEP to test for it.
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<sgithens>
beach: Thanks, I'm actually bringing an old project back up to speed that I've inherited, and it has and uses `XYZed?` predicate tests for all it's classes, but I can't quite tell where they are coming from, I think it may have pulled in quite older versions of CLOS and things. Mostly I'm looking at how to properly replicate this on modern CL
<beach>
sgithens: It is a bit strange to have so many uses for such a predicate.
<beach>
sgithens: It would be more common to use generic dispatch than to test for the type explicitly.
<pjb>
sgithens: a lighter way would be to define the predicate separately. (defclass foo …) (define-type-predicate foop foo)
<pjb>
sgithens: with a simplier (defmacro define-type-predicate (name type) `(defun ,name (x) (typep x ',type)))
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<sgithens>
pjb: Thanks much! I may start with the less intrusive define-type-predicate here, as there are probably less than 30 classes I need to do this for. I fear I'm still new enough to CL to be a little initimated at shadowing the defclass, but will take a look at it :)
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<beach>
sgithens: Like I said, a better way would be to use more generic functions rather than explicit tests for the type.
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<sgithens>
beach: I'm guessing because it would handle more of the nuances for comparing class heirarchies and oddities with equality and whatnot?
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<beach>
It is more a question of modularity. If you are using explicit tests in a function that has some action, then each class-specific action must be present in that function. So if you add some class you need to modify the function.
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<beach>
If you use a generic function ACTION, and specialize it to different classes, the class-specific actions are physically separated, and you can put them in different modules.
<beach>
So instead of (defun action (x) (cond ((a-p x) (do-a x)) ((b-p x) (do-b x))...)) you get (defmethod action ((x a)) (do-a x)) (defmethod action ((x b)) (do-b x)) ...
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<sgithens>
thanks beach, that was a helpful to have unpacked
<beach>
Oh, good.
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<Kabriel>
I'm playing around with py4cl. Anyone familiar with this package? I would like to unpack a dictionary in a function call, but can't quite figure out how to do that.
* Xach
is not familiar, sorry
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<jmercouris>
Kabriel: you are trying to do ** basically with some function that accepts kwargs?
<Kabriel>
yes
<jmercouris>
Kabriel: and does python-call work for you?
<Kabriel>
let me see; I was using chain
<jmercouris>
"python-call can be used to pass arguments to any python callable, such as a function in a module"
<jmercouris>
you see how you could unpack a dictionary into key-value pairs to make a call?
<Kabriel>
the issue is that the hash is "pythonized" as string and passed as a signle argument.
<Kabriel>
no
<jmercouris>
look at the call above
<jmercouris>
:b 2 :a 1
<jmercouris>
looks a lot like a plist does it not?
<jmercouris>
or is it alist?
<jmercouris>
I get them confused
<MichaelRaskin>
plist
<jmercouris>
anyways, you can convert your dictionary into that, and make the call
<Kabriel>
I am trying to use a python function that returns a dictionary and then pass that to a second pythong function
<jmercouris>
Yes, I get it
<jmercouris>
what I am telling you is that you may have to do some processing in Lisp
<Kabriel>
got it
<jmercouris>
deconstruct that dictionary into a plist and pass it where you would normally do kwargs things in Python
<jmercouris>
MichaelRaskin: thank you
<MichaelRaskin>
Well, you could probably write a "lambda …" string so that ** happens in Python
<jmercouris>
ah, yeah, that's another good idea
<Kabriel>
no, because then the dict gets passed as a string
<jmercouris>
OK, so then you will have to do the processing as I've suggested
<Kabriel>
in process
<jmercouris>
dictionary -> plist, and use python-call
<MichaelRaskin>
Does it get passed as string with python-call too?
<Kabriel>
there is a generic function pythonize that turns the hash table into a python dictionary
<jmercouris>
you know, you could just also write a lambda that contains both funcalls together in python
<jmercouris>
"lambda funcall2(funcall1)..."
<Kabriel>
I think this happens in both call and chain
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<MichaelRaskin>
Composing in Python is probably also faster (every time you cross some kind of imperfectly transparent border, there is some overhead)
<Kabriel>
temporary situtaion to use python plotting until some matplotlib equivalent is done
<Kabriel>
(in cl)
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<MichaelRaskin>
Well, I mean just that as long as you do multiple things in Python, consider doing all of them as a single chunk
<MichaelRaskin>
Then later the chunk might get smaller
<jmercouris>
I would say that is good advice
<jmercouris>
you could even wrap the chunk in a flet or defun
<jmercouris>
you don't necessarily want to interleave blobs of python everywhere in your CL
<jmercouris>
it might get hard to reason about, and difficult to extend in the future
<Kabriel>
Definitely not. I'm trying to interface with just a set of plotting stuff.
<jmercouris>
then just keep your API very simple
<jmercouris>
only pass the data once to python and let it do the rest in one solid chunk
<jmercouris>
no need to use this py4cl line by line passing back and forth then
<jmercouris>
it will be harder to understand that way anyway as compared to just plain python
<jmercouris>
that's just what I would do, :-)
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<vms14>
windows users, do you know if sbcl unix sockets work on windows 10?
<vms14>
I see windows 10 has unix sockets support
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<vms14>
meh, it's not the same api, so won't work
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<p_l>
SBCL uses Winsocks, afaik, so no, it has only access to the crippled side of Windows networking
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<vms14>
p_l: windows 10 stole the bsd sockets and "implemented" the unix sockets
<vms14>
but they're assholes and changed slightly the api
<p_l>
vms14: Berkeley got money to reimplement TOPS-20 TCP/IP implementation with contractual obligation to provide the source code to everyone
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<p_l>
nobody in the world stole BSD sockets
<vms14>
yeah, that's what the BSD license lets you do
<vms14>
but I tend to use "steal" where I mean "copy"
<p_l>
and Windows NT *native* network API isn't BSD sockets
<p_l>
Winsock just emulates them for applications based on BSD sockets API (which, btw, sucks - it's one of the worst around)
<vms14>
p_l then I'll have some kind of unix sockets with sbcl in windows?
<p_l>
vms14: my suggestion is to use OS-native APIs where possible. On Windows the norm is to use Named Pipes (not the same as unix FIFOs)
<vms14>
yes, I'll end using pipes instead for windows
<p_l>
wrap the system-specific transports in higher level API (it's not like it's hard to do, you have lisp on your side)
<p_l>
the implementation of Unix sockets is, afaik, mostly done for WSL1
<p_l>
WSL2 runs a stripped-down Linux kernel
<vms14>
I'm realizing since I'm using perl and sdl + unix sockets + sbcl and on the lisp side I won't use any external library, has to be quite portable
<vms14>
excepting the sockets part
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<vms14>
and since just discovered win 10 provides unix sockets, I was wondering if I'll really won't need any single change on the code
<p_l>
vms14: well, the necessary libs are part of the OS in WinNT case, and I'm pretty sure Perl has the libs for that as well
<vms14>
but it seems I'll have to use named pipes for win
<vms14>
perl supports that win sockets api, so on the perl side Idon't need to change nothing
<vms14>
but on the lisp side, it seems I will
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<vms14>
anyway it won't be much work to change unix sockets for named pipes, since that would be the only change I'll need
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