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Faré | 21 Feb 2013 06:13
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failures with asdf3

Dear Lisp hacker(s),

ASDF3 now checks deferred warnings by default.
On SBCL, this means that it will treat as an error
any undeclared free variable, including forward references to special variables
as well as any undefined function that isn't defined by the end of the system.

Using cl-test-grid to compile all the systems in quicklisp,
we found the following failure on a system we believe you maintain.
Can you please fix it?

—♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org
Not only is there no contradiction between egoism and altruism, but no
altruism is possible without egoism - for what betterment to wish to an other
person devoid of selfish desire, to whom any change is indifferent?

elephant-tests
http://cl-test-grid.appspot.com/blob?key=aolorltuuv

dcm
http://cl-test-grid.appspot.com/blob?key=cs137uooya

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Gustavo Milaré | 9 Feb 2013 00:40
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Slot ELEPHANT::SCHEMA-NAME-INDEX unbound error

Hello,

I've been using ELEPHANT (from Quicklisp) for one particular project and 
noticed a lot of errors.

About the CLP backend, I'm getting this error:

The slot ELEPHANT::SCHEMA-NAME-INDEX is unbound in the object 
#<CLP-CONTROLLER /home/gugamilare/test/≥.

All I am doing is:

CL-USER> (open-store '(:clp "/home/gugamilare/test/"))
#<CLP-CONTROLLER /home/gugamilare/test/≥
CL-USER> (defpclass foo ()
            ((foos :accessor foos-of :initform nil)))
#<PERSISTENT-METACLASS FOO>
CL-USER> (add-to-root :foo1 (make-instance 'foo))
#<FOO oid:6>
CL-USER> (close-store)
NIL

;;; Restart Lisp...

CL-USER> (defpclass foo ()
            ((foos :accessor foos-of :initform nil)))
#<PERSISTENT-METACLASS FOO>
CL-USER> (open-store '(:clp "/home/gugamilare/test/"))
; Evaluation aborted on #<UNBOUND-SLOT SCHEMA-NAME-INDEX {1004F3EAE3}>.
(Continue reading)

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Hugo Duncan | 13 Oct 2011 09:17
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Re: (no subject)

..Sex all night long!   http://e-aulas.com.ar/com.friend.php?zyrs=18a3
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Arnaud Betremieux | 28 Sep 2011 18:52
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Migration and derived slots

With the latest Git revision on SBCL 1.0.51, when trying to migrate
objects that have a derived slot, elephant tries to call setf
slot-value-using-class on the derived slot, resulting in an error :
"Cannot write computed (derived) slot... for read/index retrieval
only".

It seems to me that copy-persistent-slots shouldn't try to write
derived slots, as the work will be done when (setf
slot-value-using-class) is called on the slots the derived function
depends on.

So I tried to patch the code for that (see attached patch). This seems
to do the trick in that the migration works.

I stumble upon another problem though : the derived slots are unbound
after migration. Apparently, update-derived-slots is called when
copying slot values, but derived-slots-trigger seems to always return
nil... I don't get why.

Here's my test case if anyone is interested (notice that I need to
require bordeaux-threads manually, which is probably a small
dependency bug ?). The first describe shows c=3, as expected, while
the second describe shows c unbound.

(require 'elephant)
(require 'bordeaux-threads)
(use-package 'elephant)

(defvar *store1* (open-store '(:BDB "store1")))
(defvar *store2* (open-store '(:BDB "store2")))
(Continue reading)

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Ian Eslick | 28 Sep 2011 02:19
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Reason for

Anyone remember why we put this into the elephant.asd file?  I think the goal was to force some action to take
place so that all the dynamic libraries were loaded each time.  It was causing the CCL MOP problem discussed
earlier.  I may have fixes for the CCL MOP - a few tests still fail which I will diagnose later.  

Part of the win is removing the following line from elephant.asd, but I'm sure I'm casing a regression
against another use case this was intended to handle.

(defmethod operation-done-p ((o load-op) (c elephant-c-source))
  nil)

Thank you,
Ian
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Arnaud Betremieux | 20 Sep 2011 09:46

Multiple store controllers, with each its own set of classes

Hi all,

I'm trying to use two (BDB) store controllers, each with its own set of
persistent classes. The reason is that I want to be able to modify the
secondary store outside the application (it's read-only within it) and
just plug-in a modified version (close-store, change directory,
open-store) at some point without affecting the rest of the data.

If I just use a let binding to set *store-controller* to the secondary
store around make-instance and get-instances-by-class, everything works,
except I can see the class index is stored in the main store-controller,
which is not good, as I want the secondary store to be independant.

If I set the global *store-controller* to the secondary controller after
having opened both, and even close the first one to make sure before I
call defpclass or any other elephant function, the class index is created
in the right store-controller this time, but I get a new one each time I
open the store (empty btree with a new oid).

I have tried understanding and tracing the related parts of code, but that
part is not exactly easy to dive in for an elephant noob, so I was hoping
that someone familiar with the code could explain what's happening, or
that someone would have a trick for using multiple store controllers in
this fashion.

Thanks a lot,
Arnaud
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Alex Mizrahi | 14 Sep 2011 16:39
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status update

Recent patches:

  * set-valued slot tests, optimized postmodern support
  * test-slot-sets enabled in asd

   test-slot-sets thoroughly verifies current behaviour (rather weird)
   optimized postmodern support uses pm-pset for backend storage which 
keeps everything in one btree (database table)

  * disabled testconditions
  * fixes FINISHES macro in tests
  * prevent loading same foreign library (and stuff which "depends" on it)
  * with-interrupts for db-postmodern
  * pm-cursor typo fixed
  * import class-direct-subclasses

Current status: two tests fail both on SBCL 1.0.16 and CCL 1.7:

1. ELEPHANT-DB-PATH-TEST -- as I understand, both tests and function 
ELEPHANT-DB-PATH are buggy as test comments do not quite match 
function's behaviour. I do not quite get how it was supposed to work, so 
I'll leave it as it is for now. I don't quite get why we got this 
failure only now, perhaps reshuffling enabled tests which were not run 
previously (problems from migration to fiveam)

2. CACHING-STYLE-REQUIRED -- I guess some MOP code which handles option 
inheritance is broken (or does not exist).

INHIBIT-ROLLBACK test in testconditions crashes both CCL and SBCL, as 
I've mentioned previously, but I've disabled it for now. (I have no idea
(Continue reading)

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Alex Mizrahi | 14 Sep 2011 14:30
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bugs in tests

It turns out that for compatibility with RT deftest we redefine 
5am:finishes (not shadowing it) into something which is supposed to work 
with deftest -- it returns NIL if there was error and T otherwise.
There are three problems with it:

1. if `finishes` is in a middle of deftest its output is ignored, i.e. 
it is OK even if there was an ERROR.
2. it just doesn't work in 5am:test, even if you spelled it 5am:finishes
3. And the worst part is that it eats CONDITION as if test was 
successful. And there are conditions which are worse than errors: memory 
corruption, etc.

And this is what happened with inhibit-rollback test -- it crashes CCL 
and makes SBCL signaling memory error.

Besides that, it turns out that cached-test-inherit-ok part of 
caching-style-required did not work, i.e. :cache-style is not inherited.
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Alex Mizrahi | 12 Sep 2011 17:26
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set-valued slots review

I. RATIONALE

There is a number of cases where one might want to store more than one 
value in a slot. An example from our testassociations: person can hold 
multiple jobs, job can have multiple holders.

There is a number of ways how you can hold these multiple values in a 
single slot:

1. Lisp collection like list or array. It is serialized as a whole, so 
you need to be careful to update slot after manipulations. If there are 
many items and list is frequently updated it is less than perfect.
2. Associations: it is, perhaps, ideal when you have relationship 
between classes. (I'll cover it in another message.)
3. pset (or btree): just assign pset instance to slot, then use pset API 
functions on it.
4. New slot-valued slot feature.

So how what is it? It is very similar to storing pset in a slot, and in 
fact it is implemented as a pset under the hood, with a number of 
differences:

1. There are convenience macros like set-insert and set-remove which 
combine slot-value with pset function. But you can use them on 
pset-in-a-slot too, so it is not really a difference.

2. On-demand ("lazy") initialization -- object is created with an 
unbound slot and it is created on first access. So it can save space 
(and time) if set is empty.
(Continue reading)

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Alex Mizrahi | 9 Sep 2011 12:23
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CL implementation support

It looks like something weird happens with CCL's CLOS when we load 
Elephant. Given that we have openmcl-mop-patches.lisp, it might be that 
we break something with out patches. Or something...

Is anybody interested in Elephant on CCL? Or other CL implementations?

If not, it will be SBCL-only until somebody enthusiastic enough comes 
and fixes problems.
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Alex Mizrahi | 6 Sep 2011 12:34
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Are there any postmodern backend users here?

I would like to discuss handling of types, i.e. integer/string keys 
which support range queries (and work faster).

There is a couple of options for handling type mismatches, I want to 
consider possible applications.
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Gmane